Aspect Ratio Calculator
An aspect ratio compares width to height. Two pictures can be different sizes and still share the same shape, and this shows that shape as one number. Most video is wider than it is tall, for example.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Divide the width by the height. A ratio above 1 means wider than tall, and a ratio below 1 means taller than wide.
To resize while keeping the same shape, multiply the new width by the height and divide by the old width. Both sides change by the same amount, so nothing gets stretched.
Worked example
A picture 1,920 wide and 1,080 tall has a ratio of 1.78 to 1. At 1,280 wide, it should be 720 tall to keep its shape.
Questions
Why does my photo look stretched?
Usually the width and height were changed separately. Keep the ratio the same by working out the matching height first.
Is a ratio of 1 a square?
Yes. Equal width and height make a square, and the ratio is 1.
Does this change the picture?
No. It only works out numbers. Your picture changes when you resize it in your editor.
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