Aspect Ratio Calculator
Compute the aspect ratio of any dimensions and resize while keeping the ratio.
Compute ratio
Ratio: 16 : 9
Resize (keep ratio)
New height: 720
Keeps ratio 16 : 9
Common:
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Resize an image or video and you need the new height that keeps the proportions, or the ratio a given size works out to. Enter a width and height to get the aspect ratio, or lock the ratio and solve for a missing dimension without squashing the picture.
How to use: Aspect Ratio
- 1Enter inputEnter width and height.
- 2Set optionsRead the simplified ratio.
- 3ProcessEnter a new width to resize.
- 4Get resultUse the presets for common sizes.
Common use cases
Resize without distortionFind the matching height for a new width so nothing stretches.
Identify a ratioSee whether a size is 16:9, 4:3, 1:1 or something else.
Plan a video exportGet dimensions that fit a target ratio for a platform.
Fit a print or frameWork out a size that keeps the ratio for a given frame.
Good to know
Lock the ratio to avoid stretchingChange width and height independently and the image distorts. Solve for one from the other to keep faces and circles true.
Common ratios have names16:9 is widescreen video, 4:3 is older screens, 1:1 is square, 9:16 is vertical for phones. Matching the platform avoids black bars or crops.
Ratio is not resolution1280 by 720 and 1920 by 1080 are both 16:9 but different sizes. The ratio sets the shape; the pixel count sets the detail.
Cropping changes the ratioResizing keeps the ratio; cropping changes it. If you must hit a new ratio, decide what to trim rather than stretch.