Letter at 720 dpi — 6120×7920 pixels

215.9×279.4 mm at 720 dpi comes to 6120×7920 pixels. On 80 g paper one sheet weighs 4.83 grams.

millimetres: 215.9 × 279.4 mm
inches: 8.5 × 11 in
Pixels: 6120 × 7920 px
All the pixels together: 48.47 MP
Uncompressed, that is: 138.7 MB
Area: 0.0603 m²
Ratio of the sides: 1 : 1.294
Sheets in one letter: 5

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/m²4.22 g
80 g/m²4.83 g
100 g/m²6.03 g
120 g/m²7.24 g
160 g/m²9.65 g
200 g/m²12.06 g
250 g/m²15.08 g
300 g/m²18.1 g

The envelope it fits

C4229×324mm

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 Letter?

215.9×279.4 mm, or 8.5×11 inches.

Q. How many pixels at 720 dpi?

6120×7920. That is 48.47 megapixels, or 138.7 MB uncompressed.

Q. What does one sheet weigh?

4.83 g on 80 g paper, 7.24 g on 120 g. A 25 g letter takes 5 of them.

Q. What envelope does it fit?

A C4 envelope, 229×324 mm.