DPI stands for Dots Per Inch. It describes how many dots of ink (or pixels) fit in one inch of printed output. Higher DPI means sharper prints. For digital screens, PPI (Pixels Per Inch) is the technically correct term.

Is 300 DPI always necessary?

For viewing distances under 50 cm (books, prints), 300 DPI is ideal. For posters viewed from 1+ metres, 150 DPI is fine. For billboards, even 30-72 DPI works because they are viewed from far away.

How do I find the DPI of an existing image?

In Photoshop, go to Image > Image Size. In Procreate, check Canvas > Canvas Information. On Windows, right-click the file > Properties > Details. Note that DPI metadata can be changed without altering pixels.

What is the difference between DPI and PPI?

PPI (Pixels Per Inch) refers to screen display, DPI (Dots Per Inch) to print output. They are often used interchangeably in digital art. When preparing files, the important thing is the total pixel count and desired print size.

Can I change DPI without changing pixels?

Yes — changing DPI without resampling only changes the metadata (intended print size). The pixel count stays the same. In Photoshop, uncheck "Resample" in Image Size to change DPI without altering pixels.

ArtCalcs

DPI Calculator — Convert Between DPI, Pixels & Print Size

Convert between DPI, pixel dimensions and physical print size.

Conversion Mode

Pixel Width

Pixel Height

DPI

How We Calculate This

How DPI Conversion Works

Print size (cm) = (Pixels / DPI) x 2.54

Pixels = (cm / 2.54) x DPI

DPI = Pixels / (cm / 2.54)

Select your conversion mode and enter the known values. The calculator handles the conversion between pixels, centimetres and DPI in either direction.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.