Aspect Ratio Calculator
Resize dimensions proportionally: enter one side, get the other, ratio preserved.
Aspect ratio: 16:9 (1.7778)
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Common use cases
- Scaling a video or thumbnail to a platform's required dimensions without stretching
- Working out how tall a full-width hero image will render at a given breakpoint
- Converting between a ratio (16:9) and actual pixel dimensions for an export
- Checking what shape an unfamiliar resolution actually is (is 1366×768 really 16:9? — almost, not quite)
- Sizing embeds and iframes so they reserve the right space before loading
Why Aspect Ratio Calculator?
The math is one division — but it comes up twenty times a day in design and video work, and doing it in a head or a phone calculator invites the off-by-one that makes an export subtly squashed. This one shows the simplified ratio for any dimensions, carries the presets that actually come up (including the 1200×630 OG image and 2.35:1 cinema), and previews the shape so a transposed width/height is caught by eye. If the numbers lead to an actual resize job, the Image Resizer is one click away.