Utility Tools
Age, date, GPA, converters and everyday tools
177 calculators in this category
Age Calculator
How old are you exactly? Enter your birthday to see your precise age in years, months, weeks, days, and hours. Handles leap years and month differences.
Date Calculator
Calculate the exact number of days between two dates, or add and subtract days from any date. Shows the breakdown in weeks, months, and business days.
GPA Calculator
Add your courses, credit hours, and letter grades to calculate your cumulative GPA. Supports weighted and unweighted scales with plus/minus grade points.
Unit Converter
Convert between units of length, weight, volume, temperature, area, and speed. Supports metric, imperial, and international measurement systems instantly.
Time Calculator
Add or subtract hours and minutes, or find the exact duration between two times. Handles overnight spans, multi-day calculations, and payroll tracking.
Password Generator
Generate strong, secure passwords with customizable length and character types. Includes strength indicator and entropy calculation for maximum security.
Random Number Generator
Generate random numbers within any range. Set min, max, and quantity — supports dice rolls, lottery picks, and unique or repeatable number sets instantly.
Grade Calculator
Calculate your weighted average, find the final exam grade you need, and track semester GPA. Enter assignments with weights to see your current class grade.
Countdown Calculator
Set a target date and watch the real-time countdown in days, hours, minutes, and seconds. Track holidays, birthdays, deadlines, and personal milestones.
Days Until Calculator
How many days until your event? Enter any future date to see the exact countdown in days, weeks, and months — covers holidays, birthdays, and deadlines.
Wedding Budget Calculator
Enter your guest count, region, and venue type to get a wedding budget breakdown by category. Shows per-guest cost, vendor tips, and contingency amounts.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and CM for men, women, and children. Enter any size or foot length measurement to see all international equivalents.
Ring Size Calculator
Find your ring size using finger circumference or diameter. Convert between US, EU, UK, and international ring sizing systems with our accurate calculator.
Curtain Fabric Calculator
How much fabric do you need for curtains? Enter your window width, curtain length, and fullness to get the exact yardage, panel count, and hem allowances.
Moving Box Calculator — Box Estimates
How many moving boxes do you need? Enter your home size and packing style for a personalized estimate of boxes, tape, bubble wrap, and total supply cost.
Storage Unit Calculator — Right Size Guide
What size storage unit do you need? Enter your home size and belongings to get a unit recommendation with monthly cost estimates and capacity breakdown.
Electricity Cost Calculator
Enter an appliance's wattage, daily usage hours, and your electricity rate to see daily, monthly, and yearly running costs in dollars and kilowatt-hours.
Screen Size Calculator
Find your screen's PPI, physical dimensions, and aspect ratio. Enter diagonal size and resolution to compare monitors, laptops, TVs, and phone displays.
AI Cost Calculator — API Pricing Estimator
Calculate and compare AI API costs for GPT-4o, Claude, and Gemini. Estimate per-request, daily, and monthly expenses based on your token usage patterns.
Carbon Footprint Calculator — CO₂ Emissions
Calculate your personal carbon footprint from driving, flying, home energy, and diet. Compare to US and global averages and find ways to reduce emissions.
Wedding Budget Wizard - Step-by-Step Wedding Cost Planner
Plan your wedding budget step by step with our free wizard. Estimate venue, catering, vendor, and extra costs based on guest count, region, and style.
Moving Cost Estimator — Calculate Your Move
Estimate your total moving cost based on distance, home size, services, and timing. Compare professional movers vs DIY for local and long-distance moves.
Knot Strength Calculator
Calculate how different knots reduce rope breaking strength. Enter rope specs and knot type to find effective strength, working load limit, and safety margins.
Generator Sizing Calculator — Home Backup
Calculate the right generator size for your home. Select appliances to find running watts, peak surge, and recommended portable or standby generator size.
Depth of Field Calculator
Calculate depth of field, hyperfocal distance, and near/far focus limits for any camera. Enter focal length, aperture, and subject distance for any sensor size.
