Pi Day is celebrated on March 14 every year. This holiday honors the mathematical value π (rounded to 3.14). Physicist Larry Shaw founded the holiday in 1988, choosing March 14 (or 3/14) was chosen for the date. Archimedes of Syracuse (287–212 BC), one of the founding fathers of mathematics, first calculated the value of pi.

An ancient constant in mathematics, Pi is the ratio of a circle's circumference to its diameter. Its value lies at approximately 3.14159265. It is an irrational number, meaning that you cannot express it as a whole number, fractional number, or repeated pattern. It will continue infinitely without pattern or repetition when written out on paper. This makes for one awesome mathematical property!

How to Celebrate Pi Day

Celebrate Pi Day with a mathematical geek in your life! Because pi and pie sound alike, many pie and pizza shops offer deals. You could also make a selection of sweet and savory pies to share with friends or take to work. Since pi deals with circles, you could also take the kids out for a ride on a Ferris wheel. Don't forget to post your culinary creations or pictures on social media with the hashtag #PiDay!

How many days until pi day?

If you want to know how many more days, then here is your countdown to pi day

Based on Central Standard Time US/Canada

Upcoming dates for pi day

When is pi day 2024?

Thursday, March 14, 2024

When is pi day 2025?

Friday, March 14, 2025

When is pi day 2026?

Saturday, March 14, 2026

When is pi day 2027?

Sunday, March 14, 2027

When is pi day 2028?

Tuesday, March 14, 2028

When is pi day 2029?

Wednesday, March 14, 2029

When is pi day 2030?

Thursday, March 14, 2030

When is pi day 2031?

Friday, March 14, 2031

When is pi day 2032?

Sunday, March 14, 2032

When is pi day 2033?

Monday, March 14, 2033

When is pi day 2034?

Tuesday, March 14, 2034

Related Holidays

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