Aspect Ratio Calculator
Get any image or screen's aspect ratio in reduced form with common-ratio matching — 16:9, 4:3, 1:1 and custom. Check a 1920×1080 screen reads 16:9 — free, runs locally.
How to Use the Aspect Ratio Calculator
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Frequently Asked Questions
What is the ratio of 1920×1080?
16:9 — divide both by their GCD (120). The tool reduces any dimension pair; 1080×1080 gives 1:1, 1200×800 gives 3:2.
How do I resize without stretching?
Lock the ratio by hand: a 4000×3000 photo (4:3) at 1920 wide must be 1440 tall (1920 × 3 ÷ 4). This tool reduces ratios — it has no target-size solver, so compute the matching side yourself.
Which ratio for YouTube vs Reels?
16:9 landscape for YouTube, 9:16 vertical for Reels and Shorts, 1:1 for feed posts. Reduce the dimension pair here to confirm the ratio before opening the editor.
Do my dimensions leave the browser?
No — math runs locally in your browser. Dimensions never leave your device.
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Last updated October 2026