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https://www.nist.gov/pml/owm

National Institute of Standards and Technology
National Institute of Standards and Technology
Physical Measurement Laboratory

Office of Weights and Measures

OWM's mission is to establish uniformity, 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. 

SeeAbout OWM andOWM Fun Facts to learn more about our programs, history, and uniqueResponsibilities and Authorities.

OWM Quick Start: Find It Here!

Events

Info Hour teaser image

2087 Lab Metrology Info Hour – Advanced Mass Metrology LAP Problems Training

Tue, Dec 16 2025, 1:00 - 2:00pm EST
Are you ready to start practicing Advanced Mass weighing designs in your laboratory for customers? Whether you’re
Fundamentals of Metrology

2055 Fundamentals of Metrology

Mon, Jan 26 - Fri, Jan 30 2026
The 5-day Fundamentals of Metrology seminar is an intensive course that introduces participants to the concepts of
Webinar image with hands over laptop in background

2058 Document Control and Record Keeping

Thu, Feb 12 2026, 2:00 - 4:00pm EST
Managing controlled documents and records are essential calibration laboratory processes. This 2-hour webinar will
Mass Metrology Thumbnail

2057 Mass Metrology Seminar

Mon, Mar 2 - Fri, Mar 13 2026
The two-week Mass Metrology Seminar is a "hands-on" seminar that incorporates approximately 30 percent lectures and 70

Projects and Programs

Public parking along the street with charging points for electric vehicles

Electric Vehicle Supply Equipment (EVSE) Program: Standards, Services, and Training

Ongoing
Weights and measures authorities in each U.S. state and local jurisdiction are responsible for the testing and official inspection of electric vehicle (EV) chargers, specifically the measurement devices that deliver electricity as fuel within commercial EV chargers. These devices are commonly
group photo taken at NCWM 2023 Annual Meeting; Craig VanBuren, Don Onwiler, and Mahesh Albuquerque of NCWM, Laurie Locascio and Katrice Lippa of NIST, Gene Robertson of NCWM, David Sefcik

NIST OWM – NCWM: An Enduring Partnership

Ongoing
The National Conference on Weights and Measures (NCWM) was first held as the “First Annual Meeting of Sealers of Weights and Measures of the United States” in 1905 and as part of the National Bureau of Standards (NBS), which was the predecessor non-regulatory agency to the National Institute of
OWM Laboratory Metrology Training for mass metrology

OWM Training Program: Metrology, Metrication, and More!

Ongoing
OWM offers a variety of in-person, online, and "blended" training classes and materials that provide guidance instruction on national legal metrology standards, weights and measures field inspection procedures, and laws and regulations related to packaging and labeling. OWM provides technical
Map of RMAP regions

Regional Measurement Assurance Program (RMAP): Training for the States Across the U.S.

Ongoing
The Laboratory Metrology Regional Measurement Assurance Program (RMAP) operates within the broader OWM's Training Program and is integral to the successful training of the U.S. state legal metrology laboratory network and the weights and measures community. Each year, OWM laboratory metrology staff

Newsletter Articles and Updates

hand holding a cellphone showing four different apps

Legal Metrology Meets the Digital Age

The days when a telephone was just a device to make phone calls are long gone. Nowadays, almost everybody has a smartphone with the capability to use it as a
2025 C-RMAP attendees

C-RMAP 2025: “That’s A Wrap!”

In early June, over 115 metrologists from state, county, and federal government laboratories gathered with manufacturing and industry laboratory metrologists in
OWM Info Hours Announcement Banner

OWM Info Hours Update

OWM continues to host a series of Information Hours, or "Info Hours," to feature current weights and measures, laboratory metrology, or documentary standard
electric car at charging station

EVSE Metrology Trainings are a Go!

OWM is ramping up a new series of metrology training for the testing and verification of electric vehicle supply equipment (EVSE). This August, in conjunction

Blogs

Fisheye view of grocery store shelves packed with coffee products.

Weighing Your Purchases: How New Laws May Help You Become a Savvier Online Shopper

When you buy something by weight or volume, you want to get what you pay for. And we’re helping to make sure that happens — whether you shop online or in a
Graphic with text that reads "Weights and Measures" and shows fish at a seafood counter, a bag of mulch, a grocery checkout, and a gas pump. Color scheme is orange and purple.

4 Places Weights and Measures Help You Get What You Pay For

Here at NIST, we are committed to making sure you get what you pay for when buying something based on weight or measure, such as food or fuel.
representation of weights and measures at a packaging plant, a manufacturing plant and a supermarket.

U.S. Weights and Measures Week: Measuring Up to the New Normal

Each year during national Weights and Measures Week (March 1 to 7), we celebrate the contributions made by the weights and measures community to ensure accuracy
Elizabeth Gentry holding a kilogram test weight in the weights and measures training lab

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

Awards

Tina Butcher

2024 National Conference on Weights and Measures (NCWM) Lifetime Achievement Award - Tina Butcher

The officers and members of the National Conference on Weights and Measures (NCWM) hereby express our greatest respect and appreciation to

2023 - B. Stephen Carpenter Award---Ralph Richter

For leadership in international legal metrology standards to ensure a fair and equitable marketplace for global industrial commodities.
David Sefcik (center) accepting his award from NCWM Chair-elect Gene Robertson (at the podium), NCWM Chair Mahesh Albuquerque (left) and NIST Director Laurie Locascio (right).

2023 NCWM Outstanding Contributions Award - David Sefcik

David Sefcik of the NIST OWM received the 2023 NCWM Outstanding Contributions Award for his service as a co-organizer of the 2022 NCWM-NIST

Contacts

General Inquiries:

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