DPI Calculator

The dots per inch a print actually gets.

FREE · NO SIGN-UP · RUNS ON YOUR DEVICE

Your image never leaves the device

  • 4DPI LEVELS
  • 2DIRECTIONS
  • 0SIGN-UP
  • 1TAP TO COPY
Specification

DPI Calculator at a glance

DPI levels
150 to 600 dpi
Directions
Both directions
Units
Inches and centimetres
Megapixels
Megapixels shown
Files
No file needed
Price
Free
Account required
None
Where it runs
On your device
How to

How to use DPI Calculator

  1. 1

    Enter the pixels

    Enter the pixels.

  2. 2

    Read the table

    Read the table.

  3. 3

    Or work backwards

    Or work backwards.

Questions

Frequently asked questions

What DPI is my image?

On its own, none. Dots per inch only exists once a print size is chosen, which is why this asks for both.

How many pixels do I need for 300 dpi?

Three hundred for every inch. An eight by ten inch print needs 2400 by 3000 pixels.

Is DPI the same as PPI?

They are used interchangeably for this sum. Strictly, PPI describes the image and DPI describes the printer dots that reproduce it.

Can I raise the DPI of a photo?

Only by printing it smaller. Changing a number in software without adding real detail does not make the print sharper.

Background

Why DPI needs a size

Enter your pixel width and height and the table shows the largest print at each dots per inch level. Switch direction to find the pixels a target DPI needs.

  • A four thousand pixel wide image is 300 dpi at thirteen inches and 150 dpi at twenty-six.
  • The dpi field saved inside a file is metadata, and printers usually ignore it in favour of the size you choose.
  • Six hundred dots per inch is worth it for fine art and line work, rarely for photographs.
  • Scanning is where dpi genuinely describes the capture, because it sets how many samples per inch are taken.

Full specification

Specification of the DPI Calculator tool
DPI levelsOne fifty, two hundred, three hundred and six hundred, compared together.
DirectionsPrint size from a pixel count, or pixel count from a print size.
UnitsInches and centimetres, both shown together.
MegapixelsShown alongside, so a camera spec can be checked against a print.
FilesNone opened. The panel works from the numbers you type.
PriceFree. Supported by clearly labelled ads placed outside the working area.
Account requiredNo.
Where it runsIn your browser tab. Nothing is sent anywhere.
Next step

Keep going with the same files

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