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Aspect Ratio Calculator
Calculate an image's aspect ratio and find the new height when resizing its width while preserving proportions.
- New height
- 720
- Height in whole pixels
- 720
- Width-to-height ratio
- 1.777778
- Scale factor
- 0.666667
How the calculation works
Aspect ratio r = width/height. New height = new width/r. Scale factor = new width/original width.
Inputs
- Original width
- Original height
- New width
Calculation details
A 1920 × 1080 image has a 16:9 ratio. At a new width of 1280 pixels, its height is 720 pixels.
Raster image dimensions must be rounded to whole pixels. The geometric result is also shown so you can see the effect of rounding.
Updated: 2026-10-02