Free Online Aspect Ratio Calculator & Image Dimension Tool

Instantly calculate pixel dimensions for responsive design, video production, and image scaling while maintaining perfect proportions.

Original Dimension / Ratio

Width (W1)

Height (H1)

Common Presets

Target Width (W2)

Target Height (H2)

Ratio: 1.78:1

16:9

Tip: Change any value in the "New Dimensions" row and the other will update automatically based on your original ratio.