Factors and Prefixes for Forming Decimal Multiples of SI Units

Decimal multiples and sub-multiples of the SI units are formed by means of the prefixes given in the following table, which represent the numerical factors shown.

For more information on SI practice, the reader is referred to the following publications:

Metric Practice Guide, published by the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428.

ISO International Standard 1000. This publication covers the rules for use of SI units, their multiples and sub-multiples. It can be obtained from the American National Standards Institute 25 West 43rd Street, New York, NY 10036.

The International System of Units, Special Publication 330 of the National Institute of Standards and Technology—Gaithersburg, MD 20899.