Party Food Calculator - How Much Food to Buy for a Party
Calculate exactly how much food to buy for your party. Get a shopping list with quantities for appetizers, proteins, sides, and desserts by guest count.
Aspect Ratio Calculator — Resize Images & Video
Calculate aspect ratios, resize images proportionally, and find matching resolutions for any width and height. Free tool for video, photo, and social media.
TV Viewing Distance Calculator — Optimal Screen Size Guide
Calculate the perfect TV viewing distance or ideal screen size for your room. Compare 720p, 1080p, 4K, and 8K setups with THX-standard angle guidelines.
Noise Level Calculator — Combine Decibels & Check OSHA Limits
Calculate combined noise levels from multiple sources, check OSHA and NIOSH exposure limits, and find safe distances. Free online decibel addition tool.
Cost Per Wear Calculator — Find the True Value of Your Clothes
Calculate the true cost per wear for clothing and fashion items. Compare against fast fashion benchmarks and find out if that wardrobe splurge is worth it.
Price Per Unit Calculator — Compare Products & Find the Best Deal
Compare unit prices between 2–6 products to find the best value. Supports weight, volume, and count units with automatic conversion. Free and instant.
Bandwidth Calculator — Download Time, Streaming & Unit Converter
Calculate file download times, streaming bandwidth needs, and convert between Mbps, MB/s, Gbps, and Kbps. Find how much internet speed you actually need.
Color Converter Calculator — HEX, RGB & HSL with Preview
Convert colors between HEX, RGB, and HSL formats instantly. Preview live swatches, find complementary and triadic harmonies, and copy CSS code snippets.
Dimensional Weight Calculator — DIM Weight for Shipping
Calculate dimensional (DIM) weight and billable weight for UPS, FedEx, USPS, and DHL. Compare carriers side by side to find the cheapest shipping option.
DPI & PPI Calculator — Pixels, Print Size & Screen Density
Calculate DPI, PPI, and print size from pixel dimensions. Convert between screen density and print resolution for photography, graphic design, and web images.
Image File Size Calculator — Estimate Photo Size by Format & Resolution
Estimate image file sizes for JPEG, PNG, WebP, AVIF, RAW, and TIFF formats. Compare formats, calculate storage needs, and find upload times for photos.
Reading Time Calculator — Estimate Reading & Speaking Duration
Calculate reading time from word count or pasted text. Adjust for content difficulty, reading speed, speaking pace, and get audiobook duration estimates.
Rug Size Calculator — Find the Perfect Rug for Any Room
Find the right rug size for your room by dimensions, furniture layout, and room type. Get standard size recommendations with cost estimates by material.
Internet Speed Calculator — How Much Bandwidth Do You Need?
Calculate the exact internet speed your household needs based on streaming, gaming, video calls, and device count. Compare your current plan and savings.
QR Code Size Calculator — Minimum Print Size & Scan Distance
Calculate the minimum QR code print size based on scan distance, content length, and error correction level. Free online sizing tool for designers and print.
Typing Speed Calculator
Test your typing speed with a real-time WPM calculator. Measures words per minute, accuracy, and errors with character-by-character highlighting and ranking.
File Transfer Time Calculator — Speed & Duration Estimator
Calculate exact file transfer time for any file size and network speed. Compare WiFi, Ethernet, USB, and Thunderbolt transfers with protocol overhead.
TV Mounting Height Calculator — Optimal Placement Guide
Calculate the ideal TV wall mount height based on screen size, seating position, and eye level. Get optimal viewing distance, tilt angle, and placement.
WiFi Coverage Calculator
Estimate your WiFi router coverage radius and signal strength through walls and floors. Calculate how many access points you need for full home coverage.
Projector Throw Distance Calculator — Screen Size & Brightness Guide
Calculate projector throw distance, screen dimensions, and ft-Lamberts brightness for any throw ratio. Compare ultra-short, short, and standard throw setups.
Color Temperature Calculator
Color temperature calculator converts Kelvin to RGB for photography white balance and lighting design. Compare warm vs cool light sources on the Kelvin scale.
