Not only does it happen twice a year, but it's a holiday that celebrates Math! It happens once on March 14th (3.14 the decimal approximation) and then again on July 22 (22/7 the fractional approximation).

Download my Pi Day design for your smartwatch for free!

Pi Day is celebrated in Math classrooms all over the world twice a year on March 14th (3/14) and "Little Pi Day" on July 22nd (22/7).
Don't have your own Pi Day tshirt yet? Check out the shirts I designed on RedBubble. Order one for next Pi Day! 
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