U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Physical Measurement Laboratory

Weights and Measures

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.
Office of Weights and Measurers

Office of Weights and Measures (OWM)

OWM fulfills its mission through the following activities:

  • Standards Development
    • Partnering with the National Conference on Weights and Measures (NCWM)
    • Representing the U.S. in the International Organization of Legal Metrology (OIML)
  • Design and Delivery of Training
    • Metrology
    • Weights and Measures Law
    • Inspection Procedures
  • Technical Guidance
  • Publications and Outreach

Events

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

Awards

Contacts

General Inquiries:

Training Inquiries

Website Inquiries: