C7 at 720 dpi — 2296×3231 pixels

81×114 mm at 720 dpi comes to 2296×3231 pixels. On 80 g paper one sheet weighs 0.74 grams.

millimetres: 81 × 114 mm
inches: 3.19 × 4.49 in
Pixels: 2296 × 3231 px
All the pixels together: 7.42 MP
Uncompressed, that is: 21.2 MB
Area: 0.0092 m²
Ratio of the sides: 1 : 1.407
Sheets in one letter: 33

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/m²0.65 g
80 g/m²0.74 g
100 g/m²0.92 g
120 g/m²1.11 g
160 g/m²1.48 g
200 g/m²1.85 g
250 g/m²2.31 g
300 g/m²2.77 g

The envelope it fits

C6114×162mm

Nearby cells

Same size, other resolutions

Same resolution, other sizes

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 C7?

81×114 mm, or 3.19×4.49 inches.

Q. How many pixels at 720 dpi?

2296×3231. That is 7.42 megapixels, or 21.2 MB uncompressed.

Q. What does one sheet weigh?

0.74 g on 80 g paper, 1.11 g on 120 g. A 25 g letter takes 33 of them.

Q. What envelope does it fit?

A C6 envelope, 114×162 mm.