# Aspect ratio calculator

> Find the ratio of any size, or the missing side for a ratio, with a live preview.

Canonical page: https://www.socialfaktory.com/tools/aspect-ratio-calculator

Type a width and a height to get the exact ratio, or pick a ratio and one side to get the other. Solved sides are rounded to even pixels, and a live preview shows the shape.

## How it works

1. **Enter a size**: Type a width and a height, or choose a ratio such as 9:16 and give one side.
2. **Read the ratio or the missing side**: The exact ratio is reduced to its simplest form. When it is not a common one, the closest common ratio is named too.
3. **Check the preview**: A box drawn at the ratio shows the shape before you resize anything.

## What you get

- Exact ratio by greatest common divisor, so 1920 by 1080 gives 16:9.
- Names the closest common ratio and how far off you are, for sizes like 1366 by 768.
- Reads 16:9, 16/9, 16x9 or a decimal like 1.78.
- Free, no signup, and nothing you type is sent to a server.

## Frequently asked questions

### How is the aspect ratio worked out?

Width and height are both divided by their greatest common divisor. 1920 by 1080 share a divisor of 120, which leaves 16:9.

### Why does 1366 by 768 not give a short ratio?

It reduces to 683:384, which is exact but awkward. The tool also names the closest common ratio, 16:9, and says by how much your size differs from it.

### Why are solved sides rounded to an even number?

Many video encoders need even dimensions, so a solved side is rounded to the nearest even pixel. When the exact value sits halfway between two even numbers, the larger one is used.

### Is anything I type stored?

No. Everything is worked out in your browser as you type. Nothing you type is sent to a server.

## More detail

- All free tools: https://www.socialfaktory.com/tools.md
- The paid product: https://www.socialfaktory.com/features.md
- Pricing: https://www.socialfaktory.com/plans.md