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Aspect Ratio Calculator

Find aspect ratio, width or height for images and displays. Free online Aspect Ratio Calculator for technology — instant, accurate results, no signup needed.

Aspect ratio
16:9
Scale to new size (fill one)
Result
1280 × 720.00

Derivation

  1. ├── 01Givenwidth = 1920, height = 1080
  2. ├── 02Formulaaspect ratio = W:H simplified by dividing both by gcd(W, H)
  3. ├── 03GCDgcd(1920, 1080) = 120
  4. ├── 04Simplify1920/120 : 1080/120
  5. ├── 05Aspect ratio16:9
  6. ├── 06Formulanew height = (original height × new width) / original width
  7. ├── 07Substitute(1080 × 1280) / 1920
  8. └── 08New height720.00
Did you know?

Ratios appear in the earliest Greek mathematics (Eudoxus, 4th century BCE) as a way to compare incommensurable lengths without a concept of irrational numbers.

§01What is

Understanding the Aspect Ratio Calculator

The Aspect Ratio Calculator helps you compute find aspect ratio, width or height for images and displays.. It runs entirely in your browser with no sign-up required.

Quick calculators for the math that shouldn’t need a notepad — instant, accurate, private to your browser. The Aspect Ratio Calculator sits in that toolkit — it find aspect ratio, width or height for images and displays. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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