Aspect ratio calculator
Set a ratio and one dimension, and the other solves instantly to keep the shape. Pick a common preset like 16:9, 4:5 or 9:16, or type your own ratio.
1280 x 720 px at 16:9. Type in either field and the other solves to keep the ratio.
Common aspect ratios
- 16:9 widescreen video and YouTube thumbnails.
- 9:16 vertical video: Reels, Shorts, TikTok, Stories.
- 1:1 square posts and profile art.
- 4:5 Instagram portrait, the tallest single feed image.
- 2:3 Pinterest pins.
- 3:1 and 4:1 wide profile banners.
Frequently asked questions
How do I calculate an aspect ratio?
Divide the width by the height, then reduce the fraction. For example 1280 by 720 divides to 16 by 9, so the ratio is 16:9. The calculator does this and solves for any missing value.
What is the 16:9 equivalent of a height?
Multiply the height by 16 and divide by 9. For a 720 pixel height that is 1280 pixels wide. Enter the height in the calculator and it fills the width for you.
What aspect ratio is a vertical video?
Vertical video for Reels, Shorts, TikTok and Stories is 9:16, which is 1080 by 1920 pixels.
Read the full aspect ratio guide for where each ratio is used.