Calculators

Print Size & DPI

Convert print length and pixels at a chosen resolution.

Runs in your browser · No file or text uploads

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ABOUT THIS TOOL

What Print Size & DPI helps you do

Calculate how many pixels a printed length requires, or the print length of an image at a given DPI. This tool does not rewrite files or DPI metadata.

How to use it

Choose the input unit and enter a length or pixel count.
Enter the print resolution in DPI.
Compare pixels, millimeters and inches.

Input and output example

INPUT

210 mm / 300 DPI

OUTPUT

About 2,480 px / 8.267717 inches

Supported formats and limits

Size and DPI must be positive. DPI must not exceed 100,000.
The formula describes print density; it does not guarantee printer quality or add image detail.

How the result is calculated

1 inch = 25.4 mm. px = mm ÷ 25.4 × DPI; mm = px ÷ DPI × 25.4. Pixels round to the nearest integer and lengths use at most 6 decimal places.

Frequently asked questions

Does a higher DPI make an existing photo sharper?

Changing a number or metadata cannot create detail. Use an original image with enough pixels for the desired print size.