Utility Tools
Age, date, GPA, converters and everyday tools
20 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.