🖼️ Image Tools
Aspect Ratio Calculator
Simplify an image ratio and calculate a proportional height for a new width.
Ready to use · Runs in your browser · No signup
At 1,280 px wide, proportional height is 720 px.
How to use the Aspect Ratio Calculator
Enter an original width and height to simplify the aspect ratio, then enter a new width to calculate the matching proportional height.
- Enter the original pixel width and height.
- Fieldlet reduces those dimensions using their greatest common divisor.
- Enter a target width to calculate the proportional height without stretching the ratio.
Last reviewed for accuracy:
Common questions
Why does proportional resizing matter?
Keeping the same ratio prevents an image or video from appearing stretched or squashed when its dimensions change.