Aspect Ratio Calculator
Enter a width or height and get the matching dimension for any ratio.
px
px
Ratio
1920
1080
16:9
Drop an image to read its ratio
How it works
Pick a ratio, type a width or a height, and the matching dimension appears instantly. Lock the ratio to keep it fixed while you resize.
Frequently asked questions
The proportional relationship between an image’s width and height, written as W:H — for example 16:9.
Turn on lock ratio, then change either the width or the height. The other dimension updates instantly to match.
Yes. Drop an image onto the dropzone and RatioForge reads its pixel dimensions and simplifies the ratio.
Pixels, centimetres, inches and millimetres.