Photo print size in pixels
12×18 Print Size in Pixels
A 12 × 18 inch print needs 3600 × 5400 pixels at 300 PPI. It measures 30.48 × 45.72 cm and has a 2:3 aspect ratio.
12 × 18 in at 300 PPI: 3600 × 5400 px (19.4 MP)
At 240 PPI: 2880 × 4320 px · at 150 PPI: 1800 × 2700 px
12×18 in pixels at each density
Multiply each inch dimension by the density. The results are exact because both sides are whole inches.
| Density | Portrait | Landscape | Megapixels |
|---|---|---|---|
| 150 PPI | 1800 × 2700 | 2700 × 1800 | 4.9 |
| 200 PPI | 2400 × 3600 | 3600 × 2400 | 8.6 |
| 240 PPI | 2880 × 4320 | 4320 × 2880 | 12.4 |
| 300 PPI | 3600 × 5400 | 5400 × 3600 | 19.4 |
Calculate a canvas with your own settings
Your dimensions
On your device3,600 × 5,400 pixels
12 × 18 in at 300 PPI · nearest pixel
- Total pixels
- 19.44 MP
- Width density
- 300 PPI
- Height density
- 300 PPI
Nearest-pixel rounding can fall slightly below the target on one axis. Use Round up when the target is a strict minimum.
This is the canvas size. Changing a file’s PPI metadata alone does not create these pixels.
Calculation details & inputs
| Print width | 12 |
|---|---|
| Print height | 18 |
| Size unit | Inches (in) |
| Target resolution | 300 PPI |
| Pixel rounding | Nearest whole pixel |
| Required width (px) | 3,600 |
|---|---|
| Required height (px) | 5,400 |
| Exact width before rounding (px) | 3,600 |
| Exact height before rounding (px) | 5,400 |
| Effective width PPI | 300 |
| Effective height PPI | 300 |
Will my photo fit 12×18 without cropping?
12 × 18 inches is a 2:3 enlargement, matching a full 3:2 camera frame without cropping.
| Example source | Cropped pixels | Image kept | Density at 18 × 12 in |
|---|---|---|---|
| 3:2 camera frame6000 × 4000 px | 6000 × 4000 | 100% | 333 PPI |
| 4:3 phone frame4032 × 3024 px | 4032 × 2688 | 88.9% | 224 PPI |
| 16:9 video frame3840 × 2160 px | 3240 × 2160 | 84.4% | 180 PPI |
Example source sizes illustrate common proportions; enter your own dimensions in the crop calculator or image print checker.
How many megapixels does a 12×18 print need?
At 300 PPI the print needs 19.4 megapixels after any crop; at 240 PPI, 12.4 MP; at 150 PPI, 4.9 MP. These are arithmetic targets, not a promise of print quality: focus, noise and viewing distance matter too.
Changing an image’s PPI setting without resampling only changes its intended print size. Read what changing DPI actually does before upsizing a file.