Pagliacci Pi Day 2025. Signifying the ratio of the circumference of any circle to its diameter, pi plays a pivotal role in varied aspects of mathematics and science. While you enjoy your pie with a side of math, check out our roundup of interesting pi facts on the blog today.
Pi day in 2025 is on friday, march 14 (second friday of march). Check out the countdown below to find out exactly how long we have to wait for some 3.14159 goodness.