Proportional resize
Aspect-ratio calculator
Simplify width and height into a familiar ratio, then calculate a new proportional image size without stretching.
◆ Runs locally in your browser
16:91920 × 1080
Proportional size
1280 × 720 px1.778 decimal ratioHOW IT WORKS
A clear answer, with the math to match.
Formula
new height = new width × original height ÷ original width1920 × 1080 simplifies to 16:9. At 1280 px wide, the proportional height is 720 px.
COMMON QUESTIONS
Useful context, not filler.
What is an aspect ratio?＋
It is the proportional relationship between an image's width and height, expressed as numbers such as 4:3, 3:2, or 16:9.
Does resizing change the aspect ratio?＋
Not when width and height are scaled proportionally. Changing only one dimension stretches or compresses the image.
Why do some print sizes crop my photo?＋
The paper and image may have different aspect ratios. Filling the entire print requires cropping part of the image.