How many days until Pi Day?
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Upcoming Pi Day dates
Why Pi Day is on March 14
Pi Day is March 14, written 3/14 in US date format, matching the first three digits of π. It was first marked at San Francisco's Exploratorium in 1988 and recognised by the US House of Representatives in 2009. It doubles as Albert Einstein's birthday, and — for those who prefer their dates unambiguous — July 22 is marked as Pi Approximation Day, since 22/7 is a closer fraction than 3.14.
Planning ahead
It is largely an excuse for pie in classrooms and engineering offices. If you want a genuinely satisfying fact for the day: 39 digits of π are enough to calculate the circumference of the observable universe to within the width of a hydrogen atom, which makes the memorisation contests charmingly unnecessary.
About this countdown
Pi Day falls on March 14 each year. This page counts whole days from today (in your timezone) to the next Pi Day, and updates automatically. Need the gap between any two dates instead? Use the full Age Calculator.
FAQ
When is Pi Day?
Pi Day falls on March 14 each year.
How many days until Pi Day?
This page shows the exact number of days remaining until the next Pi Day, and it updates automatically each day.
Why is Pi Day on March 14?
Because 3/14 in month/day format matches 3.14, the first three digits of π. Countries writing dates day/month sometimes mark 22/7 instead, as 22÷7 approximates π.
How many digits of pi are actually useful?
Very few. NASA uses 15 decimal places for interplanetary navigation, and 39 digits would size the observable universe to atomic precision.
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