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Screen PPI Calculator

Unit Converters

Pixel density, dot pitch and Retina viewing distance

Quick Answer

Screen PPI Calculator: Pixel density, dot pitch and Retina viewing distance. Dot pitch = 25.4 ÷ PPI (mm).

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How to Use

  1. Pick units: switch source and target units in the Screen PPI Calculator.
  2. Enter a value: results sync both ways instantly — no convert button needed.
  3. Use the reference table: common conversions are listed for instant lookup.
  4. Copy the result: copy the converted value with its unit.

Key Points

  • Screen PPI Calculator is a free online unit conversion tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Pixel density, dot pitch and Retina viewing distance.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Pixel density

PPI = √(width² + height² px) ÷ diagonal inches

Dot pitch = 25.4 ÷ PPI (mm)
Reference: iPhone ≈ 460, 27" 4K ≈ 163, 27" 1440p ≈ 109, 24" 1080p ≈ 92

FAQ

How do I use the Screen PPI Calculator?
Open the page and fill in the input fields — results update automatically. Pixel density, dot pitch and Retina viewing distance.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on SI conversion factors and international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Screen PPI Calculator[EB/OL]. https://www.yijiansuan.com/en/c/convert/ppi

Results provided by this tool are for reference only and do not constitute professional advice.