U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Metrology

Weights & measures

Overview

NIST works to improve the accuracy of measurements, enhance consumer protection, foster fair competition, and facilitate economic growth and trade through technical activities that promote uniformity in national and international legal metrology laws, regulations, standards, test procedures and enforcement.

Pirate flag with grave

TAKING MEASURE: Pirates of the Caribbean (Metric Edition)
lumber

Making Sure that Lumber Measures Up
Georgia Harris at UPSRJ in Querétaro, Mexico

TAKING MEASURE: Teaching Metrology Abroad as a Fulbright Specialist

Get What You Pay For: At the Grocery Store

News and Updates

Events

5708 Contract Review

Thu, Mar 11 2021, 2:00 - 4:00pm EST
This 2-hour webinar will introduce the fundamentals of contract review that are necessary to meet customer expectations

Industry Impacts

A streaked image of a taxi and a dark car driving in Times Square, New York City street at night.

Fare Standards for Rideshare Services

To calculate fares, app-based ride services such as Lyft and Uber don’t use traditional taxi meters, but instead combine data from GPS and cellular networks to

Projects and Programs

Doc3

International System of Units (SI)

The International System of Units (SI) provides definitions of units of measurement that are widely accepted in science and technology and which set measurement

Publications

Redefining the kilogram and other SI units

Author(s)
Stephan Schlamminger
Units are at the heart of science and technology. Most measurements require units to express their result. The International System of Units (SI) provides a

Report of the 104th National Conference on Weights and Measures

Author(s)
Yvonne A. Branden, Tina G. Butcher, Richard A. Harshman, Lisa Warfield, Gloria D. Lee, John W. Barton
The 104th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 14 - 18, 2019, at the Hyatt Regency Milwaukee Hotel, Milwaukee

Awards