What is an aspect ratio?
An aspect ratio describes the proportional relationship between width and height. A 16:9 image is 16 units wide for every 9 units high, regardless of its pixel dimensions.
Free creator tool
Aspect Ratio Calculator
Simplify any width and height, or use a ratio to calculate the missing dimension—instantly and privately in your browser.
Calculator
What do you need to calculate?
Use positive whole-number dimensions.
Simplified ratio
Common presets
The simple method
How it works
- 01
Choose a mode
Simplify two dimensions or find one missing dimension.
- 02
Enter your values
Type dimensions directly or start with a common preset.
- 03
Use the result
Copy the ratio or dimension into your creative workflow.
Common aspect ratios
These common ratios are useful starting points. The same ratio can represent many different pixel dimensions.
| Ratio | Example dimensions | Often used for |
|---|---|---|
| 1:1 | 1080 × 1080 | Square images and profile graphics |
| 4:3 | 1600 × 1200 | Traditional displays and presentation content |
| 3:2 | 1500 × 1000 | Photography and print-style compositions |
| 16:9 | 1920 × 1080 | Widescreen video, thumbnails, and presentations |
| 9:16 | 1080 × 1920 | Vertical video and mobile-first stories |
| 21:9 | 2560 × 1080 | Ultrawide video and cinematic layouts |
Frequently asked questions
How do I simplify an aspect ratio?
Divide both dimensions by their greatest common divisor. For 1920 × 1080, the greatest common divisor is 120, producing the simplified ratio 16:9.
Can I calculate a missing width or height?
Yes. Choose Find dimension, enter a ratio, select whether you know the width or height, and enter that value. The calculator updates the missing dimension immediately.
Does this calculator round results?
The calculation keeps its unrounded numeric result. For readability, a calculated dimension is displayed with up to six decimal places, and very large values use scientific notation.
Are my dimensions uploaded or saved?
No. Calculations happen in your browser. Entered dimensions are not sent to a server, stored, or included in analytics events.
Coming later
More focused creator tools
Image dimension and social media sizing tools are being considered. They will appear here only when they are ready to use.