DPI calculator and print dimensions

Convert pixels and density into inches or centimetres. Find effective print PPI without changing the image file.

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Set your data

Calculation

Width (pixels)

Height (pixels)

Density (PPI)

Print width

Length unit

Up to 1,000,000 pixels per side; entered density from 1 to 100,000 PPI. Images are not resampled.

Result

Enter your values to see the result.

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How to use it

Start with the image’s actual pixel dimensions, then choose a print width and unit. If a lab specifies a density, calculate the achievable print size. If you already know the width, calculate the effective PPI instead.

Example inputs
Input	Result
3000 × 2000 px; 300 PPI	25.4 × 16.9333333333 cm

Method and limits

PPI means pixels per inch. Printer DPI describes ink dots: changing metadata cannot add image detail.

Example

Usage scenario

Input: 3000 × 2000 px; 300 PPI
Result: $\frac{2000}{300} \times 2.54 = 16.9333333333$

Calculation steps

Convert pixels to inches
$\frac{3000}{300} = 10$
Convert the width to centimetres
$10 \times 2.54 = 25.4$
Calculate the height in centimetres
$\frac{2000}{300} \times 2.54 = 16.9333333333$

A 3000-pixel-wide image at 300 PPI measures ten inches, or 25.4 cm. Printing the same pixels across twenty inches reduces the density to 150 PPI. The image has not gained additional detail.

What are the limits of this tool?

Up to 1,000,000 pixels per side; entered density from 1 to 100,000 PPI. Images are not resampled.

Inputs and results are processed in your browser and are not sent to the server. Aggregate statistics, when enabled, record only the tool and outcome, without the content.

Sources

MDN — resolution

PRACTICAL GUIDES

DPI vs PPI: choosing a print resolution

Connect pixel count, physical size and viewing distance. Check a ten-inch print with a worked 300 PPI example.

Follow the steps