All tools
Aspect ratio calculator
Simplify an image’s width-to-height ratio and find a height for a new width.
How to use
Enter original width and height and the required new width. Use positive whole pixels.
Calculation method
w:h ÷ gcd(w,h); h₂ = w₂ × h ÷ wExample
1920:1080 = 16:9; 1280 → 720
Questions
What should I check?
The new height may be fractional. Round it only when your image editor requires whole pixels.