Aspect Ratio Calculator
Enter width and height to get the ratio, then scale to a new size without distortion. Presets for every social format.
Type a resolution to see its aspect ratio as a fraction and a decimal, then enter a new width or height to get the matching other side. The presets cover what creators use most: 9:16 for Reels, TikTok and Shorts, 4:5 and 3:4 for Instagram posts, 16:9 for YouTube and 4K, 2.39:1 for a cinematic look.
How it works
- Enter width and height Or tap a preset.
- Read the ratio As a fraction (16:9) and a decimal (1.778).
- Scale it Type a new width or height, the other side is calculated.
FAQ
What aspect ratio is 1080×1920?
9:16, the vertical format for Reels, TikTok and YouTube Shorts.
What size is a 4:5 Instagram post?
1080×1350 pixels. The new 3:4 grid format is 1080×1440.
What is 2.39:1 in pixels?
For a 4K DCI width of 4096 it is 4096×1716; inside a UHD 3840 frame it is 3840×1607.
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