A permille or per mille is a tenth of a percent or one part per thousand. It is written with the sign ‰, which looks like a percent sign (%) with an extra ₀ at the end. It is a stylized form of the three zeros in the denominator. 1‰ = 1% × 10^-1. For instance, 5‰ = 5/1000 = 0.005 = 0.5%

Permille notation is used in discussion of seawater salinity: the average salinity is 35‰.

When used to describe property taxation in the U.S., it is called the millage rate.

Example usage includes tunnel gradients and blood alcohol content.

Related units

• Percentage point
• Percent (%) 1 part in 100.
• Basis point (‱) 1 part in 10,000,
• Parts per million (ppm).
• Parts per billion (ppb).
• Parts per trillion (ppt).

Mathematical terminology

Промил | Promile | Promille | Promille | Pourmille | Prómill | Promille | パーミル | Promille | Promille | Promil | Промилле | Promile | Promille | Promille