Enter dimensions
Type pixel dimensions or load them from a local image.
FREE IMAGE ASPECT RATIO CALCULATOR
Free Image Aspect Ratio Calculator
Enter width and height or choose an image to calculate its simplified ratio and matching dimensions.
Your image and values are never uploaded or stored.
- 1Enter dimensions
- 2Calculate in browser
- 3Copy results
1 · Enter dimensions
Find a ratio from dimensions
Enter width and height to reduce them to the simplest whole-number ratio.
3 · Copy results
Aspect ratio result
Enter width and height to see the simplified ratio and details.
- Simplified ratio
- Decimal ratio
- Orientation
- Total pixels
- Megapixels
- Greatest common divisor
CSS ratio
2 · Calculate in browser
Calculate matching dimensions
Choose a ratio and one new side to calculate the other dimension.
Calculated dimensions
FREE ASPECT RATIO GUIDE
Calculate an image ratio in three steps
Get the numbers you need in your browser without installing software or creating an account.Check the ratio
Review the simplified ratio, decimal value, and orientation.
Match a new size
Use a ratio and one side to calculate the other pixel dimension.
FROM RATIO TO EDITING
When is an aspect ratio calculator useful?
Plan dimensions before resizing or cropping an image.
Screens and thumbnails
Compare the current size with common frames such as 16:9, 4:3, and 1:1.
Plan before cropping
Find the width-to-height relationship before opening the crop tool.
Ready-to-use CSS
Copy the calculated aspect-ratio property into a web layout.
FREE IMAGE ASPECT RATIO CALCULATOR FAQ
Image aspect ratio calculator FAQ
Learn about free use, calculation rules, local image reading, and resizing.1Is the image aspect ratio calculator free?
Yes. It is free with unlimited use and no account is required.
2Is my image uploaded?
No. Your browser only reads its natural width and height; the file is not sent to a server.
3What is the ratio of 1920×1080?
Dividing both values by their greatest common divisor, 120, gives 16:9. The decimal ratio is about 1.778.
4Does this tool resize the image file?
No. It only calculates numbers. Use the image resizer or crop tool to change an actual file.