There are 489 days until Pi Day 2028, on Tuesday, 14 March 2028 (Tuesday). This page counts down to the day, explains what it is and how it is observed, and gives the dates for 2026, 2027 and 2028.
Try the tool: Countdown Timer — count down to Pi Day 2028 live, second by second.
Try the tool: Days Until Calculator — count the days until any date, including Pi Day.
When is Pi Day 2028?
Pi Day 2028 is on Tuesday, 14 March 2028 — Tuesday. That is 489 days from today (11 November 2026) — 69 weeks and 6 days, or about 16.1 months.
How the countdown is worked out
The countdown is the number of days from today to the holiday's date: Tuesday, 14 March 2028 minus 11 November 2026 is 489 days. The count is in calendar days — it counts the days you have to wait, not the number of midnights, and it does not count today. The countdown timer recomputes the number live, second by second, and the days until calculator does the same calculation for any date you choose. If the holiday is in a different time zone from you, the day starts at a different moment — but the date is the date, and the countdown is in days, so the time zone does not change the number.
What is Pi Day?
Pi Day, 14 March, celebrates the mathematical constant π (pi), because the date 3/14 matches pi's first three digits, 3.14. It was first celebrated in San Francisco in 1988 and is now marked by maths departments worldwide.
How Pi Day is observed
Schools and universities hold maths events, pie-eating contests and pi-recitation competitions. It is an informal observance — and an excuse to eat pie.
How the date is worked out
Pi Day is on the same date every year — March 2028 — so the date never moves. The only thing that changes is the day of the week: Pi Day 2028 is a Tuesday, Pi Day 2026 is a Saturday.
Pi Day dates — 2026, 2027 and 2028
| Year | Date | Day of the week |
|---|---|---|
| 2026 | 14 March 2026 | Saturday |
| 2027 | 14 March 2027 | Sunday |
| 2028 | 14 March 2028 | Tuesday |
Pi Day 2028 in the calendar
Pi Day 2028 is the 74th day of 2028 — a leap year of 366 days — and it falls in ISO week 11 of the year. There are 292 days left in the year after it, and 31 days in March 2028. In the Northern Hemisphere it is spring; in the Southern Hemisphere the seasons are reversed.
The week number matters more than people think: in business and government across Europe, dates are often given as week numbers, and the week number finder gives the ISO week for any date. The day-of-year number is used in astronomy, in logistics and in some payroll systems. And the days-left figure is the useful one for planning the rest of the year: after Pi Day 2028 there are 292 days — 41 weeks — left in 2028.
Planning for Pi Day 2028
489 days is 16 months — plenty of time to plan. If Pi Day means travel, book it now: fares and hotels are usually cheapest months in advance, and the popular dates sell out. If it means time off work, put the request in early, especially if the holiday falls on a weekday — Tuesday is a working day for most people, so the day off needs to be booked. And if it means gifts or preparations, the countdown is long enough that a little planning each week is worth more than a rush in the last few days.
Pi Day 2028 falls on a Tuesday — a weekday — so most people need to take the day off to mark it properly. Book the time off early, especially if the holiday is one people travel for: the days around a weekday holiday are among the busiest travel days of the year, and the fares rise as the date approaches.
The countdown in other units
The countdown to Pi Day 2028 is 489 days — which is 69 weeks and 6 days, 11736 hours, 704,160 minutes, or about 16.1 months. Of those 489 days, 349 are weekdays and 140 are weekend days — so if you are counting working days, there are 349 of them left before the holiday. The days between dates calculator works out the same numbers for any two dates, and the business days calculator counts the working days excluding public holidays.
Pi Day around the world
As a global observance, this day is marked in most countries, but the way it is marked varies widely — and in many countries it is not a public holiday at all. The date is the same everywhere, because it is fixed by the Gregorian calendar or by an international agreement, but the customs are local. If you are planning around it with people in other countries, check whether it is a working day for them: a global observance is not the same as a global holiday.
Planning checklist for Pi Day 2028
| When | Task |
|---|---|
| Now | Put Tuesday, 14 March 2028 in your calendar, with a reminder three months before. |
| Three months before | Book travel and request time off, if Pi Day means either — fares are usually cheapest this far out. |
| One month before | Buy gifts or make preparations, and confirm plans with family. |
| One week before | Check the date once more — the date is fixed — and finalise the plan. |
More countdowns
If you are counting down to Pi Day, you may also be counting down to Christmas Day 2028, New Year's Day 2028, Easter Sunday 2028. And for the same holiday in another year, see Pi Day 2026 and Pi Day 2028.
Frequently asked questions
When is Pi Day 2028?
Pi Day 2028 is on Tuesday, 14 March 2028 (Tuesday).
How many days until Pi Day 2028?
There are 489 days until Pi Day 2028 from 11 November 2026.
What day of the week is Pi Day 2028?
Pi Day 2028 is a Tuesday.
When is Pi Day in 2026?
Pi Day 2026 is on Saturday, 14 March 2026 (Saturday).
Is Pi Day a public holiday?
Pi Day is widely observed, but whether it is a public holiday depends on the country — check your local calendar.
What is Pi Day?
Pi Day, 14 March, celebrates the mathematical constant π (pi), because the date 3/14 matches pi's first three digits, 3.14. It was first celebrated in San Francisco in 1988 and is now marked by maths departments worldwide.
How many weeks until Pi Day 2028?
There are 69 weeks and 6 days until Pi Day 2028 — 489 days in total.
How many working days are left until Pi Day 2028?
Count the weekdays between today and the holiday: the business days calculator does it, excluding weekends and the public holidays you add. The countdown in other units above gives the weekday count for Pi Day 2028.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - Holiday dates: TimeFlow's own holiday data (
data/holidays.ts). - TimeFlow's countdown timer and days until calculator — the live tools behind the countdown on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.