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16:9 → ratio 1.778. Width 1920 → height 1080.
Height = Width ÷ Aspect Ratio (W:H as decimal W/H)Vertical 9:16: height 1920 → width 1080.
Width = Height × Aspect RatioDivide both dimensions by greatest common divisor for clean ratio notation.
GCD simplification: 1920×1080 → 16:9Updated: July 2026
3840 width → 2160 height. Standard UHD delivery for YouTube and streaming.
1080 width → 1920 height. Full vertical HD for mobile-first content.
3840 × 1607 active pixels with letterbox bars to 2160 total height.
Compute video frame dimensions from any aspect ratio and one known side. Enter ratio (16:9, 4:3, 2.39:1, 9:16) plus width or height to get matching pixel dimensions for export, cropping, and social platform specs.