Etsy Fee Calculator
Calculate Etsy seller fees for 2026 including listing, transaction, and payment processing charges. See your profit margin and detailed fee breakdown per item.
Christmas Lights Calculator
Calculate how many Christmas lights you need for trees, rooflines, bushes, and outdoor wraps. Get strand counts, power usage, and monthly electricity costs.
Backpack Weight Calculator
Calculate your hiking base weight, total pack weight, and worn weight. Optimize gear by category to hit ultralight, lightweight, or traditional targets.
Water Purification Calculator
Plan water purification for hiking and camping. Calculate total liters, treatment time, and cost by method: pump filter, UV, chemical tablets, or boiling.
Tent Size Calculator
Find the right tent size for your group. Enter number of people, camping style, gear storage needs, and pets to get recommended square footage and capacity.
LED Strip Calculator
Calculate LED strip power supply size, wattage, amperage, and monthly running cost. Enter strip length, type, and voltage to get a complete power plan.
Resistor Calculator
Read resistor color bands to get resistance value, or use Ohm's law to find the resistor you need. Supports 4-band codes with tolerance and min/max ranges.
Battery Life Calculator — Runtime from mAh & Device Draw
Calculate how long a battery will last from its mAh capacity and your device current draw. Covers Li-Ion, LiPo, NiMH, alkaline, and lead-acid chemistries.
Wire Ampacity Calculator — Gauge, Voltage Drop & Max Distance
Find the right wire gauge for your circuit. Enter current, voltage, and distance to calculate voltage drop percentage, ampacity rating, and max safe run length.
Wedding Seating Calculator — Tables, Chairs & Space Planner
Plan your wedding reception layout. Enter guest count, table type, and layout style to get exact table count, chair needs, and square footage requirements.
BPM Tap Tempo Calculator — Tap to Find Beats Per Minute
Tap a button to the beat and instantly find your BPM. Also shows milliseconds per beat, note durations, and tempo classification from Largo to Presto.
Setlist Timer Calculator — Total Set Duration from Song List
Build your setlist and see the total set duration instantly. Add songs with individual times, set transition gaps, and plan encores to hit your time slot.
Guitar String Tension Calculator — Tension by Gauge & Tuning
Calculate string tension in pounds and kilograms from gauge, scale length, and tuning frequency. Covers all AWG gauges from .008 to .056 wound strings.
Print Size Calculator — Max Photo Print by DPI & Megapixels
Find the maximum print size from your image resolution and DPI. Enter pixel dimensions to see print dimensions, megapixels, aspect ratio, and quality ratings.
Golden Hour Calculator — Sunrise, Sunset & Photography Timing
Find golden hour and blue hour times for any location and date. Enter latitude and date to see sunrise, sunset, and optimal photography windows instantly.
Cleaning Dilution Calculator — Solution Mixing Ratios & Volumes
Calculate how much concentrate and water to mix for any cleaning solution. Enter source and target concentrations to get exact ounces, tablespoons, and ratios.
Laundry Load Calculator — Load Count by Items & Washer Size
Count your laundry items and see how many washer loads you need. Calculates total weight from individual clothing items and compares to washer capacity.
Generator Fuel Consumption Calculator — GPH & Cost by Wattage
Calculate generator fuel consumption rate by wattage and load level. Get gallons per hour, total fuel cost, and runtime estimates by tank size for any fuel.
Pressure Washer PSI Calculator — GPM & PSI by Surface Type
Find the right PSI and GPM for pressure washing any surface type. Get nozzle tip recommendations, cleaning time estimates, and water usage for your project.
Air Compressor CFM Calculator — Size by Tool Requirements
Calculate air compressor CFM requirements by tool combination. Get recommended tank size, HP, and compressor type for your home shop or pro garage setup.
Ladder Height Calculator — Safe Ladder Size by Reach & Angle
Calculate the right ladder height for your task. Get safe angle setback distance, maximum working reach, and extension or step ladder size recommendations.
