DPI and PPI calculator

Find print resolution from pixel size, or the pixels needed for a print.

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DPI and PPI calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Width (pixels)

Height (pixels)

Calculation

Print width (in)

Your result

More options and calculation details

Physical size unit

In Pixels to PPI mode, enter the desired physical print width as the reference. In the other modes, enter PPI. PPI measures image pixels; printer DPI is a separate device setting.

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

How this conversion works

Pixel width divided by print width in inches gives pixels per inch. The height uses the same density so the image keeps its aspect ratio.

To calculate the needed pixel dimensions, multiply physical inches by PPI, then round up to whole pixels. This does not resample or edit an image file.

Next: Length converter

A worked example

An 1800 × 1200 pixel image printed 6 inches wide has 300 PPI and a print height of 4 inches.

Next: Paper size converter

Before you use the result

This is a dimension calculator. It does not change an image’s resolution metadata or promise printer quality; printer dots and image pixels are different. Nonzero numeric inputs for these compound calculations are limited to 1e-40 through 1e40.

Next: Online ruler

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