When printing out an image, the resolution is measured in ink dots per inch (dpi). Therefore, when setting up your canvas you need to take the pixel size of your image and select a printing resolution (150 or 300 dpi) to calculate how big your image will print.
In Sketchbook for mobile devices, the maximum canvas size will be limited by the capacity of the device. Different devices will max out at different sizes, though the ultimate maximum canvas size is 100 megapixels. Keep in mind that bigger may not be better - a 4k canvas on your mobile device will be a very large file, taking both storage on your device and impacting performance due to the RAM requirements of such a large file.
See below for some common document sizes.
Dimensions of A-series paper sizes
| Size | Width x Height (mm) | Width x Height (in) |
|---|---|---|
| A1 | 594 x 841 mm | 23.4 x 33.1 in |
| A2 | 420 x 594 mm | 16.5 x 23.4 in |
| A3 | 297 x 420 mm | 11.7 x 16.5 in |
| A4 | 210 x 297 mm | 8.3 x 11.7 in |
US Paper sizes
| Size | Width x Height (mm) | Width x Height (in) |
|---|---|---|
| Letter | 216 x 279 mm | 8.5 x 11.0 in |
| Legal | 216 x 356 mm | 8.5 x 14.0 in |
Standard photo print sizes and resolutions
| Print size | Image size for 300 dpi |
|---|---|
| 3 x 5 inches | 900 x 1500 pixels |
| 4 x 6 inches | 1200 x 1800 pixels |
| 5 x 7 inches | 1500 x 2100 pixels |
| 8 x 8 inches | 2400 x 2400 pixels |
| 8 x 10 inches | 2400 x 3000 pixels |
| 8.5 x 11 inches | 2550 x 3300 pixels |
| 9 x 16 inches | 2700 x 4800 pixels |
| 11 x 14 inches | 3300 x 4200 pixels |
| 11 x 16 inches | 3300 x 4800 pixels |