Cable Management Calculator — Tray Size & Ties by Cable Count
Calculate cable tray size, zip ties, and total cable length for structured cabling runs. Get tray width by cable type, count, pathway style, and NEC fill.
Off-Grid Water Calculator — Collection, Storage & Filtration
Size your off-grid water system: rainwater collection, storage tanks, filtration, and daily needs for people, livestock, and gardens. Plan for dry spells.
Homestead Land Calculator — Acreage by Family & Livestock
Calculate how many acres you need for a homestead based on family size, livestock, gardens, orchards, and self-sufficiency goals. Adjusted for climate zone.
Biogas Digester Calculator — Sizing, Output & Savings
Size a biogas digester by waste input and estimate daily gas output, cooking hours, and annual propane savings. Covers fixed dome, plug flow, and DIY.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law formulas. Enter any two known values to instantly solve for the other two with V=IR and P=IV.
Voltage Divider Calculator
Calculate output voltage from a resistor voltage divider. Enter Vin, R1, R2, and optional load resistance to get Vout, current, and power dissipation.
555 Timer Calculator
Calculate 555 timer IC frequency, duty cycle, and pulse timing from resistor and capacitor values. Supports astable oscillator and monostable one-shot modes.
LED Resistor Calculator
Find the right current-limiting resistor for your LED circuit. Enter supply voltage, forward voltage, and current to get the nearest E24 standard value.
Capacitor Calculator
Calculate RC time constant, charge time, energy stored, and series/parallel capacitor combinations. Enter R, C, and voltage for complete timing analysis.
Inductor Calculator
Calculate inductor value from coil dimensions, inductive reactance at any frequency, and energy stored. Solenoid formula with turns, diameter, and length.
Transformer Calculator
Calculate transformer turns ratio, secondary winding turns, and current from primary and secondary voltages. Includes VA sizing for transformer selection.
RC Filter Calculator
Design RC low-pass and high-pass filters. Calculate cutoff frequency from R and C values, or find the resistor needed for a target frequency. Shows -3dB point.
Heat Sink Calculator
Calculate required heat sink thermal resistance from power dissipation, ambient temperature, and max junction temperature. Uses thermal resistance chain.
Power Supply Calculator
Calculate the right power supply wattage for your system. Add components with voltage and current draw, set efficiency and headroom to get recommended PSU size.
Antenna Calculator
Calculate antenna length by frequency for dipole, quarter-wave, and Yagi-Uda designs. Includes element dimensions, wavelength, and band presets for ham radio.
PCB Trace Width Calculator
Calculate minimum PCB trace width using IPC-2221 standard. Enter current, temperature rise, copper weight, and layer to get trace width in mils and millimeters.
Speaker Crossover Design Calculator
Calculate speaker crossover capacitor and inductor values for Butterworth filters. Enter crossover frequency, driver impedance, and filter order (1st or 2nd).
Stepper Motor Calculator
Calculate stepper motor steps per revolution, microstepping resolution, step frequency, and estimated max RPM from step angle, voltage, and driver settings.
Servo Motor Calculator
Calculate servo motor torque requirements from load weight and arm length. Compare popular SG90, MG996R, and DS3218 servos with safety factor analysis.
Pulley Calculator
Calculate pulley mechanical advantage, belt length, speed ratio, and required effort force. Supports fixed, movable, compound, and belt drive systems.
Spring Calculator
Calculate compression spring rate, force, shear stress, and maximum deflection from wire diameter, coil diameter, number of active coils, and material.
Spur Gear Calculator
Calculate spur gear pitch diameter, tooth dimensions, gear ratio, center distance, and output torque from tooth count, module, and pressure angle value.
CNC Feed Rate Calculator
Calculate CNC milling feed rate, spindle RPM, and material removal rate from tool diameter, number of flutes, chip load, and surface speed by material.
Thread Tap Calculator
Find the correct tap drill size for UNC, UNF, and metric threads. Calculate the precise drill diameter from thread size, pitch, and thread percentage.
