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

Mode

Width (px)

Height (px)

New Width (px) — for scaling

Aspect Ratio

Scaled Height

Common Name

📺 Level up your video setup

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.

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.