News and Updates

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NIST unit conversion card ruler measures an autumn oak leaf

Classroom-Ready: NIST Releases Updated Metric Ruler and Conversion Card

July 7, 2025

The NIST Metric Program provides a wide range of educational materials to help students learn to apply the International System of Units (SI), commonly known as...

C-RMAP 2025: “That’s A Wrap!”

July 7, 2025

In early June, over 115 metrologists from state, county, and federal government laboratories gathered with manufacturing and industry laboratory metrologists in...

BIPM 150th Anniversary Standout Poster

May 23, 2025

World Metrology Day (20 May 2025) marked the sesquicentennial, or 150th anniversary, of the Meter Convention. NIST and the Office of Weights and Measures (OWM)...

OWM Welcomes Undergraduate Researchers

March 27, 2025

The Office of Weights and Measures (OWM) welcomes Yoon Thwel, a spring Professional Research Experience Program (PREP) intern and Matthew Kenzinger, a visiting...

Consumer examining bottle labels in grocery store

Best Practices for Uniform Unit Pricing: An Update to NIST SP 1181 and NIST Handbook 130 Regulations

December 13, 2024

To help shoppers everywhere get the best value for their money, the NIST Office of Weights and Measures (OWM) convened a unit price working group comprised of...

Metric Week 2024: Measure Up with Metric Education

October 2, 2024

National Metric Week ( October 6 to 12, 2024) is an opportunity to draw attention to the educational and economic benefits of metric system measurements...

Dinelka Jagada tallies team scores during NIST Metric Est Game.

2024 NIST Internship Reflections

October 1, 2024

During the summer of 2024, the NIST Physical Measurement Laboratory’s ( PML) Office of Weights and Measures ( OWM) hosted two undergraduate students through the...

Info Hours Presented by NIST OWM: 2024 Series Successfully Completed!

October 1, 2024

This year, NIST OWM launched a new series of Information Hours, aka “Info Hours,” as an informal forum for our customers and stakeholders to engage in...

DYK: NIST OWM Fun Facts

October 1, 2024

DYK: The Office of Weights and Measures (OWM) is the oldest office at NIST? NIST OWM’s principal mandate to “ fix the standard of weights and measures” is...

Webinar image with hands over laptop in background

Recorded Webinars for Weights and Measures Available On-Demand!

June 26, 2024

OWM Recorded Webinars and Training Videos OWM develops and delivers a series of recorded webinars and training videos covering a wide range of legal metrology...

Update on NIST Activities for EVSE

June 26, 2024

NIST OWM is striving to assist the weights and measures community meet the new technical challenges and demands of America’s continued transition to E-mobility...

A person in a black shirt works on a mechanical device in a lab setting.

NIST Brings Mass Measurement to the Masses

June 12, 2024

NIST has delivered a portable and highly accurate instrument for measuring mass to the U.S. Army, marking the first time in the U.S. that this technology is...

Metric Week 2023: Seven Days of SI Fun

September 20, 2023

National Metric Week (October 8 to 14, 2023) is an opportunity to underscore the usefulness of metric system measurements, formally known as the International...

NIST Metric Kitchen: Educational Website Launched

March 31, 2023

The NIST Office of Weights and Measures (OWM) Metric Program invites you to see what’s cooking in the NIST Metric Kitchen, a new educational website that...

SI Prefix Progress

January 4, 2023

In December 2022, the BIPM SI Brochure (9 th Edition, December 2022, V2.01) was published to include the four new International System of Units (SI) prefixes...

In-Person Training for Mulch and Soil Testing at the WWMA Annual Meeting

September 27, 2022

Now that we are attending meetings in-person again, this presents an opportunity for OWM staff to provide some of our training directly to our stakeholders...

Graphic Image of Weights and Measurements Featured Collection

Discover NIST Education Resources!

March 27, 2022

The National Institute of Standards and Technology (NIST) invites learners of all ages to explore and discover a wide variety of Science, Technology...

World Metrology Day Poster Graphic Image

Celebrate World Metrology Day on May 20

March 26, 2022

“World Metrology Day is an annual celebration of the signature of the Meter Convention on 20 May 1875 by representatives of seventeen nations. The Convention...

Updates to Fundamental Constants Reflect Redefinition of International System of Units

December 16, 2021

The CODATA Task Group on Fundamental Constants recently produced its 2018 update of a self-consistent set of internationally recommended values of the basic...

Person holding wallet card showing the values of fundamental constants being used for revising the International System of Units, the modern metric system.

Bringing the World Closer to Revised Measurement System, Scientists Update Four Key Fundamental Constants

October 23, 2017

Paving the way for transforming the world’s measurement system, an international task force has determined updated values for four fundamental constants of...

NIST's Newest Watt Balance Brings World One Step Closer to New Kilogram

June 21, 2016

A high-tech version of an old-fashioned balance scale at the National Institute of Standards and Technology (NIST) has just brought scientists a critical step...

SI Superheroes Return with Another Weighty Adventure

February 2, 2016

The nefarious Major Uncertainty has kidnapped Monsieur Kilogram, putting the world's measurements of mass in jeopardy. As the world spirals into " Mass Hysteria...

The League of SI Superheroes is Running Out of Time!

May 29, 2015

The League of SI Superheroes is back! Working from their not-terribly-secret HQ at the National Institute of Standards and Technology (NIST), the cartoon heroes...

Introducing the League of SI Superheroes: The New Champions of Metric

October 6, 2014

To celebrate Metric Week (Oct. 5-11), the National Institute of Standards and Technology would like to introduce you to the League of SI Superheroes. The League...

New Value for the Planck Constant May Hasten Electronic Kilogram

January 14, 2014

After two years of difficult and meticulous work examining, refurbishing, and testing the aging workhorse watt balance called NIST-3, PML researchers have used...

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