Weights and Measures Day

Weights and Measures Day is a global holiday dedicated to the system of weights and measures. This standardization has facilitated international trade without significant challenges. It is celebrated annually on May 20.

History

The history of Weights and Measures Day dates back to 1875, when the International Treaty on the Meter was signed. This treaty established a unified system of weights and measures, significantly improving economic relations between countries by eliminating the difficulties of converting one country’s units of measurement to another’s.

Despite the standardization, the English system of measurements is still used in some parts of the world, primarily in the U.S. and the U.K. This system includes units such as feet (for length) and pounds (for weight). However, the globally accepted metric system, which includes meters, kilograms, and other units, can also be used freely in these countries.

Interesting Facts

• The International System of Standard Measures and Magnitudes was adopted in Paris, France.
• Researchers believe that the first universal system of measurement was created in ancient India about 5,000 years ago.
• The metric system, which we use today, is based on multiples of 10. This makes it very convenient: for example, 1 cm = 10 mm, 1 L = 1000 ml.

How to Celebrate

Learn more about the metric system of weights and measures on this day. Try measuring the objects around you: find out how many liters a pot holds or how long your table is.

Share the holiday on social media. Ask others whether they use the metric system or the English system more often.

When is Weights and Measures Day in 2025?

Weights and Measures Day is observed on May 20 each year.

Observations