,
Increase DPI Check DPI Resize Image Convert Format Compress Image Merge JPG to PDF Pin Image Generator Crop Image Rotate & Flip Image Image Filters Add Watermark Passport Photo Maker EXIF & Metadata Viewer Meme Generator Add Text to Image Circle Crop Round Corners Add Border Split Image Join Images Pixelate Image Blur Region Photo Collage Maker Favicon Generator DPI Calculator Black & White Converter Sharpen Image Social Media Resizer See all →

DPI Calculator Online

Answer the two questions every print job asks: how large will this photo print, and how many pixels do I need?

Print Size Calculator

No image needed — just numbers, answered instantly.

DPI is a simple division: pixels divided by DPI equals inches. A 3000×2000 photo at 300 DPI prints at 10×6.7 inches; the same photo at 72 DPI claims 41.7×27.8 inches — which is exactly why a sharp photo gets rejected as “low resolution” by a print shop. The pixels were fine; the label was wrong.

Use the first calculator when you have a photo and want its print size, and the second when you have a print size in mind (a 10×8 frame, an A4 poster) and need to know how many pixels to aim for. Both answers update as you type, in inches and centimetres.

Once you know the numbers, set the actual DPI tag with the free DPI converter — and if your photo is short on pixels, resize it first (keeping in mind that enlarging adds no real detail).

Common print sizes at 300 DPI

4 × 6 in needs 1200 × 1800 px · 5 × 7 in needs 1500 × 2100 px · 8 × 10 in needs 2400 × 3000 px · A4 (8.3 × 11.7 in) needs 2480 × 3508 px · 12 × 18 in needs 3600 × 5400 px.

How to use it

1

Print size from pixels

Type your photo's pixel width and height and a DPI — the print size in inches and cm appears instantly.

2

Pixels from print size

Type the print width and height you want and a DPI — the pixels you need appear instantly.

3

Fix the file

Set the DPI tag with the DPI converter so the file claims the size you just calculated.

Frequently asked questions

How is print size calculated?
Pixels divided by DPI equals inches. 3000 px at 300 DPI prints at 10 inches; at 72 DPI the same file claims 41.7 inches.
What DPI should I use?
300 DPI for photo prints, books and magazines; 150 DPI for large posters viewed from a distance; 600 DPI for fine line art.
Why was my sharp photo rejected as low resolution?
Usually the DPI tag, not the pixels. A 3000 px photo tagged 72 DPI claims a huge print size, so preflight software calls it low resolution. Retag it to 300 DPI.
Does DPI change my photo's quality?
No. DPI only changes the claimed print size. Real quality comes from pixel dimensions.

Before & after sample

Sample photo — try the tool above with your own image for the real result.

Pixels at 72 DPI
Before
3000 × 2000 px photo at 72 DPI → prints 41.7 × 27.8 in
3000 × 2000 px photo at 300 DPI → prints 10.0 × 6.7 in
Same pixels — only the DPI label changed.
Same pixels at 300 DPI