Solar Panel Tilt Calculator
Find the optimal solar panel tilt angle for your latitude and hemisphere. Compare fixed, seasonal, and adjustable mount options with energy gain estimates.
Solar Charge Controller Calculator
Size your solar charge controller by panel wattage, battery voltage, and controller type. Calculate amperage rating and maximum input voltage for MPPT or PWM.
Raspberry Pi Power Calculator
Calculate Raspberry Pi power supply requirements by model, peripherals, and CPU load. Find PSU amperage rating and battery backup runtime for any Pi project.
Arduino Power Calculator
Calculate Arduino power budget with board draw, sensors, actuators, and peripherals. Estimate battery life for portable projects with any Arduino or ESP board.
Dance Floor Calculator — Size by Guest Count & Dance Style
Calculate the right dance floor size for your event. Enter guest count, dance style, and participation rate to get dimensions, panels, and square footage.
Event Staffing Calculator — Staff Count by Guest Number
Calculate how many event staff you need. Enter guest count and service style to get waiter, bartender, busser, and captain counts with guest-to-staff ratios.
Wedding Timeline Calculator — Day-Of Schedule Builder
Build your complete wedding day timeline with ceremony, photos, cocktail hour, dinner, and reception events. Customizable scheduling start to send-off.
Table Linen Calculator — Tablecloth & Napkin Quantities
Calculate tablecloth sizes and napkin quantities for your event. Enter table count, shape, and overhang to get exact linen dimensions and cost estimates.
Invitation Count Calculator — RSVP Rate & Household Grouping
Calculate how many invitations to order based on target attendance, RSVP accept rate, and household grouping. Includes cost estimates by invitation style.
Event Lighting Calculator — String Lights, Uplights & Power Needs
Calculate event lighting needs by venue size and type. Get string light footage, uplight count, total wattage, and circuit requirements for any event.
Sound System Calculator — Speaker Wattage & Count by Venue
Calculate sound system wattage and speaker count for any event. Enter guest count, venue type, and event style to get complete PA sizing recommendations.
Photo Booth Calculator — Prints, Props & Sessions by Guest Count
Calculate photo booth supply needs for your event. Enter guest count, booth type, and duration to get session estimates, print counts, and prop quantities.
Graduation Party Calculator — Food, Drinks & Supplies by Guest Count
Plan your graduation party supplies by guest count. Calculate food amounts, drinks, plates, napkins, cake size, and balloon decorations for any event.
Baby Shower Calculator — Food, Favors & Games by Guest Count
Plan your baby shower supplies by guest count. Calculate food amounts, party favors, game prizes, themed decorations, and diaper cake needs for any shower.
Birthday Party Calculator — Food, Cake & Supplies by Guest Count
Plan a birthday party by guest count and age group. Calculate exact food amounts, cake size, drinks, plates, balloons, and goody bag costs for any party.
Rehearsal Dinner Calculator — Budget, Venue & Menu Planning
Plan your rehearsal dinner budget by guest count. Calculate per-head costs, venue space, drink totals, gratuity, and total budget by venue and service style.
Wedding Vendor Tip Calculator — How Much to Tip Each Vendor
Calculate wedding vendor tips by vendor type and service quality. Get recommended tip amounts for your photographer, DJ, caterer, florist, and planner.
Event Rental Calculator — Tables, Chairs & Linen Costs by Guest Count
Calculate event rental needs by guest count. Get exact table, chair, linen, and place setting quantities with detailed rental cost estimates instantly.
Event Power Calculator — Generator Sizing by Equipment Load
Calculate event power requirements and generator size. Add your equipment loads to get total wattage, amperage, circuit count, and generator recommendation.
Venue Capacity Calculator — Max Guests by Room Size & Layout
Calculate venue capacity by room dimensions and layout style. Get maximum guest count for banquet, theater, cocktail, classroom, and conference setups.
