Photo Print Sizes and Pixels Needed
Standard photo print sizes from wallet to 24×36 in, A4 and A3, with the pixels needed at 300, 200 and 150 DPI. See which prints your photo can make.
Pixel counts are short side × long side, rounded to whole pixels. Labs often add 1–3 mm of bleed that is trimmed off.
"nR" names (3R, 4R, 5R…) give the short side in inches and are used by labs in Korea and much of Asia; Japanese labs say L, KG and 2L. Korean labs sell the inch sizes and quote them in millimetres, e.g. 4×6 = 102 × 152 mm.
| Print size | Also called | Size (in) | Shape | 300 DPI | 200 DPI | 150 DPI | Your photo | Crop |
|---|---|---|---|---|---|---|---|---|
| Wallet (2.5 × 3.5 in) | 2R | 2.5 × 3.5 in | 5:7 · 1:1.4 | 750 × 1050 | 500 × 700 | 375 × 525 | 1152 DPI ✓ | 4.8% |
| 3.5 × 5 in (3R) | 3R · Japan L 89 × 127 mm · Europe 9 × 13 cm | 3.5 × 5 in | 7:10 · 1:1.429 | 1050 × 1500 | 700 × 1000 | 525 × 750 | 806 DPI ✓ | 6.7% |
| 4 × 4 in (square) | — | 4 × 4 in | 1:1 | 1200 × 1200 | 800 × 800 | 600 × 600 | 756 DPI ✓ | 25% |
| 4 × 6 in (4R) | 4R · Korea 102 × 152 mm · Japan KG 102 × 152 mm | 4 × 6 in | 2:3 · 1:1.5 | 1200 × 1800 | 800 × 1200 | 600 × 900 | 672 DPI ✓ | 11.1% |
| 5 × 7 in (5R) | 5R · Korea 127 × 178 mm · Japan 2L 127 × 178 mm | 5 × 7 in | 5:7 · 1:1.4 | 1500 × 2100 | 1000 × 1400 | 750 × 1050 | 576 DPI ✓ | 4.8% |
| 6 × 8 in (6R) | 6R · Japan 8P 152 × 203 mm | 6 × 8 in | 3:4 · 1:1.333 | 1800 × 2400 | 1200 × 1600 | 900 × 1200 | 504 DPI ✓ | 0% |
| 8 × 8 in (square) | — | 8 × 8 in | 1:1 | 2400 × 2400 | 1600 × 1600 | 1200 × 1200 | 378 DPI ✓ | 25% |
| 8 × 10 in (8R) | 8R · Japan 6P 203 × 254 mm | 8 × 10 in | 4:5 · 1:1.25 | 2400 × 3000 | 1600 × 2000 | 1200 × 1500 | 378 DPI ✓ | 6.3% |
| 8.5 × 11 in (Letter) | US Letter | 8.5 × 11 in | 17:22 · 1:1.294 | 2550 × 3300 | 1700 × 2200 | 1275 × 1650 | 356 DPI ✓ | 2.9% |
| 8 × 12 in (S8R) | S8R · Japan 6PW 203 × 305 mm | 8 × 12 in | 2:3 · 1:1.5 | 2400 × 3600 | 1600 × 2400 | 1200 × 1800 | 336 DPI ✓ | 11.1% |
| 10 × 12 in (10R) | 10R · Japan 4P 254 × 305 mm | 10 × 12 in | 5:6 · 1:1.2 | 3000 × 3600 | 2000 × 2400 | 1500 × 1800 | 302 DPI ✓ | 10% |
| 11 × 14 in (11R) | 11R | 11 × 14 in | 11:14 · 1:1.273 | 3300 × 4200 | 2200 × 2800 | 1650 × 2100 | 275 DPI ✗ | 4.5% |
| 12 × 18 in (S12R) | S12R | 12 × 18 in | 2:3 · 1:1.5 | 3600 × 5400 | 2400 × 3600 | 1800 × 2700 | 224 DPI ✗ | 11.1% |
| 16 × 20 in | 16R | 16 × 20 in | 4:5 · 1:1.25 | 4800 × 6000 | 3200 × 4000 | 2400 × 3000 | 189 DPI ✗ | 6.3% |
| 20 × 30 in | poster | 20 × 30 in | 2:3 · 1:1.5 | 6000 × 9000 | 4000 × 6000 | 3000 × 4500 | 134 DPI ✗ | 11.1% |
| 24 × 36 in | poster | 24 × 36 in | 2:3 · 1:1.5 | 7200 × 10800 | 4800 × 7200 | 3600 × 5400 | 112 DPI ✗ | 11.1% |
| 10 × 15 cm | Europe, close to 4 × 6 in | 3.94 × 5.91 in | 2:3 · 1:1.5 | 1181 × 1772 | 787 × 1181 | 591 × 886 | 683 DPI ✓ | 11.1% |
| 13 × 18 cm | Europe, close to 5 × 7 in | 5.12 × 7.09 in | 13:18 · 1:1.385 | 1535 × 2126 | 1024 × 1417 | 768 × 1063 | 569 DPI ✓ | 3.7% |
