Pi Approximation Day is celebrated on July 22nd each year. The holiday celebrates the mathematical constant Pi, representing the ratio of a circle’s circumference to its diameter. Most people know the first few digits of Pi (3.14) but don’t realize it’s an irrational number, meaning it continues infinitely after the decimal. Although Pi doesn’t have an end digit, it's been said to go on for over a trillion digits.

People began using Pi as early as 250 BC. The ancient mathematicians Archimedes of Syracuse and Zu Chongzhi brought attention to the concept by calculating the fraction 7/22 to its truest form. Pi is now used throughout mathematics and remains one of the most recognizable mathematical constants in the field today.

How to Celebrate Pi Approximation Day

You don’t have to be a math whiz to celebrate Pi Approximation Day. Most people show their appreciation for the mathematical constant by baking a pie or pizza. Some even try to memorize as many numbers in Pi as possible, even though it goes on for eternity. If you feel like sharpening your math skills, try solving equations with Pi to celebrate Pi Approximation Day. As long as Pi or pie is involved, you can never go wrong when you celebrate #PiApproximationDay

How many days until pi approximation day?

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

Based on Central Standard Time US/Canada

Upcoming dates for pi approximation day

When is pi approximation day 2022?

Friday, July 22, 2022

When is pi approximation day 2023?

Saturday, July 22, 2023

When is pi approximation day 2024?

Monday, July 22, 2024

When is pi approximation day 2025?

Tuesday, July 22, 2025

When is pi approximation day 2026?

Wednesday, July 22, 2026

When is pi approximation day 2027?

Thursday, July 22, 2027

When is pi approximation day 2028?

Saturday, July 22, 2028

When is pi approximation day 2029?

Sunday, July 22, 2029

When is pi approximation day 2030?

Monday, July 22, 2030

When is pi approximation day 2031?

Tuesday, July 22, 2031

When is pi approximation day 2032?

Thursday, July 22, 2032

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