Event Parking Calculator — Parking Spaces by Guest Count & Carpool Rate
Calculate parking spaces needed for your event by guest count. Factor in carpooling rate, valet service, shuttle options, ADA requirements, and lot size.
Event Budget Calculator — Budget Breakdown by Category & Guest Count
Break down your event budget by category percentages and guest count. Get venue, catering, photography, entertainment, and decor allocation estimates.
Wedding Photography Calculator — Shot Count, Timeline & Storage Needs
Plan wedding photography coverage by event hours and style. Get estimated shot count, delivered photos, group shot list, storage needs, and edit time.
Ceremony Seating Calculator — Row Count, Chair Spacing & Aisle Width
Plan ceremony seating layout by guest count and chair style. Calculate exact row count, chair spacing, aisle width, and total floor area for any event.
Sleeping Bag Calculator
Find the right sleeping bag temperature rating for your trips. Factor in season, sleep style, altitude, and sleeping pad R-value for accurate recommendations.
Bear Canister Calculator
Calculate the right bear canister size for your backpacking trip. Enter group size, trip days, and meal style to find which canister fits your food volume.
Stove Fuel Calculator
Calculate backpacking stove fuel needs for your trip. Enter days, meals, stove type, altitude, and temperature to determine exact fuel amounts to pack.
Climbing Rope Calculator
Calculate fall factor and impact force for climbing. Enter route height, fall distance, rope length, and climber weight to analyze fall severity and safety.
Climbing Grade Converter Calculator
Convert climbing grades between YDS, French, UIAA, British, Australian, V-Scale, and Fontainebleau systems. Instant conversion for route and boulder grades.
Avalanche Risk Calculator
Assess avalanche risk based on slope angle, danger rating, aspect, terrain traps, snow conditions, and wind loading. Educational tool for backcountry awareness.
Kayak Paddle Length Calculator
Calculate your ideal kayak paddle length by height, kayak width, torso length, and stroke style. Low angle touring vs high angle performance paddle sizing.
Kayak Load Calculator
Calculate kayak weight capacity utilization. Enter paddler weight, gear, and supplies to check if your kayak can safely handle the load with a safety margin.
Wetsuit Thickness Calculator
Find the right wetsuit thickness for any water temperature. Get recommendations for surfing, diving, swimming, and kayaking with hood, glove, and boot advice.
Wind Chill Calculator
Calculate wind chill temperature and frostbite time using the NWS formula. Enter air temperature and wind speed to find the real feels-like temperature.
Heat Index Calculator
Calculate the heat index (feels-like temperature) using the NWS Rothfusz regression. Enter air temperature and humidity to assess heat danger and safety.
Dew Point Calculator
Calculate dew point temperature from air temperature and relative humidity using the Magnus formula. Get comfort level, wet bulb temp, and spread analysis.
Lightning Distance Calculator
Calculate how far away lightning struck from the flash-to-thunder delay. Get distance in miles and km, safety zone assessment, and storm arrival estimates.
Ski Binding DIN Setting Calculator
Calculate your ski binding DIN setting using ISO 11088 standards. Factors in weight, height, boot sole length, skier type, and age for safe release settings.
Ski Wax Temperature Calculator
Find the right ski wax type and color for current snow temperature, humidity, and conditions. Includes fluorocarbon level and iron temperature guidance.
Snowshoe Size Calculator
Calculate the right snowshoe size based on your total weight with gear, terrain type, and snow conditions. Complete sizing guide from 22-inch to 36-inch.
Fishing Line Calculator
Calculate recommended fishing line test weight, type, and diameter for your target species and technique. Mono, fluoro, and braid comparison included.
Bow Draw Weight Calculator
Calculate recommended bow draw weight by body size, experience level, archery purpose, and bow type. Covers compound, recurve, and longbow with holding weight.
Ammunition Ballistics Calculator
Calculate bullet drop, velocity, and kinetic energy at any range using ballistic coefficient and muzzle velocity. Includes .223 to .300 Win Mag presets.
