How is Mole Day calculated?

This event is observed every year on 23 October.

When is Mole Day 2026?

Name: Mole Day
Start: 2026-10-23
End: 2026-10-23
Location: Worldwide

Friday, 23 October 2026

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.

Add to your calendar

Download an iCalendar file for Mole Day and add it to your calendar app.

Add to calendar

Frequently asked questions

When is Mole Day 2026?: Mole Day 2026 is on Friday, 23 October 2026.
What day of the week is Mole Day 2026?: It falls on Friday.
How is Mole Day calculated?: This event is observed every year on 23 October.