Aspect Ratio Calculator
Reduce a width and height to their simplest ratio, then find the matching height for a new width. This helps size images, video and display layouts.
Runs locally in your browser
Reduced aspect ratio
16:9
Width ÷ height
1.7778
Scaled dimensions: 1280 × 720 px
What is the Aspect Ratio Calculator?
Reduce a width and height to their simplest ratio, then find the matching height for a new width. This helps size images, video and display layouts.
How to use it
- 1Enter original width and height in pixels.
- 2Read the reduced ratio.
- 3Enter a new width to calculate the proportional height.
How it works
The greatest common divisor reduces the integer dimensions. The new height is the target width divided by the original width-to-height ratio.
Scale 1080p
1920 × 1080 reduces to 16:9. At a width of 1280 pixels, the proportional height is 720 pixels.
Limitations & notes
- Scaled height is rounded to a whole pixel.
- A ratio does not indicate image quality or whether upscaling will look sharp.
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