Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions.
Find Aspect Ratio
Aspect Ratio
Aspect Ratio Calculator — Ratios and Resizing, Done Right
Whether you are cropping a photo, sizing a video, or laying out a design, the aspect ratio has to stay locked. This free tool finds the simplified ratio of any width and height — 1920x1080 becomes 16:9 instantly.
Switch to resize mode and the calculator keeps your ratio while you change dimensions: type a new width and the matching height appears automatically.
Find any ratio
Enter width and height to get the simplified ratio — 16:9, 4:3, 1:1, 21:9, or whatever your numbers reduce to.
Resize with the ratio locked
In resize mode, changing the width auto-fills the correct height (and vice versa), so images never stretch or squash.
Two modes, one tab bar
The Find Ratio and Calculate New Dimensions modes sit side by side — flip between them without losing your numbers.
How to use
- Choose the Find Ratio or Calculate New Dimensions mode.
- Enter your width and height.
- Read the simplified ratio, or type a new width or height to get the matching dimension.
Frequently Asked Questions
What is an aspect ratio?
The proportional relationship between width and height, written like 16:9. It describes the shape of an image or screen regardless of its size.
How do I resize without distortion?
Use the Calculate New Dimensions mode: enter the original size, then type only the new width or height — the other field updates to preserve the ratio.
What is the aspect ratio of 1920x1080?
16:9 — the standard widescreen ratio used by most monitors and videos.
Is the aspect ratio calculator free?
Yes, free with no signup.
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