About This Tool

An aspect ratio calculator for designers, video editors, and content creators. Resize proportionally, find common sizes, and understand aspect ratios.

100% Client-Side

All calculations happen in your browser. Nothing is transmitted to any server.

Features

• Calculate aspect ratio from any width and height
• Lock ratio and resize proportionally
• 8 common preset ratios (16:9, 4:3, 1:1, 21:9, 9:16, 3:2, 5:4, 2:1)
• Common pixel sizes at the current ratio
• Visual ratio preview box

Contact

Questions or feedback? Use the feedback link in the navigation.