Aspect Ratio Calculator
Simplify image dimensions into an aspect ratio and calculate a proportional height for a new width.
Your result
Review your calculated values below.
Ready when you are.
Choose Calculate to see your result.
How to use this calculator
- Enter your values in the labeled fields, keeping the displayed units.
- Choose Calculate or press Enter in a single-line field.
- Review the result and the assumptions below before using it.
Formula and method
Ratio = width : height reduced by their greatest common divisor. New height = new width × original height / original width.
Worked example
1920 × 1080 has a 16:9 ratio. At a width of 1280 pixels, the matching height is 720 pixels.
What the result assumes
The suggested pixel height is rounded to the nearest whole pixel, which can introduce a tiny ratio difference.
Common question
Will this resize an image file?
No. It calculates dimensions to enter in an image editor without stretching the original proportions.