C1 at 72 dpi — 1837×2599 pixels

648×917 mm at 72 dpi comes to 1837×2599 pixels. On 80 g paper one sheet weighs 47.54 grams.

millimetres: 648 × 917 mm
inches: 25.51 × 36.1 in
Pixels: 1837 × 2599 px
All the pixels together: 4.77 MP
Uncompressed, that is: 13.7 MB
Area: 0.5942 m²
Ratio of the sides: 1 : 1.415
Sheets in one letter: 0

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/m²41.6 g
80 g/m²47.54 g
100 g/m²59.42 g
120 g/m²71.31 g
160 g/m²95.07 g
200 g/m²118.84 g
250 g/m²148.55 g
300 g/m²178.26 g

The envelope it fits

C0917×1297mm

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 C1?

648×917 mm, or 25.51×36.1 inches.

Q. How many pixels at 72 dpi?

1837×2599. That is 4.77 megapixels, or 13.7 MB uncompressed.

Q. What does one sheet weigh?

47.54 g on 80 g paper, 71.31 g on 120 g. A 25 g letter takes 0 of them.

Q. What envelope does it fit?

A C0 envelope, 917×1297 mm.