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DPI Calculator

Find how large an image prints, or the DPI it needs.

Work out
Image

300 for photo prints, 150 for posters.

Result

Print size at 300 DPIExample

10 × 6.67 in

25.4 × 16.9 cm

Width
10 in (25.4 cm)
Height
6.67 in (16.9 cm)
Megapixels
6 MP
Show stepsHide steps
  1. 3,000 px ÷ 300 DPI = 10 in
  2. 2,000 px ÷ 300 DPI = 6.667 in

Runs on your device.

Questions

What do DPI and PPI mean?

Both describe how many pixels go into each inch of a print. PPI (pixels per inch) is the precise term for images; DPI (dots per inch) is what printers and most people say. An image file has no physical size until it is printed, so the same 3000 × 2000 pixel photo is 10 × 6.7 inches at 300 DPI or 20 × 13.3 inches at 150.

What DPI do I need for printing?

300 DPI is the usual target for photos and anything seen up close. 150 to 200 is fine for larger prints, and posters or banners viewed from a few metres away can go lower. More than 300 rarely shows a visible difference.

Does changing the DPI setting improve quality?

No. The DPI stored in a file is only a note about the intended print size; changing it leaves every pixel as it was. To print larger at the same sharpness you need more pixels, which only a better original can really provide.

Why is the uncompressed size so much larger than my file?

It is what the image takes in memory or as an uncompressed TIFF or BMP: every pixel stored in full. JPG, PNG and WebP compress that, often to a tenth of the size or less.

Is it free? Do I need an account?

It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

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