Aspect Ratio Calculator
100% PrivateCalculatorsReduce any width and height to their simplest aspect ratio and find missing dimensions.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
16:9 (1.7778 : 1)
This is exactly the common 16:9 ratio.
Matching width at 16:9: 1,280.00 px
- 1Enter the current width and height.
- 2Read the simplified ratio and its decimal form.
- 3In the resize box, choose which new dimension you know and enter it to get the matching other dimension.
1920 and 1080 share a greatest common divisor of 120, so the ratio reduces to 16:9 (1.7778 : 1), matching the common-ratios list. At a new height of 720 the matching width is exactly 1280, the familiar 720p frame.
- The tool reports whether the reduced ratio exactly matches the common set (16:9, 4:3, 21:9, 1:1, 3:2, 9:16); near-misses like 1920 x 1030 are not 16:9 and are not claimed to be.
- For non-integer dimensions the ratio is computed at a precision of four decimal places before reducing.
- Resizing to the matching dimension prevents the stretching that happens when both dimensions are chosen independently.
Divide both sides by their greatest common divisor. For 1920 x 1080 the divisor is 120, giving 16:9.
About this tool
The Aspect Ratio Calculator reduces any width and height to their simplest ratio and works out the missing dimension when you resize. Video editors, designers and developers use it constantly: to check whether footage is truly 16:9, and to get the exact height for a new width without distortion.
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Part of Ovatly's free tools in Calculators.