Resize without distortion
Enter the original proportions and calculate the missing dimension instead of stretching the image.
Free aspect ratio calculator
Find and preserve any aspect ratio.
Enter the original width and height to simplify the ratio, then calculate a matching second dimension for resizing or printing.
Instant resultsNo signupRuns in your browser
Simplified aspect ratio16:9Decimal ratio 1.778:1
Matching dimensions16 × 9
When to use it
Start with the result you need
This calculator is most useful when one part of the print specification is known and another needs to be checked.
Preview a print crop
Compare the image ratio with the paper ratio to see whether edge-to-edge printing will remove content.
Choose a matching frame size
Find physical sizes that preserve the source proportions and minimise cropping or unwanted borders.
The calculation
How it works
Divide the width and height by their greatest common divisor to simplify the ratio. For example, 1920 × 1080 becomes 16:9.
To resize without distortion, multiply the new width by the original height-to-width relationship.
Quick reference
Common image and print aspect ratios
Sizes in the same row share a shape even when their units and total dimensions differ.
| Ratio | Matching examples | Typical use |
|---|---|---|
| 1:1 | 8 × 8, 12 × 12 | Square artwork and photos |
| 3:2 | 4 × 6, 12 × 18, 24 × 36 | Many camera images and photo prints |
| 4:3 | 8 × 6, 12 × 9 | Some cameras and digital artwork |
| 4:5 | 8 × 10, 16 × 20 | Portrait and art prints |
| 16:9 | 1920 × 1080, 3840 × 2160 | Widescreen digital media |
| 1.414:1 | A5, A4, A3 | ISO A-series paper |
A-series paper uses the square-root-of-two relationship, so its decimal ratio is approximately 1.414:1.
Check the numbers
1920 × 1080 pixels
The simplified ratio is 16:9. A matching 1200-pixel width requires a height of 675 pixels.
8 × 10 inch print
The simplified ratio is 4:5. A 16-inch-wide version at the same ratio must be 20 inches high.
3:2 photo on A4 paper
The proportions do not match. Filling A4 requires cropping, while fitting the whole photo leaves a margin.
Before you export
Common mistakes to avoid
Typing width and height independently
Forcing both dimensions changes the proportions and can stretch faces, circles and typography.
Cropping after the resolution check
A later crop removes pixels and changes effective PPI. Set the composition first, then check print quality.
Assuming A4 and Letter are interchangeable
They have different proportions. Moving between them can alter margins, page flow or the visible crop.
Find and preserve any aspect ratio. FAQ
What is an aspect ratio?
It is the proportional relationship between width and height. The same ratio can describe pixels, inches, centimetres or any consistent unit.
Why does my image crop when printed?
If the image and paper have different aspect ratios, fitting edge to edge requires cropping one dimension. Otherwise the print needs borders.
Does aspect ratio determine resolution?
No. Aspect ratio describes shape, not detail. Two images can share a ratio while having very different pixel dimensions and print quality.
Reviewed for accuracy: 28 July 2026