Aspect Ratio & Print Size Calculator

Enter the original pixel size. Add a new width or height to keep the same proportions, and set a DPI to see how large it prints.

Aspect ratio calculator

Original width (px)

Original height (px)

New width (px, optional)

New height (px, optional)

Print resolution (DPI)

The formula

New height = new width × original height ÷ original width. The ratio itself is width and height divided by their greatest common divisor (1920 × 1080 → 16:9).

Print size = pixels ÷ DPI. 300 DPI is the usual target for photo prints; 150–200 DPI is fine for large posters viewed from a distance. To actually resize a file, use the free image resizer.

FAQ

What is the aspect ratio of 1920×1080?

16:9.

How do I resize without stretching?

Keep the aspect ratio: change one side and calculate the other with the formula above, or lock proportions in the resizer.

How big can I print a 12 MP photo?

4000 × 3000 px prints at 13.3 × 10 inches at 300 DPI, or about 20 × 15 inches at 200 DPI.

X Facebook Reddit WhatsApp LinkedIn

Embed this free calculator on your site (copy & paste):

<iframe src="https://pixsquish.pages.dev/aspect-ratio-calculator/?embed=1" width="100%" height="640" style="border:1px solid #ddd;border-radius:12px" loading="lazy" title="PixSquish calculator"></iframe><p style="font-size:13px">Calculator by <a href="https://pixsquish.pages.dev/aspect-ratio-calculator/">PixSquish</a></p>

Free calculator by PixSquish