A3 at 72 dpi — 842×1191 pixels

297×420 mm at 72 dpi comes to 842×1191 pixels. On 80 g paper one sheet weighs 9.98 grams.

millimetres: 297 × 420 mm
inches: 11.69 × 16.54 in
Pixels: 842 × 1191 px
All the pixels together: 1 MP
Uncompressed, that is: 2.9 MB
Area: 0.1247 m²
Ratio of the sides: 1 : 1.414
Sheets in one letter: 2

Weight per sheet

Paper weight is printed as g/m² — grams for one square metre. An A4 is a sixteenth of an A0, so 0.0625 m²; at 80 g that is 5 grams. If a letter must stay under 25 grams, 80 g paper gives you five sheets.

70 g/m²8.73 g
80 g/m²9.98 g
100 g/m²12.47 g
120 g/m²14.97 g
160 g/m²19.96 g
200 g/m²24.95 g
250 g/m²31.19 g
300 g/m²37.42 g

The envelope it fits

C3324×458mm

Nearby cells

Same size, other resolutions

How to read this

Dimensions are in millimetres. Leftover fractions are dropped when folding, exactly as the standard says.
Pixel counts are rounded. Printers usually ask for 300 dpi.
The weight is the paper alone. Add the envelope and the ink separately.
Letter and Legal are defined in inches, so folding them does not preserve the √2 ratio.

Frequently asked questions

Q. How big is A3?

297×420 mm, or 11.69×16.54 inches.

Q. How many pixels at 72 dpi?

842×1191. That is 1 megapixels, or 2.9 MB uncompressed.

Q. What does one sheet weigh?

9.98 g on 80 g paper, 14.97 g on 120 g. A 25 g letter takes 2 of them.

Q. What envelope does it fit?

A C3 envelope, 324×458 mm.