Sunrise Sunset Calculator
Calculate sunrise, sunset, solar noon, day length, and golden hour times for any location and date. Uses NOAA solar position equations for accurate results.
Hammock Hang Calculator
Calculate optimal hammock hang angle, strap length, ridgeline, and sag by tree distance and hammock length. Achieve the perfect 30-degree flat lay hang.
Trekking Pole Length Calculator
Calculate your ideal trekking pole length based on height and terrain type. Covers flat, uphill, and downhill adjustments with adjustable range sizing.
Guitar Tuning Calculator — Frequency & String Tension by Tuning
Calculate guitar string frequencies and tension for any tuning. Choose standard, drop D, open G, or custom tunings with your preferred gauge and scale.
Piano Tuning Calculator — Equal Temperament Frequency Table
Generate an equal temperament frequency table for piano tuning. Set your A4 reference pitch, choose a note range, and see the exact Hz value for every key.
Audio Delay Calculator — BPM to Milliseconds for Delay & Echo
Convert BPM to delay times in milliseconds. See straight, dotted, and triplet delay values for every note division from whole notes to thirty-second notes.
Room Acoustics Calculator — RT60 Reverb Time (Sabine Formula)
Calculate room reverberation time RT60 using the Sabine formula. Enter room dimensions and surface materials to see absorption, room modes, and advice.
Vinyl Record Calculator — Play Time by RPM, Size & Groove Spacing
Calculate vinyl record play time from RPM, disc size, and groove spacing. See total revolutions, groove length, and per-side duration for LPs, 45s, and 78s.
Speaker Power Calculator — Watts Needed by Room Size & SPL Target
Calculate how many watts your speakers need for a room. Enter room size, listener distance, sensitivity, and target SPL to find the right amplifier power.
Exposure Calculator — Aperture, Shutter Speed & ISO Triangle
Calculate exposure value from aperture, shutter speed, and ISO. See EV, light level classification, and equivalent exposure settings for any scenario.
Hyperfocal Distance Calculator — Maximum Depth of Field for Any Lens
Calculate hyperfocal distance and depth of field for any lens. Enter focal length, aperture, and sensor size to find where to focus for maximum sharpness.
Studio Lighting Calculator — Flash Power & Guide Number for Any Setup
Calculate studio flash power needed for your setup. Enter target f-stop, ISO, distance, and modifier to find required watt-seconds and guide number instantly.
Green Screen Calculator — Backdrop Size & Distance by Shot Type
Calculate green screen size, lighting placement, and room depth for your shoot. Choose shot type, camera distance, and focal length for proper chroma key setup.
ND Filter Calculator — Shutter Speed with Any Neutral Density Filter
Calculate new shutter speed when using ND filters. Select base exposure and filter strength to see the resulting shutter time, from ND2 to ND32768 (15 stops).
Time-Lapse Calculator — Interval, Frames, Clip Duration & Storage
Plan your time-lapse shoot with precise math. Enter shooting interval and duration to see total frames, final clip length, storage needs, and battery life.
Panorama Calculator — Shots Needed, Overlap & Final Resolution
Calculate how many shots you need for a panorama. Enter focal length, sensor size, total angle, and overlap percentage to plan your panoramic photography.
Video Frame Rate Calculator — Slow Motion, Shutter Angle & File Size
Calculate slow-motion factor, shutter speed, and file size for any frame rate. Enter shoot and playback FPS to plan slow-motion video and storage needs.
Cable Signal Distance Calculator — Max Length by Cable Type & Resolution
Check maximum cable run distance for HDMI, DisplayPort, USB-C, Ethernet, and coax. Enter your cable length to see which resolutions and speeds are supported.
Key Transpose Calculator
Transpose musical keys and chords by semitones instantly. Find capo positions, convert Nashville numbers, and shift songs to any key for guitar or piano.
Sample Rate Calculator
Calculate uncompressed audio file size from sample rate, bit depth, channels, and duration. Find the Nyquist frequency and compare WAV bitrate settings.
