W:H
Aspect Ratio Calculator
Reduce a width and height to their aspect ratio, and find the missing side when you resize.
Result…
How it's calculated
Ratio = (W ÷ gcd) : (H ÷ gcd) New height = new width × H ÷ W
Divides both sides by their greatest common divisor to give the simplest whole-number ratio. Some common sizes reduce to odd-looking ratios (2560 × 1080 is 64:27, sold as "21:9"). Resizing keeps the ratio, so the other side is found by proportion.
Your numbers, step by step
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