National Pi Day 2024: Save on apple, cherry, or pizza pie.

National Pi Day is Thursday, March 14, when the ratio of a circle's circumference to its diameter is celebrated.

PiDay.org identifies the number as π, the first letter of the Greek word "perimetros," meaning "circumference."

Pi, usually rounded to 3.14, can go on forever. According to Guinness World Records, the University of Applied

Sciences in Switzerland estimated the most accurate Pi value in August 2021 at 62,831,853,071,796.

 Pi Day is about more than numbers. Finding amazing bargains on pie, pizza pie, and other delicacies is also important

 Looking for a good deal on the nation's nerdiest day? USA TODAY covers you.

Celebrate National Pi Day without becoming a math or science expert. Former scientist Larry Shaw hosted the first

 Pi Day at the Exploratorium in San Francisco on March 14, 1988, with fruit pies and tea.

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