Aspect Ratio Calculator
Reduce width and height to the simplest aspect ratio like 16:9, with the decimal ratio. Fast and private.
Independently verified for accuracy
Calculator by Toolsloft ↗- Aspect ratio
- 16:9
- Decimal ratio
- 1.78
Reduce a pixel width and height to their simplest aspect ratio, such as 1920 by 1080 to 16:9. Enter the two dimensions to get the whole-number ratio and the decimal width-to-height figure. Useful for video, images, and screen layouts.
How this is calculated
The width and height are divided by their greatest common divisor to get the smallest whole-number ratio. The decimal value is the width divided by the height, rounded to two places. Inputs must be positive whole numbers of pixels.
How to use
- Enter the width in pixels.
- Enter the height in pixels.
- Read the simplified ratio and the decimal value.
Examples
- Widescreen:
1920 by 1080 reduces to 16:9 - Classic:
640 by 480 reduces to 4:3
FAQ
- How is the ratio simplified?
- Both numbers are divided by their greatest common divisor, which gives the smallest pair of whole numbers with the same proportion.
- What is the decimal value for?
- It is the width divided by the height. A value near 1.78 is 16:9, and 1.33 is 4:3, which helps when a tool wants a single number.
- Can I enter non-whole numbers?
- No. Aspect ratios are reduced from whole pixel dimensions, so both width and height must be positive whole numbers.