What size is A3?
297 × 420 mm
That is 29.7 × 42 cm, or approximately 11.69 × 16.54 inches. These are portrait dimensions. Swap width and height for landscape.
An A3 sheet folds into two A4 pages. Check that your printer supports A3: many everyday desktop printers accept A4 or Letter as their largest format.
A3 size in pixels
Paper has physical dimensions; its pixel dimensions depend on the resolution you choose. The values below are rounded to the nearest whole pixel.
| Image resolution | Width × height |
|---|---|
| 72 PPI | 842 × 1191 px |
| 150 PPI | 1754 × 2480 px |
| 300 PPI | 3508 × 4961 px |
| 600 PPI | 7016 × 9921 px |
At 300 PPI, a full A3 image is approximately 3508 × 4961 pixels. A folded four-page A4 booklet needs two A4 page positions per side of each A3 sheet.
Already have an image? Check its physical print size at your chosen PPI.
Printing and scaling A3
To fit A4 artwork on A3, use approximately 141.4%. To fit A3 artwork on A4, use approximately 70.7%. Leave room for your printer’s non-printable margins.
For a document that must retain its dimensions, select Actual size or 100% in your print dialogue, check the preview, then measure a test print. Read the actual-size printing guide.
Calculate a print scaleHow much does a sheet weigh?
At 80 gsm, one nominal A3 sheet weighs approximately 9.98 g. Paper GSM measures mass per square metre, so heavier stock changes the result without changing the page dimensions.
Calculate paper weight for your stock and number of sheets.