Aspect Ratio Calculator
Find the aspect ratio of any width×height and compute matching dimensions when you resize — built for designers, streamers and video editors.
Aspect ratio
16:9
Decimal (w÷h)
1.7778
Matching height
720 px
Formula
ratio = width ÷ height (simplified by GCD)How to use the Aspect Ratio Calculator
- 1Enter original width and height
- 2Enter a new width or height to scale
- 3Read the simplified ratio and new dimensions
Frequently Asked Questions
What aspect ratio is 1920×1080?
16:9 — the standard for HD/Full HD video, YouTube and most monitors.
What is 21:9 used for?
Ultrawide monitors and anamorphic cinema. 2560×1080 and 3440×1440 are common 21:9 resolutions.