UseCalcPro
Home
Math
Percentages, fractions, ratios
Finance
Loans, mortgages, investments
Health
BMI, calories, fitness metrics
Construction
Materials for building projects
Auto
Car payments, fuel, insurance
Pets
Pet age, feeding, housing
Garden
Lawn care, irrigation, compost
Crafts
Yarn, fabric, candle making
Food & Brewing
Bread, dough, brewing, recipes
Tools
Age, date, GPA, converters
Blog
  1. Home
  2. Tools

Screen Size Calculator

Calculate PPI, dimensions, and aspect ratio for any display

PPI

108.8

Aspect Ratio

16:9

Physical Size

23.5" x 13.2"

Screen Analysis

PPI
108.8
Sub-Retina
Aspect Ratio
16:9
Physical Size
23.5" x 13.2"
Area: 311.5 sq in
Viewing Dist.
32.4"
2.7 ft recommended
Total Pixels
3,686,400 (3.69 MP)

Physical Dimensions

Width23.5"
Height13.2"
16:9

Example Calculations

127" 1440p Monitor

Inputs

Diagonal27 inches
Resolution2560 × 1440

Result

PPI108.8
Aspect Ratio16:9
Physical Size23.5" × 13.2"
Viewing Distance32.4" (2.7 ft)

PPI = √(2560² + 1440²) / 27 = √(6553600 + 2073600) / 27 = 2939.4 / 27 = 108.8 PPI.

224" 4K Monitor

Inputs

Diagonal24 inches
Resolution3840 × 2160

Result

PPI183.6
Aspect Ratio16:9
Physical Size20.9" × 11.8"
Total Pixels8,294,400

PPI = √(3840² + 2160²) / 24 = √(14745600 + 4665600) / 24 = 4406.4 / 24 = 183.6 PPI.

Frequently Asked Questions

Q

What is PPI and why does it matter?

PPI (Pixels Per Inch) measures pixel density — how many pixels fit in one inch of screen. Higher PPI means sharper text and images. Generally, 100+ PPI is acceptable for monitors at desk distance, 200+ PPI is considered 'Retina' quality, and 300+ PPI is standard for smartphones.

Q

What is a good PPI for a monitor?

For a desktop monitor at typical viewing distance (2-3 feet), 90-110 PPI is standard (1080p on 24"), 110-140 PPI is sharp (1440p on 27"), and 160+ PPI is very sharp (4K on 27"). For laptops, 130-230 PPI is common. The ideal PPI depends on how close you sit to the screen.

Q

How is aspect ratio calculated?

Aspect ratio is the proportional relationship between width and height. Divide both the width and height resolution by their greatest common divisor (GCD). For example, 1920×1080 has a GCD of 120, giving 16:9. Common ratios: 16:9 (widescreen), 16:10 (productivity), 21:9 (ultrawide), 32:9 (super ultrawide).

Q

What is the recommended viewing distance?

A general rule is 1.2× the screen diagonal for desktop monitors. For a 27" monitor, sit about 32" (2.7 feet) away. For TVs, the recommendation is 1.5-2.5× the diagonal. These distances ensure you can see the full screen without excessive eye movement.

Q

Does higher resolution always mean better?

Not necessarily. A 4K resolution (3840×2160) on a 24" monitor gives extremely high PPI, but text and UI elements may appear very small without scaling. The ideal resolution depends on screen size, viewing distance, GPU power, and personal preference.

Related Calculators

Unit Converter

Convert between measurement units

Area Calculator

Calculate areas of various shapes

Rectangle Calculator

Calculate rectangle properties

Percentage Calculator

Calculate percentages quickly

More Utility Tools

Other everyday calculators

View All

Last Updated: Feb 12, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

UseCalcPro
FinanceHealthMath

© 2026 UseCalcPro