Reverb Time Calculator
Calculate room reverberation time (RT60) using the Sabine equation. Enter your room dimensions and surface materials to find acoustic decay and pre-delay.
Tempo & Delay Calculator
Calculate delay times in milliseconds from BPM. Get quarter, eighth, dotted, and triplet note values for perfectly synced delay, reverb, and modulation.
Frequency to Note Calculator — Hz to Musical Note & Cents
Convert any frequency to its nearest musical note with cents deviation. Supports custom A4 tuning from 432 to 443 Hz. Free MIDI note and pitch calculator.
Vinyl RPM Calculator — Play Time, Groove Spacing & Velocity
Calculate vinyl record play time, groove spacing, and linear velocity from RPM, record diameter, and groove density. Free turntable speed and LPI tool.
Studio Monitor Placement Calculator — Speaker Position & Room Modes
Find optimal studio monitor placement with equilateral triangle positioning, wall distances, and room mode analysis. Free speaker setup and acoustics tool.
Loudness Penalty Calculator
Check how Spotify, Apple Music, and YouTube will turn down your master. Enter your integrated LUFS and true peak to see the loudness penalty per platform.
Mix Headroom Calculator
Calculate the headroom needed for your mix based on track count and peak levels. Get per-track gain staging targets for clean, distortion-free mixes at -6 dBFS.
Song Royalty Calculator
Estimate your streaming royalties from Spotify, Apple Music, and Tidal. Enter stream count, per-play rate, and writer/artist/label splits to see earnings.
Chord Progression Calculator
Build chord progressions in any key with Roman numeral analysis, Nashville number system, and tension mapping. Transpose chords instantly for songwriting.
Music Practice Calculator
Plan structured music practice sessions with the 40/20/30/10 time split across technique, scales, repertoire, and sight reading. Track weekly practice hours.
Vocal Range Calculator
Find your voice type by entering your lowest and highest singable notes. Get bass, baritone, tenor, alto, or soprano classification with range analysis.
Impedance Matching Calculator
Calculate total speaker impedance for parallel and series wiring. Find load mismatch ratio, damping factor, and power distribution across all speakers.
Microphone Distance Calculator
Calculate critical distance for microphone placement. Find direct-to-reverberant ratio, proximity effect, inverse square law SPL drop, and 3:1 spacing.
Stage Plot Calculator
Plan your live stage setup with mic input counts, DI boxes, monitor wedges, power circuits, and cable estimates. Build a complete input list for any band.
Feedback Frequency Calculator
Calculate room mode frequencies from standing waves. Find problem feedback frequencies, notch filter Q values, and musical note equivalents for any room.
Decibel Addition Calculator
Add decibel levels from multiple sound sources using logarithmic dB addition. Calculate combined SPL, distance attenuation, and OSHA/NIOSH noise dose.
Audio Bitrate Calculator
Calculate audio file size from bitrate and duration. Compare lossy MP3/AAC vs lossless FLAC/WAV formats and see how many songs fit on your storage device.
Speaker Wire Gauge Calculator
Find the right AWG speaker wire gauge for your audio setup. Calculate power loss percentage from wire run length, speaker impedance, and amplifier wattage.
DJ Set BPM Calculator
Plan your DJ set with BPM ranges per segment, pitch adjustment percentages, and Camelot wheel harmonic mixing. Check key compatibility for smooth transitions.
PA System Calculator
Calculate PA system wattage for your audience size and venue. Find required SPL, amplifier power per speaker, and distance loss using the inverse square law.
Cable Length Signal Loss Calculator
Calculate audio cable signal loss by length and type. Compare XLR, TRS, RCA, and coaxial attenuation at different frequencies to find maximum cable run lengths.
Subwoofer Frequency Calculator
Calculate subwoofer enclosure tuning frequency, port length, and sealed box F3 cutoff using Thiele-Small parameters. Supports sealed and ported designs.
Acoustic Treatment Calculator
Calculate how many acoustic panels you need for your room. Enter dimensions, wall surface, and target RT60 to get panel count, coverage area, and cost estimate.