PRINT GUIDE · SIZE CHART
Photo print sizes: inches, millimetres and the pixels you need
Every common print size in one place: its real dimensions, its shape, and how many pixels a photo needs to fill it at 300 and 150 PPI. Use it to check a photo before you order, or to pick a size your photo already suits.
How to read the chart
Each row shows the print's short and long side. The shape is the long side divided by the short side. A photo with the same shape fills the print without cropping. The two pixel columns show what a photo needs to fill that print at 300 PPI, a common target for prints viewed up close, and at 150 PPI, a common floor for larger prints viewed from further away. Why those two numbers?
Standard photo print sizes (inches)
| Millimetres | Shape | Pixels at 300 PPI | Pixels at 150 PPI | |
|---|---|---|---|---|
| 4 × 6 in | 102 × 152 | 1.50 : 1 | 1,200 × 1,800 | 600 × 900 |
| 5 × 7 in | 127 × 178 | 1.40 : 1 | 1,500 × 2,100 | 750 × 1,050 |
| 6 × 8 in | 152 × 203 | 1.33 : 1 | 1,800 × 2,400 | 900 × 1,200 |
| 8 × 10 in | 203 × 254 | 1.25 : 1 | 2,400 × 3,000 | 1,200 × 1,500 |
| 8 × 12 in | 203 × 305 | 1.50 : 1 | 2,400 × 3,600 | 1,200 × 1,800 |
| 11 × 14 in | 279 × 356 | 1.27 : 1 | 3,300 × 4,200 | 1,650 × 2,100 |
| 12 × 18 in | 305 × 457 | 1.50 : 1 | 3,600 × 5,400 | 1,800 × 2,700 |
| 16 × 20 in | 406 × 508 | 1.25 : 1 | 4,800 × 6,000 | 2,400 × 3,000 |
| 20 × 30 in | 508 × 762 | 1.50 : 1 | 6,000 × 9,000 | 3,000 × 4,500 |
Millimetres are rounded to the nearest whole number. Pixels are inches × PPI.
ISO paper sizes (A-series)
A-sizes are defined in millimetres. Every A-size has the same shape, about 1.41 : 1, so a photo cropped for A4 also fits A3 or A5 exactly. That shape sits between a 3:2 photo (1.50) and a 4:3 photo (1.33), so both get trimmed slightly to fill an A-size page.
| Paper | Millimetres | Inches | Pixels at 300 PPI | Pixels at 150 PPI |
|---|---|---|---|---|
| A6 | 105 × 148 | 4.13 × 5.83 | 1,240 × 1,748 | 620 × 874 |
| A5 | 148 × 210 | 5.83 × 8.27 | 1,748 × 2,480 | 874 × 1,240 |
| A4 | 210 × 297 | 8.27 × 11.69 | 2,480 × 3,508 | 1,240 × 1,754 |
| A3 | 297 × 420 | 11.69 × 16.54 | 3,508 × 4,961 | 1,754 × 2,480 |
| A2 | 420 × 594 | 16.54 × 23.39 | 4,961 × 7,016 | 2,480 × 3,508 |
Inches are millimetres ÷ 25.4. Pixels are rounded to the nearest whole pixel.
Which sizes match your photo's shape?
Most phones save photos at 4:3 by default. Many cameras use 3:2. A photo fills a print without cropping only when the shapes match:
- 3:2 photos (1.50) match 4 × 6, 8 × 12, 12 × 18 and 20 × 30.
- 4:3 photos (1.33) match 6 × 8, and also 9 × 12 and 12 × 16 where a lab offers them.
- Square photos need square prints such as 8 × 8 or 12 × 12.
Popular sizes like 5 × 7, 8 × 10, 11 × 14 and 16 × 20 match neither common photo shape, so you'll either crop or get borders. How much each one crops.
Turn a megapixel count into a print size quickly.
Multiply the two pixel numbers for any row to get the megapixels it needs. An 8 × 10 at 300 PPI is 2,400 × 3,000 = 7.2 million pixels. A typical 12-megapixel phone photo has enough for that, as long as you don't crop away much of it first.
Three checks before you order
- Check the pixel size of the file you'll send, not the original. Photos cropped on a phone or sent through a messaging app can be much smaller.
- Check the shape. If your photo and the print don't match, decide yourself what gets cropped rather than leaving it to the lab's centre crop.
- Check the lab's own guidance. Some labs add a small bleed around the edge or trim a few millimetres, and many publish their own minimum resolution.
Check your own photo
Print Size Check reads your photo's pixel dimensions in your browser and shows the PPI, borders or crop at any of these sizes, or a custom size in inches or millimetres. Your photo isn't uploaded.
Check a photo's print sizeIndependent guide by Tidy. All figures are calculated from the dimensions shown. Checked 22 October 2026.