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Aspect ratio calculator

Find the aspect ratio of an image, video or screen, or the new height for a width while keeping the same shape.

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Aspect ratio 16 : 9

How it works

W : H = W ÷ gcd : H ÷ gcd · new H = new W × H ÷ W

Divide width and height by their greatest common divisor to get the simplest ratio: 1920 × 1080 → 16 : 9. To resize without stretching, keep the ratio: new height = new width × old height ÷ old width. Some sizes don’t reduce to a familiar ratio (1366 × 768 is 683 : 384, “about 16 : 9”), so the decimal form (1.78 : 1) is shown too.

  1. Greatest common divisor gcd(1,920, 1,080) = 120
  2. Divide both by it 1,920 ÷ 120 : 1,080 ÷ 120 = 16 : 9
  3. Keep the ratio for the new width 1,280 × 1,080 ÷ 1,920 = 720

Printed from rocketcalc.io/computing/aspect-ratio