Pi Approximation Day 2017: When Is Pi Approximation Day? 🗓

When is Pi Approximation Day 2017? This year Pi Approximation Day is celebrated on a Saturday, July 22, 2017. In 2018, Pi Approximation Day is on Sunday, July 22, 2018.

July 22 is Pi Approximation Day. Also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (?).

Pi denotes the relationship between a circle’s circumference and its diameter and is denoted by the fraction 22/7 which calculates approximately to 3.14. One of the most widely recognized mathematical constant, ?, is an irrational number, the digits of which repeat in a random fashion and are never ending.

Countdown to Pi Approximation Day date is below, plus holiday history, celebration info, facts and holiday details.

When is Pi Approximation Day 2017? This year Pi Approximation Day is on Saturday, July 22, 2017.


People in countries that write their dates in the date/ month format celebrate Pi Approximation or Casual Pi Day on 22 July or 22/7. On the other hand, those who write their date in month/ date format celebrate Pi Day on March 14 (3/14 or 3-14) because the first three digits of the date correspond to the first three digits of pi – 3.14.

Below you will find all the details for Pi Approximation Day 2017 including, are banks open, is there mail delivery and related holiday information.

Is Pi Approximation Day a federal holiday?

No, Pi Approximation Day is not a federal holiday. There are ten annual US federal holidays on the calendar designated by the United States Congress. The following federal holidays are established by law:

  • New Year’s Day
  • Birthday of Martin Luther King, Jr. (Third Monday in January).
  • Washington’s Birthday (Third Monday in February)
  • Memorial Day (Last Monday in May)
  • Independence Day (July 4)
  • Labor Day (First Monday in September)
  • Columbus Day (Second Monday in October)
  • Veterans Day (November 11)
  • Thanksgiving Day (Fourth Thursday in November)
  • Christmas Day (December 25)

Is Pi Approximation Day a national holiday?

Pi Approximation Day is not a national holiday. Unlike many other countries, there are no ‘national holidays’ in the United States because Congress only has constitutional authority to create holidays for federal institutions. Most federal holidays are also observered as state holidays.

Is Pi Approximation Day a paid holiday?

No, Pi Approximation Day is not a paid holiday. The Fair Labor Standards Act (FLSA) does not require payment for time not worked, such as vacations or holidays (federal or otherwise).

Does the mail run on Pi Approximation Day?

Yes, there will be mail delivery on Pi Approximation Day. All post offices and federal offices of any kind will be open for the holiday, which means businesses and homes will receive mail. This also counts USPS and Fedex packages. See holiday schedule on USPS and Fedex. The only time mail is not being delivered is on federal holidays, which are listed above.

Are banks open on Pi Approximation Day?

Pi Approximation Day is a Fun holiday, which means all federal offices, courts and most banks will be open. While most banks are open, some banks can operate on their own schedules, so it may be best to check with your local branches. U.S. stock and bond markets like the New York Stock Exchange and NASDAQ will be open. Grocery stores and malls are reportedly open.

If your bank is closed, it is still possible to conduct general banking transactions via ATM, online banking or your mobile phone. Apps and websites are running though not all normal functions may be accessed for the holiday.

Are stores open on Pi Approximation Day?

On Pi Approximation Day, most stores, restaurants, shopping centers, and malls are open. There are no holidays on which all businesses are closed by law. However, some stores may have shortened or extended holiday hours for the day. Stores may be operating on holiday schedule with limited or reduced hours of operation. Some businesses may be closed on in order to give their employees the day off. For restaurants, stores and other establishments specific to your area, you will have to check with the individual business.

Shop Pi Approximation Day Gifts on Amazon

Pi Approximation Day 2017

Holiday: Pi Approximation Day
Date: July 22, 2017
Weekday: Saturday
Holiday Type: Fun
Pi Approximation Day 2018: Sunday, July 22, 2018
Pi Approximation Day 2019: Monday, July 22, 2019
Pi Approximation Day 2020: Wednesday, July 22, 2020

Fun Holiday Fact

Did you know …that the sequence 123456 does not occur in the first million digits of pi?

How To Celebrate Pi Approximation Day

Celebrate the day with lots of pie – remember a pie is also a circle so not only are you learning something about math, but also having fun while eating it!

Have a pi contest. Whoever knows the most digits in the number takes home a pie.

Disclaimer: We may get a commission from Amazon sales.

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