Mole Day Celebrations

Mole day is celebrated annually on October 23 from 6:02 a.m. to 6:02 p.m., Mole Day commemorates Avogadro’s Number (6.02 x 1023), which is a basic measuring unit in chemistry. National Mole Day Foundation is your go-to source for all things Mole Day. Jokes, history, themes, store—they’ve got it all. Don’t miss the “Fabulous Mole Projects” gallery.