Aspect Ratio Calculator
Calculate matching dimensions for any ratio. Free, no signup.
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How It Works
Set the aspect ratio (e.g. 16:9) and enter a width. The matching height is calculated instantly. Use the preset buttons for common ratios. Useful for sizing images, videos, banners, and responsive layouts.
Common Aspect Ratios
16:9 — standard widescreen (1920x1080, 1280x720). 4:3 — classic TV and iPad. 1:1 — square, used for profile pictures and Instagram. 21:9 — ultrawide monitors. 9:16 — vertical video (TikTok, Reels, Stories).