Aspect Ratio Calculator
Type a width and a height to get the simplest ratio and the closest standard one, or type a ratio and one side to find the other.
Resize keeping the ratio
How to use it
- Type the width and height in pixels or any unit.
- Read the reduced ratio and the closest standard ratio.
- To resize, type a new width or height and get the other side.
Frequently asked questions
What is an aspect ratio?
It is the proportion between width and height, written as width:height. HD and 4K screens are 16:9 (1920×1080, 3840×2160), old TVs and many tablets 4:3, and most photos 3:2 or 4:3.
Why is 1366×768 not exactly 16:9?
Reduced exactly it is 683:384, about 1.779, very close to 16:9 (1.778). Screens like this are sold as 16:9, so the calculator also shows the closest standard ratio.
Which ratio should I use for videos?
Use 16:9 for YouTube and TV, 9:16 for vertical video such as Stories, Reels, TikTok and Shorts, and 1:1 for square posts.
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