Resize To Aspect Ratio
Calculator
Results
- Target height (pixels)
- 900
- Scale factor
- 0.3
- Scale (%)
- 30
Design and print results
| Target height (pixels) | 900 |
| Scale factor | 0.3 |
| Scale (%) | 30 |
formula-map diagram
- Target height (pixels)
- 900
- Scale factor
- 0.3
- Scale (%)
- 30
Formula breakdown
Formula
new height = new width × (original height ÷ original width)= 900
Note
Simplified model: these are standard prepress and typographic relationships computed on nominal values. Real press bulk, paper caliper and shrinkage, ink limits for a given profile, font metrics and binding allowances vary by supplier and by job, so confirm with your printer and a proof before going to press.
More in Design and printing
See all →Frequently asked questions
How does the calculator find the new dimension that keeps proportions?+
It uses the original width-to-height ratio as a fixed multiplier: if you supply a new width, it multiplies that width by (original height / original width) to get the matching height, and vice versa.
Why does my resized image look stretched even though I used this calculator?+
Stretching happens when width and height are set independently without locking the ratio, which is exactly what this calculator prevents when its output is used correctly. If distortion still appears, the image editor likely overrode one of the two calculated values.
Can I resize to a ratio different from the original?+
Not without cropping or padding, since forcing a new ratio onto content proportioned for the old one will either stretch it or cut part of it off. This calculator preserves the existing ratio rather than converting to a new one.
Why does the calculated dimension come out as a decimal?+
Because the ratio math rarely divides evenly into whole pixels. Round to the nearest whole pixel — a fraction of a pixel doesn't exist in a raster image, and rounding by less than one pixel has no visible effect.
Should I round up or down when the result isn't a whole number?+
Either is fine for display purposes, but round up if the image will be scaled further afterward, since starting slightly larger avoids compounding blur from multiple resizing steps.