Pi Day 2027 is Sunday, 14 March 2027
There are 207 days between 19 August 2026 and Pi Day 2027, which falls on Sunday, 14 March 2027. That is 29 weeks and 4 days, or 139 working days once Saturdays, Sundays and the US federal holidays in between are taken out — the figure that matters if you are counting delivery lead time or a work schedule rather than sleeps. The date is 2027-03-14 in ISO form and 3/14/2027 in the US format, it falls in ISO week 10 of 2027, and it is day 73 of 365.
How the date of Pi Day is decided
Pi Day is 14 March, written 3/14 in US date format.
That makes it a fixed date: the same day of the same month every year, so it lands on a different weekday each time. In 2027 it is a Sunday.
Pi Day is an observance rather than a federal holiday. Offices, banks and schools stay open unless an individual employer chooses otherwise, and it counts as an ordinary business day in every calculator here. Only the eleven federal holidays are treated as non-working days — the list and the reasoning are on the holiday sources page.
Pi Day in the years after 2027
| Year | Date | Day | Countdown |
|---|---|---|---|
| 2028 | 14 March 2028 | Tuesday | Pi Day 2028 |
| 2029 | 14 March 2029 | Wednesday | Pi Day 2029 |
| 2030 | 14 March 2030 | Thursday | — |
The date does not move, but the weekday does — which is why the same holiday gives a long weekend in some years and not others.
Every convention used above — whether the start date counts, how month ends are clamped, which holidays close an office — is written out on the methodology page, including how we count the 139 working days above.