Width, height, and ratio math for print, photo, video, and social — 1:1 to 21:9 presets plus custom.
Width × Height
1,920 × 1,080
Ratio
16.00 : 9.00
Decimal ratio
1.7778
Enter a width and a ratio to get the matching height — or enter both dimensions to simplify the ratio (using GCD). Useful for printing, web layouts, photo crops, and fitting content to social media specs without letterboxing.
height = width × (ratio_b ÷ ratio_a)