Standards Index · JCGM/BIPM

BIPM SI Brochure, 9th edition (2019)

The International System of Units (SI)

OFFICIAL SOURCE ↗ FIND MENTIONS IN THE ATLAS

Status: Current
Publisher: JCGM/BIPM
Year: 2019
Discipline: Standards & Units

What it covers

The defining document of the SI: the seven defining constants, base and derived units, prefixes and usage rules. Ninth edition with rolling updates (v4.01, 2026; the 2022 update added the ronna/quetta prefix family). Freely available.

Summary written for this index — consult the official text for normative requirements.

Related standards

ISO 80000-1:2022 Quantities and units — Part 1: General Current OIML D 8:2004 Measurement standards — Choice, recognition, use, conservation and documentation Current NIST SP 811:2008 Guide for the Use of the International System of Units (SI) Current NIST SP 330:2019 The International System of Units (SI) Current