Aspect Ratio Calculator
Last updated: June 1, 2026Resize keeping the same ratio.
Aspect Ratio Calculator is a free online calculator to resize keeping the same ratio. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Aspect Ratio Calculator
The Aspect Ratio Calculator finds the simplified ratio of any dimensions and calculates a new width or height that keeps the same ratio, with no distortion. Ideal for resizing images, video and screens. Free and runs in your browser.
- 1Enter your original width and height.
- 2See the simplified aspect ratio.
- 3Enter a new width to get the matching height.
No distortion
Find the exact height (or width) that preserves the ratio.
Simplified ratio
See ratios like 16:9 from any dimensions.
Free & private
Runs on your device with no sign-up.
Aspect Ratio Calculator — frequently asked questions
How do I keep the aspect ratio when resizing?
Enter the original size, then a new width — the tool calculates the height that keeps the same ratio so the image isn't stretched.
What aspect ratio is 1920x1080?
16:9 — the standard widescreen ratio. The tool simplifies any dimensions for you.
Is it free?
Yes, completely free.
Share this tool
Send it to someone who needs it or save the link for later.
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