Print Size Calculator — Pixels to CM/Inches at Any DPI

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How big can I print this? Pixels → cm/inch at any DPI — both directions.

Width (px)

Height (px)

DPI

Reverse: target print width (cm) → pixels needed

How to use this tool

1. Enter your image's pixel dimensions and the print DPI (300 for professional print).
2. Read the maximum print size in cm and inches — with a quality verdict.
3. Or reverse it: enter a target width in cm to learn the pixels you need.

Example

3000 × 2000 px at 300 DPI → 25.4 × 16.9 cm — a crisp A4-ish print. To print 21cm wide at 300 DPI you need 2,480 px — so a 3000px file has room to spare, while an 800px screenshot does not.

The formula

inches = pixels ÷ DPI  |  cm = inches × 2.54  |  pixels = cm ÷ 2.54 × DPI

What the result means

DPI is the density argument of the print, not a property of the file — the same pixels print bigger at 150 DPI and sharper at 300. 300 DPI is the professional standard viewed at arm's length; large posters tolerate 150 because distance forgives softness.

Frequently asked questions

Is 300 DPI always necessary?

For photos and brochures, yes. For billboards, no — viewed from 20 meters, 30 DPI can pass. Match DPI to viewing distance.

My file says 72 DPI — is it bad?

That tag is metadata, not destiny. Change the DPI interpretation and the same pixels print at a different size — which is exactly what this calculator shows.

What size file do I need for an A4 photo print?

A4 is 21 × 29.7 cm; at 300 DPI that's 2480 × 3508 px — about 8.7 megapixels.

Is anything uploaded?

No — pure arithmetic, in your browser.

More tools from Darkroom Isle

Image Dimension CheckerSize, ratio, megapixelsImage ResizerExact pixels or percentagesImage CompressorShrink to any KBAspect Ratio CalculatorOn Palette Atoll

Explore the island world

• Darkroom Isle — the island where this tool lives.
• The Main Island — drive the boat, explore the whole world.
• The 90s Kids Island — where most of us started.

Privacy & data: this tool runs entirely in your browser — nothing you type is uploaded, saved or sent anywhere. · Disclaimer: your images are opened and processed by your own browser only — files never leave your device, and originals are never modified. · Privacy Policy · Disclaimer