Aspect Ratio
Find dimensions from any ratio.
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About
Aspect Ratio calculates the missing dimension when you know a ratio and one side — enter a 1920px width at 16:9 and it gives you the height — or works backward from two dimensions to find the ratio itself. Common presets like 16:9, 4:3, 1:1, and 21:9 (plus portrait variants) are one click away, with a live rectangle preview showing the proportions visually. Runs entirely client-side.
Frequently asked
- Can it find the ratio from two dimensions, not just calculate a missing one?
- Yes, entering both width and height computes and simplifies the ratio between them, in addition to the reverse: ratio plus one side gives you the other side.
- Does it include common video and photo ratios as presets?
- Yes, 16:9, 4:3, 1:1, 3:2, 21:9, and their portrait equivalents are built in as one-click presets.