Fibonacci Day 2025

Fibonacci Day uses the month and day notation 11/23 to echo the opening numbers of the Fibonacci sequence: 1, 1, 2, 3.

Frequently asked questions

When is Fibonacci Day 2025?

Fibonacci Day 2025 is on Sunday, 23 November 2025.

What day of the week is Fibonacci Day 2025?

It falls on Sunday.

How is Fibonacci Day calculated?

This event is observed every year on 23 November.