Photo print size in pixels
18×24 Print Size in Pixels
An 18 × 24 inch print needs 5400 × 7200 pixels at 300 PPI. It measures 45.72 × 60.96 cm and has a 3:4 aspect ratio.
18 × 24 in at 300 PPI: 5400 × 7200 px (38.9 MP)
At 240 PPI: 4320 × 5760 px · at 150 PPI: 2700 × 3600 px
18×24 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 | 2700 × 3600 | 3600 × 2700 | 9.7 |
| 200 PPI | 3600 × 4800 | 4800 × 3600 | 17.3 |
| 240 PPI | 4320 × 5760 | 5760 × 4320 | 24.9 |
| 300 PPI | 5400 × 7200 | 7200 × 5400 | 38.9 |
Calculate a canvas with your own settings
Your dimensions
On your device5,400 × 7,200 pixels
18 × 24 in at 300 PPI · nearest pixel
- Total pixels
- 38.88 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 | 18 |
|---|---|
| Print height | 24 |
| Size unit | Inches (in) |
| Target resolution | 300 PPI |
| Pixel rounding | Nearest whole pixel |
| Required width (px) | 5,400 |
|---|---|
| Required height (px) | 7,200 |
| Exact width before rounding (px) | 5,400 |
| Exact height before rounding (px) | 7,200 |
| Effective width PPI | 300 |
| Effective height PPI | 300 |
Will my photo fit 18×24 without cropping?
18 × 24 inches has a 3:4 proportion. It matches 4:3 phone and compact camera frames, while 3:2 frames need cropping.
| Example source | Cropped pixels | Image kept | Density at 24 × 18 in |
|---|---|---|---|
| 3:2 camera frame6000 × 4000 px | 5332 × 3999 | 88.8% | 222 PPI |
| 4:3 phone frame4032 × 3024 px | 4032 × 3024 | 100% | 168 PPI |
| 16:9 video frame3840 × 2160 px | 2880 × 2160 | 75% | 120 PPI |
Example source sizes illustrate common proportions; enter your own dimensions in the crop calculator or image print checker.
How many megapixels does a 18×24 print need?
At 300 PPI the print needs 38.9 megapixels after any crop; at 240 PPI, 24.9 MP; at 150 PPI, 9.7 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.