Skip to content
Black White Red Green Blue Yellow Orange Purple Pink Gray
Pixel & Color Dead Pixel Test Stuck Pixel Fixer Greyscale & Banding Test Backlight Bleed Test Contrast & Brightness Test
Motion & Refresh Refresh Rate Test Ghosting & Response Time Test Screen Flicker Test
Display Info Screen Resolution Checker Viewport Size Checker
Touch & OLED Touch Screen Test OLED Burn-in Test
Calculators PPI Calculator Aspect Ratio Calculator Screen Size Calculator
Monitor Test, all tests in one launcher View all tools

PPI Calculator

  • Free
  • Runs in browser
  • No download
Pixels per inch
82 PPI

PPI = √(width² + height²) ÷ diagonal. A standard office monitor sits around 92–110 PPI. Phones are usually 300–460 PPI (Retina-class). 4K on a 27″ screen is about 163 PPI.

Found a problem? Compare top-rated monitors

Affiliate disclosure: we may earn a commission when you buy through links on this page, at no extra cost to you.

Product image
Best overall

LG 27UK850-W 27" 4K IPS USB-C

27" · 3840 × 2160 · 60 HzCheck price
Product image
Best for gaming

ASUS TUF Gaming VG27AQ 27" 1440p 165Hz IPS

27" · 2560 × 1440 · 165 HzCheck price
Product image
Best for creators

BenQ PD3220U 32" 4K Thunderbolt 3 IPS

32" · 3840 × 2160 · 60 HzCheck price

Related tools

All screen tests
Dead Pixel TestCycle solid colors to spot dead and stuck pixels.Run TestBacklight Bleed TestA dark screen shows light leaking at the edges.Run TestRefresh Rate TestMeasure the frame rate your browser draws at.Run TestScreen Resolution CheckerSee resolution, viewport and pixel ratio.Run Test

Related guides

PPI Calculator1 min readTips & Tricks7 Ways to Use a Full Black Screen (More Than Dead Pixel Tests)Most people discover a black screen tool when they need to test for dead pixels. But a full black screen has a surprising number…4 min readScreen TestsStuck Pixel Fix: How to Get Rid of a Stuck Pixel on Your ScreenDiscovering a coloured dot on your screen can feel like a disaster, but a stuck pixel is not the same as a dead pixel…4 min read