A PrintScale guide
How big can I print a 12 megapixel photo?
Megapixels alone do not specify width and height. This guide uses a 4,000 × 3,000 pixel, 4:3 photo containing exactly 12 million pixels.
By PrintScale · Updated
Read the pixel dimensions, not just the megapixels
Twelve megapixels specifies a total count, not a unique rectangle. A square with about 12 million pixels and a 4:3 image with the same count have different long edges. Use the dimensions reported by your camera or image editor, especially after cropping or exporting through a messaging app.
For each side, inches = pixels ÷ PPI, then multiply by 2.54 for centimetres. You can turn the photo from landscape to portrait by swapping width and height; the available area stays the same.
Choose what the finished print needs
A lower density spreads the same pixels across a larger area. That may suit a poster viewed from a distance, but can reveal softness when inspected up close. A higher density concentrates the same source pixels in a smaller print. It does not improve the original focus.
When cropping a 4:3 image to another paper shape, recalculate with the cropped dimensions. Enlarging first cannot prevent the crop from discarding part of the image.
Print sizes for 4,000 × 3,000 pixels
| Image density | Source pixels | Print size, inches | Print size, cm |
|---|---|---|---|
| 150 PPI | 4,000 × 3,000 | 26.67 × 20.00 | 67.73 × 50.80 |
| 200 PPI | 4,000 × 3,000 | 20.00 × 15.00 | 50.80 × 38.10 |
| 240 PPI | 4,000 × 3,000 | 16.67 × 12.50 | 42.33 × 31.75 |
| 300 PPI | 4,000 × 3,000 | 13.33 × 10.00 | 33.87 × 25.40 |
| 600 PPI | 4,000 × 3,000 | 6.67 × 5.00 | 16.93 × 12.70 |
Sizes are rounded to two decimal places. These are geometric sizes at the chosen density, not a guarantee that every 12 MP photo will look equally sharp.
When an enlargement can help
If the original falls short of the pixel target, consider a smaller print, lower density agreed with the printer, or an enlargement. AI can generate plausible fine structure, so examine important details before printing. Keep the untouched original and compare an enlarged crop at the intended scale.
Enter your actual width and height in the calculator. For the distinction between screen size and print density, see Adobe's image-resolution guide.
When you have chosen a size, check an enlargement in PrintScale.