Shape & scale
Aspect ratio calculator
Reduce any width and height to a clean ratio, then calculate a proportional resize without stretching the image.
new height = width ÷ ratio
01 / Original frame
px
px
px
Change the new width to solve the matching height while preserving the original proportions.
02 / Reduced ratio
16:9The simplest whole-number ratio
Proportional resize1280 × 720 px
Decimal ratio1.7778
Original image2.07 MP
OrientationLandscape
Common divisor: 120
Why it matters
Preserve shape. Change scale.
Aspect ratio describes shape, not size. A 1920 × 1080 image and a 1280 × 720 image are both 16:9. Resizing one dimension without changing the other proportionally stretches or squashes the picture.
ratio = width ÷ height
new height = new width × original height ÷ original width
new height = new width × original height ÷ original width
When a destination uses a different ratio, choose intentionally between cropping, padding, or fitting inside the available frame.