# DPI Calculator

> DPI calculator: pixels per inch from pixel dimensions and print size. Free dpi calculator with the formula shown - runs entirely in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/dpi-calculator/
- **Category:** Converters
- **Evidence level:** authored-methodology
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

DPI (PPI) = pixel width / printed width in inches.

## Worked example

A 3,000 pixel image printed at 10 inches wide resolves 300 dpi, the standard for crisp photo prints.

## Assumptions

- DPI here means pixels per printed inch (technically PPI).
- Printer dot patterns differ from image pixel resolution.

## Common questions

### How many dpi do I need to print?

Aim for 300 dpi for crisp photo prints; 150 dpi is acceptable for posters viewed at a distance.

### Is DPI the same as PPI?

Strictly, PPI describes image pixels per inch; DPI describes printer dots. The calculator uses pixel width over printed inches.

## Related tools

- /aspect-ratio-calculator/
- /image-resize/
- /file-size-calculator/

## Sources

- [Calculation methodology](/methodology/)
- [Quality evidence and verification standard](/quality-evidence/)

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