Aspect Ratio Calculator — Resize & Scale
Calculate aspect ratios, resize dimensions proportionally, and find equivalent sizes. Free online calculator for designers.
Aspect Ratio
16:9
Decimal: 1.7778
Scale to New Size
Scaled size: 1280 × 720
Common Ratios
What is Aspect Ratio?
Aspect ratio is the proportional relationship between width and height. It is expressed as two numbers separated by a colon (e.g., 16:9). Maintaining aspect ratio when resizing prevents images and videos from being stretched or distorted.
Common Aspect Ratios
16:9 is standard for HD video and monitors. 4:3 is the classic TV/monitor format. 1:1 is square (Instagram posts). 9:16 is vertical (Stories, Reels, TikTok). 21:9 is ultra-wide cinema format.