16.7 MP
Needed at 300 DPI
7.4 MP
Needed at 200 DPI
40.0×30.0 cm
Size in cm
1.33:1
Aspect ratio
30 in
Typical viewing distance
Pixels needed for a 30×40 cm print#
At normal viewing distance (≈1.5× the diagonal, 0.8 m) about 200 DPI is indistinguishable from 300 DPI for most viewers.
| Resolution | Quality | Pixel dimensions | Megapixels |
|---|---|---|---|
| 360 DPI | Exceptional (close inspection) | 5,670 × 4,252 px | 24.1 MP |
| 300 DPI | Photo-lab standard | 4,725 × 3,543 px | 16.7 MP |
| 240 DPI | Fine-art inkjet | 3,780 × 2,834 px | 10.7 MP |
| 200 DPI | Large wall print | 3,150 × 2,362 px | 7.4 MP |
| 150 DPI | Poster, viewed from 1 m+ | 2,362 × 1,772 px | 4.2 MP |
| 100 DPI | Billboard / banner | 1,575 × 1,181 px | 1.9 MP |
Cropping from your camera#
| Camera aspect ratio | What happens | Image kept |
|---|---|---|
| 3:2 (full frame, APS-C) | Crop the long side | 89% |
| 4:3 (MFT, phones) | No crop needed | 100% |
| 16:9 | Crop the long side | 75% |
| 1:1 | Crop the short side | 75% |
Print size calculator#
Maximum print size—
In centimetres—
Megapixels · aspect ratio—
Will my camera be enough?#
A 24 MP camera (6000 × 4000 px) prints 381 DPI on the long side at 30×40 cm — more than enough. A 12 MP phone (4032 × 3024) gives 256 DPI. See the 16 megapixel guide.
Metric wall print.
Other print sizes#
Wallet (2.5×3.5 in)3.5×5 in4×6 in5×5 in5×7 in6×8 in8×8 in8×10 in8.5×11 in (US Letter)8×12 in10×10 in11×14 in12×12 in11×17 in (Tabloid)12×16 in12×18 in13×19 in (Super B / A3+)16×20 in16×24 in18×24 in20×24 in20×30 in24×30 in24×36 in30×40 in40×60 inA6 (105×148 mm)A5 (148×210 mm)A4 (210×297 mm)A3 (297×420 mm)A3+ (329×483 mm)A2 (420×594 mm)A1 (594×841 mm)A0 (841×1189 mm)10×15 cm13×18 cm20×30 cm30×45 cm40×60 cm50×70 cm60×90 cm
Frequently asked questions#
How many megapixels do I need for a 30×40 cm print?
16.7 MP for 300 DPI photo-lab quality, 7.4 MP at 200 DPI, and 4.2 MP at 150 DPI.
What resolution is 30×40 cm at 300 DPI?
4,725 × 3,543 pixels.
Last updated October 03, 2026 · How we calculate · Sources