Pi Day: March 14, 2025
Pi Day: March 14, 2025
In 2009, the U.S. House of Representatives passed H.Res.224 officially designating March 14 as "National Pi Day," recognizing the date as an approximation of the mathematical constant Pi (3.14) and encouraging schools to celebrate the day with educational activities related to mathematics and Pi.
Pi is a never-ending number representing the ratio of a circle's circumference to its diameter, approximately equal to 3.14. It's a mathematical constant because it's the same for every circle.
Key Stats
Source: 2023 American Community Survey (ACS), 1-year estimates
Note: The table above is modified to hide the margin of error columns and highlight in yellow the computer, engineering, and science occupations. Click on the image for the full table. Click on the Geography tab for other geographies such as “State,” then “All States in United States.”
Note: The cropped table above contains detailed occupations that use “pi,” such as mathematicians, statisticians, engineers, and architects. Click on the image for the full table.
More Stats
Source: Quarterly Financial Report (QFR) 2010-2024
Source: Quarterly Services Survey (QSS) 2007-2024
Source: 2022 Annual Business Survey (ABS) Program
- 5413: Architectural, Engineering, and Related Services
- 5414: Specialized Design Services
- 5415: Computer Systems Design and Related Services
- 5416: Management, Scientific, and Technical Consulting Services
- 5417: Scientific Research and Development Services
Source: 1978-2022 Business Dynamics Statistics (BDS)
Source: 2022 County Business Patterns (CBP)
Source: 2022 Nonemployer Statistics (NES)
Various U.S. Census Bureau products related to Science, Technology, Engineering and Math (STEM) by date of release: