Ratio solver with presets and the working shown, not just the answer

How to use

1. Enter the ratio (or tap a preset) plus one dimension.
2. Hit Solve — the missing W or H is computed with the formula shown.
3. Or enter both W and H to simplify to the truest ratio.

About this tool

Video editors, print designers and streamers hit this daily: you know one dimension and the ratio, and you need the other. Enter 16:9 and a width to get the exact height, enter a width and height to get the ratio simplified by greatest common divisor, or tap the presets for 16:9, 4:3, 1:1, 9:16, 21:9 and 3:2. The working is shown — the actual multiplication, not just the answer — so you can sanity-check every number before it reaches your timeline or print file. Everything calculates locally in your browser instantly; there is no server, no login and no tracking anywhere on this page. Everything runs locally in your browser — nothing is uploaded, nothing is sent to any server, and closing the tab erases it all.

FAQ

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