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Aspect Ratio Calculator

Calculate, maintain and convert aspect ratios for images, video and screen sizes.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed
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Aspect Ratio
Scaled Height
Common Name

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Common Aspect Ratios

16:9 is standard HD/UHD video. 4:3 is legacy TV/monitors. 1:1 is social media square. 9:16 is mobile video (TikTok, Reels). 21:9 is ultrawide cinema.

Why Aspect Ratio Matters

Frequently Asked Questions

What aspect ratio should I use for YouTube?+
YouTube recommends 16:9 (1920×1080 or 3840×2160 for 4K).
How do I resize an image without distortion?+
Lock the aspect ratio and only change one dimension — the other will update proportionally.

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