Image & Privacy
Aspect Ratio Calculator
Find a simplified aspect ratio and the missing width or height so images scale without distortion.
Dimensions are calculated locally in your browser. No image or value is uploaded.
Original size
Common ratios
New size
Enter one side; the other is calculated from the original ratio.
Ratio and size
Aspect ratio
16:9
1.778
Pixels are rounded to whole numbers. The ratio is reduced with the greatest common divisor, so 1920×1080 becomes 16:9.
Why the ratio matters
Scaling an image without keeping its ratio distorts faces, logos, and text. Calculate the missing side first, then resize. For a crop to a new ratio, decide which side may be cut instead of squeezing the image.