📐 Aspect Ratio Calculator
Resize without distortion — any platform.
Proportional height
1080 × 1920
Reels / TikTok / Stories — 1080×1920
What is the aspect ratio calculator?
Aspect ratio is the proportional relationship between width and height (e.g. 9:16 for Stories/Reels, 1:1 for feed squares, 16:9 for YouTube). Keeping the ratio fixed lets you resize media without stretching it.
How to use it
- 1Choose or enter a target aspect ratio.
- 2Enter a known width or height.
- 3Read the matching dimension and common platform presets.
FAQ
What aspect ratio is best for Reels and TikTok?
9:16 (vertical full-screen), commonly 1080×1920 pixels.
What ratio should a YouTube thumbnail be?
16:9, ideally 1280×720 pixels.
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