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INTERNATIONAL DAY

World Metrology Day

World Metrology Day is a global nod to something worth celebrating no matter which map you grew up with.

MAY20
Thursday, May 20Every year on May 20
 days to go
Roots
Commemorates the Metre Convention of May 20, 1875; observed annually since 2000
Vibe
A mix of science and everyday life
Hashtag
#WorldMetrologyDay
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Ways to celebrate

Small, doable ways to celebrate World Metrology Day.

  • Read or watch something made outside the U.S. today.
  • Cook a dish from a country you've been curious about.
  • Donate to an international organization doing good work.
  • Learn one word in a language you don't speak.
  • Send a message to a friend who lives elsewhere.

Make it your kind of celebration

  • Family

    Eat, watch, or listen to something from another country tonight.

  • Kids

    Pick a country to learn about this week — flag, food, language, one famous person.

  • Couples

    Plan a trip — real or imagined — to someplace you've never been.

  • Office

    Celebrate a team member's heritage — food, holiday, tradition.

  • School

    Tie the day into a geography, language, or world history unit.

  • Community

    Support an international nonprofit with a local presence.

  • Just me

    Read long-form journalism from outside the U.S. today.

Plan ahead

World Metrology Day is observed on May 20 every year. Here is where it lands for the next ten years, handy for planners, marketers and party people.

2026Wed, May 20this year
2027Thu, May 20
2028Sat, May 20
2029Sun, May 20
2030Mon, May 20
2031Tue, May 20
2032Thu, May 20
2033Fri, May 20
2034Sat, May 20
2035Sun, May 20
2036Tue, May 20

Add to my calendar (repeats yearly)

Fast facts

Over 100Countries participate annually

The story

World Metrology Day marks a significant occasion to recognize the essential role that measurement plays in our everyday lives. Commemorating the Metre Convention signed on May 20, 1875, and observed annually since 2000, it promotes awareness of the science of measurement and its impact on various sectors, including science, industry, and trade. With a motto that changes every year, the day serves to educate the public about the importance of accurate measurements and the contributions of metrology to safety and quality.

Read the full story

The observance is celebrated globally, with events ranging from workshops, conferences, and educational activities that highlight the importance of metrology. Each year's theme focuses on developments in measurement science and technology. By engaging communities, organizations aim to inspire the next generation of scientists and engineers.

In the United States, the National Institute of Standards and Technology (NIST) plays a pivotal role in setting standards for measurements. From ensuring the accuracy of weights and measures to developing new technologies, NIST's work underlines the critical nature of metrology in everyday activities, including trade and manufacturing. As we reflect on the importance of measurement, it is essential to consider how it underpins everything from cooking to technological advances.

As we celebrate World Metrology Day, we invite everyone to explore the fascinating world of measurement. Whether it’s through education, community events, or simply appreciating the standards that ensure our products and services are reliable, each of us can contribute to a greater understanding of metrology. The day is a reminder that measurement is not just a technical field, it is a fundamental aspect of our lives.

Did you know?

01

The Metric System

The metric system was adopted in France in 1795.

02

NIST's Role

NIST was established in 1901 to develop measurement standards.

03

International System of Units

The SI system is used by nearly all countries worldwide.

04

Measurements in Space

Precise measurements are essential for space exploration and navigation.

05

Trade Impact

Inaccurate measurements can lead to significant financial losses in trade.

06

Historical Measurements

Ancient civilizations used various measurement systems, impacting their trade.

07

Future of Metrology

Advancements in technology are continually shaping the future of measurement.

Around the world

Every culture celebrates a little differently.

  • USNational StandardsNIST leads metrology efforts, ensuring accurate measurements in trade and science.
  • DETechnical AdvancementsGermany is known for its precise engineering and metrology innovations.
  • FRHistorical RootsFrance was pivotal in establishing the metric system, influencing global standards.
  • GBMeasurement in IndustryThe UK emphasizes metrology in manufacturing and quality assurance.
  • CNEmerging TechnologiesChina's rapid growth relies on precise measurements in technology and production.
  • JPQuality ControlJapan integrates metrology into its commitment to quality and precision.

Keep the party going

See the calendar
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