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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:

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

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

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

20 May 2024 is World Metrology Day

The theme for the 2024 World Metrology Day (on May 20) is "Sustainability," which raises awareness of the need for accurate measurements in the development of a



OWM Info Hour - Manual Weight Entries

Wed, Jun 5 2024, 1:00 - 2:00pm CDT (2:00 - 3:00pm EDT)
NIST Office of Weights and Measures will be conducting an informal discussion on NIST Handbook 44 Section 2.20 Scales


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