How is Mole Day calculated?

This event is observed every year on 23 October.

When is Mole Day 2025?

Name: Mole Day
Start: 2025-10-23
End: 2025-10-23
Location: Worldwide

Thursday, 23 October 2025

Mole Day is a celebration of chemistry observed on 23 October, honouring Avogadro's number (6.02×10²³) and encouraging interest in science through educational activities and events.

Frequently asked questions

When is Mole Day 2025?: Mole Day 2025 is on Thursday, 23 October 2025.
What day of the week is Mole Day 2025?: It falls on Thursday.
How is Mole Day calculated?: This event is observed every year on 23 October.