| 20 × 25 cm | Europe, close to 8 × 10 in | 7.87 × 9.84 in | 4:5 · 1:1.25 | 2362 × 2953 | 1575 × 1969 | 1181 × 1476 | 384 DPI ✓ | 6.3% |
| A4 (21 × 29.7 cm) | ISO 216 | 8.27 × 11.69 in | 1:1.414 | 2480 × 3508 | 1654 × 2339 | 1240 × 1754 | 345 DPI ✓ | 5.7% |
| A3 (29.7 × 42 cm) | ISO 216 | 11.69 × 16.54 in | 1:1.414 | 3508 × 4961 | 2339 × 3307 | 1754 × 2480 | 244 DPI ✗ | 5.7% |
Every photo print size needs a certain number of pixels to look sharp. This table lists the standard sizes from wallet and 4 × 6 up to 24 × 36 inches, the metric 10 × 15, 13 × 18 and 20 × 25 cm sizes, A4 and A3, with the names labs use elsewhere (3R, 4R, 5R; Japan's L, KG and 2L) and the pixels needed at 300, 200 and 150 DPI. Enter your photo's size to see its effective resolution on each print, how much is cropped when the shapes differ, and the largest print you can order without losing sharpness.
How to use this tool
- Enter your photo's width and height in pixels (or leave them empty to just read the table).
- Choose the print size you want to order.
- Pick the print quality: 300 DPI for photos held in the hand, 150–200 DPI for large prints on a wall.
- Read the effective resolution and crop, then check the table for the largest size marked ✓.
Formula
pixels = inches × DPI · effective DPI = pixels on the short side after cropping ÷ short side of the print in inches
When the photo and the print have different shapes, the lab crops the photo; the effective DPI is measured on what remains. Metric sizes are converted with 1 in = 2.54 cm.
Example
A 12 MP phone photo of 4032 × 3024 px (4:3) printed at 4 × 6 in (2:3) keeps the full 4032 px side, so the short side becomes 4032 ÷ 1.5 = 2688 px and 11.1% of the height is cropped. 2688 px over 4 in gives 672 DPI. At 300 DPI the largest standard print is 10 × 12 in (10R): 3024 px over 10 in is 302.4 DPI, while 11 × 14 would need 3300 px.
Frequently asked questions
How many pixels do I need for a 4 × 6 print?
1200 × 1800 px at 300 DPI, the usual photo-lab standard. At 200 DPI, 800 × 1200 px still looks good at normal viewing distance.
What are 3R, 4R and 5R, and Japan's L and 2L?
Lab names for the inch sizes, used in Korea and much of Asia: 3R = 3.5 × 5 in (Japan's L, 89 × 127 mm), 4R = 4 × 6 in (102 × 152 mm, Japan's KG) and 5R = 5 × 7 in (Japan's 2L, 127 × 178 mm). European 10 × 15 cm is about 2 mm smaller than 4 × 6 in.
Why does my 4 × 6 print cut off part of the photo?
Phone photos are usually 4:3 while 4 × 6 is 2:3, so about 11% of the picture is trimmed. Crop the photo yourself first to decide what is lost.
Is 300 DPI always necessary?
No. It matters for prints held in the hand; posters and canvases seen from further away are fine at 150 DPI.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/photo-print-size-tool/
Cite or embed this tool
kakaoCalc. (2026, November 8). Photo Print Sizes and Pixels Needed. https://kakao.mobile/tools/photo-print-size-tool/
“Photo Print Sizes and Pixels Needed.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/photo-print-size-tool/.
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