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Office of Weights and Measures

NIST OWM establishes uniformity, equity, SI use, and traceability in weights and measures by advancing national and international legal metrology standards, procedures, capabilities, and training.

The NIST Office of Weights and Measures (OWM) works to ensure that consumers get what they pay for, and sellers get fair payment for the goods and services they sell, by promoting a uniform and technically sound system of weights and measures. This, in turn, promotes consumer confidence and helps ensure fair competition for U.S. commerce that spans from local business operations to a global scale. 

OWM's programs work to ensure:

To learn more about OWM and its roles and responsibilities, click About Us.

Originally established in 1836 as the “Office of Construction of Standard Weights and Measures”, OWM remains the oldest office at NIST. For more information, see A Brief History of OWM.

Projects and Programs


Busting Myths about the Metric System

This year will be the 45th anniversary of the Metric Conversion Act, which was signed on December 23, 1975, by President Gerald R. Ford. Normally, we celebrate

Newsletter Articles and Updates



5902 Measurement Assurance Basics

Thu, Apr 25 2024, 2:00 - 4:00pm EDT
This session will cover the requirements in NIST Handbook 143 (essentially ISO/IEC 17025) on Measurement Assurance

5859 Fundamentals of Metrology

Mon, May 13 - Fri, May 17 2024
The 5-day Fundamentals of Metrology seminar is an intensive course that introduces participants to the concepts of


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