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Print Size Calculator

Convert pixels and DPI into printed size in centimetres and inches, or work back from a print size to the pixels needed.

Work out print size

Printed size: —
In inches: —
Pixels: —
A4 at this DPI needs —
Standard size Inches Pixels at 300 DPI
Passport photo 1.4 x 1.8 413 x 531
6 x 4 inch photo 6 x 4 1800 x 1200
7 x 5 inch photo 7 x 5 2100 x 1500
10 x 8 inch photo 10 x 8 3000 x 2400
A6 card 5.8 x 4.1 1748 x 1240
A5 print 8.3 x 5.8 2480 x 1748
A4 print 11.7 x 8.3 3508 x 2480
A3 poster 16.5 x 11.7 4961 x 3508
A print needs about 300 DPI for sharp results at reading distance; large posters are often fine at 150 DPI.

How to use the Print Size Calculator

  1. Choose whether you are converting pixels to a print size or the reverse.
  2. Enter the pixel or size values and set the DPI of your printer.
  3. Read the printed size in centimetres and inches, or the pixels required.

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Frequently Asked Questions

Common questions about the free online print size calculator.

Divide the pixel width by the DPI, then multiply by 2.54 for centimetres. The calculator does this for both sides as you type.
About 300 DPI for photos and small prints, 150 DPI for posters viewed from a distance, and 72 DPI only for screens.
At 300 DPI an A4 sheet needs roughly 3508 by 2480 pixels, which is about 8.7 megapixels. The table shows the exact figures.
Switch the direction to print size to pixels, enter the width and height in centimetres or inches, then set the DPI you need.
DPI describes printer dots while PPI describes image pixels per inch. For print sizing the two numbers are used the same way.
You can, but the print will look soft because the pixel count is spread over more area. Check the DPI figure the tool reports.
Yes. The table lists passport, 6 by 4, 7 by 5 and 10 by 8 inch photos plus A6, A5, A4 and A3 paper sizes.
No. Every calculation runs in your browser, so nothing you enter is ever transmitted.
Yes. The calculator is fully responsive and works on phones, tablets and desktops.

Last updated: October 10, 2026