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Print Size Calculator: Pixels to Inches and cm at Any DPI
Plan print sizes from pixels at 300, 240, 150, 72 or your own DPI, calculate required pixels, and compare common photo sizes.
Print Size Calculator: Pixels to Inches and cm at Any DPI: This calculator plans print sizes from pixel dimensions and a density you choose. It shows sizes at 300, 240, 150 and 72 DPI, calculates the pixels needed for a target size, and compares 4 × 6, 5 × 7, 8 × 10 inch, A4 and A3 prints. To inspect the DPI stored in a file instead, use [Image DPI Checker](/image-dpi-checker). Runs 100% locally in your browser with zero server file uploads.
- Category
- Image tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Pixels to print size
| DPI | Width × height (in) | Width × height (cm) |
|---|---|---|
| 300 | 10.00 × 6.67 | 25.40 × 16.93 |
| 240 | 12.50 × 8.33 | 31.75 × 21.17 |
| 150 | 20.00 × 13.33 | 50.80 × 33.87 |
| 72 | 41.67 × 27.78 | 105.83 × 70.56 |
Common photo sizes
Good: at least 300 DPI. Okay: 150–299 DPI. Low: below 150 DPI. Ratings use the best orientation and assume the image fills the paper; different proportions need cropping. Viewing distance and image sharpness also affect the result.
| Print size | Effective DPI | Rating | Pixels at 300 DPI | Pixels at 150 DPI | Cropping |
|---|---|---|---|---|---|
| 4 × 6 in | 500.0 | Good | 1200 × 1800 | 600 × 900 | Same proportions |
| 5 × 7 in | 400.0 | Good | 1500 × 2100 | 750 × 1050 | Needed to fill |
| 8 × 10 in | 250.0 | Okay | 2400 × 3000 | 1200 × 1500 | Needed to fill |
| A4 (21 × 29.7 cm) | 241.9 | Okay | 2481 × 3508 | 1241 × 1754 | Needed to fill |
| A3 (29.7 × 42 cm) | 171.0 | Okay | 3508 × 4961 | 1754 × 2481 | Needed to fill |
Print size to pixels
Required pixels at 300 DPI: 2400 × 3000. Each edge is rounded up.
This planner uses pixel dimensions and your chosen DPI. To read the DPI stored inside a PNG or JPG, use the Image DPI Checker linked below.
Match the shape of the paper
Print sizes have their own aspect ratios, and a photo fills the paper exactly only when the ratios match. Most cameras shoot 3:2, which matches 4 × 6 in; 5 × 7 is 7:5, 8 × 10 is 5:4, and A-series paper such as A4 is about 1:1.41. Phone photos are usually 4:3. Anything else is cropped by the lab or printed with white borders, so crop to the paper's ratio yourself to decide what is lost.
When the pixels come up short
If the size you want is only reached at 150 DPI or lower, there are three honest options: print smaller, accept some softness on a print that will be seen from a distance, or go back to a larger original. Enlarging in an editor adds pixels without adding detail, though AI upscalers can invent convincing texture in photos. In metric terms, 300 DPI is about 118 pixels per centimeter, so a 10 × 15 cm print needs about 1181 × 1772 pixels.
How to use it
- Choose a local image or enter its pixel width and height.
- Compare print sizes in inches and centimetres and the ratings for common paper sizes.
- Enter a target print size and DPI to calculate the pixels you need.
Privacy & limitations
Calculations and image loading happen locally in your browser. Nothing is uploaded.
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Frequently asked questions
How is this different from Image DPI Checker?
This tool plans sizes using pixels and your chosen DPI, even when the image has no density metadata. Image DPI Checker reads the DPI stored inside a PNG or JPG and the print size that metadata implies.
What do the ratings mean?
Good means at least 300 pixels per inch, okay means at least 150, and low means below 150. The calculation uses the best orientation and assumes the image fills the paper; different proportions require cropping. These are planning guides: image sharpness and viewing distance also matter.
Does changing DPI add detail?
No. A smaller print places the same pixels closer together. The reverse calculation rounds each edge up to show how many pixels cover your target size at the selected density.
Free tool · runs in your browser · no account required