3-10-2026 5:35pm

Pi Day: Celebrating Math, Science, and STEM on March 14

Donnella Tilery Editor

Every year on March 14, communities across the country celebrate Pi Day, a fun nod to the mathematical constant π (3.14). The U.S. Census Bureau highlights this day as an opportunity to recognize the importance of math, science, and STEM education — fields that shape everything from technology and engineering to research and design.

Why Pi Day Matters

Pi (π) represents the ratio of a circle’s circumference to its diameter, a number used in countless scientific and engineering applications. Its first three digits — 3.14 — inspired the March 14 celebration. In 2009, the U.S. House of Representatives officially supported the designation of Pi Day, encouraging schools and communities to promote math learning and STEM activities.

STEM by the Numbers

The Census Bureau uses Pi Day to spotlight data about STEM fields and the people who work in them:

STEM occupations include mathematicians, statisticians, engineers, computer scientists, and researchers.
According to the American Community Survey, millions of Americans work in STEM roles, with employment projected to grow faster than many other fields.
Census data also highlights earnings, gender representation, and industry trends across STEM careers.

These insights help educators, policymakers, and communities understand how STEM fields are evolving — and where opportunities are growing.

STEM Industries Driving Innovation

The Census Bureau’s economic surveys show steady activity in industries that rely heavily on math and science, including:

Computer systems design
Scientific research and development
Engineering and architectural services
Management and technical consulting

These sectors play a major role in job creation, business growth, and technological advancement nationwide.

Across the country, Pi Day has become a fun tradition — from classroom activities and math challenges to pie‑themed events. The Census Bureau encourages educators to use the day to spark curiosity and highlight the real‑world impact of math and science.

Learn More

The full Pi Day feature, along with STEM‑related data tools and stories, is available through the U.S. Census Bureau. It’s a great resource for teachers, students, and anyone interested in how math shapes our world.