Constants & Units · constant

Euler's number

e = 2.718 281 828 459 045… —

Unit

—

Value

2.718 281 828 459 045…

Exact

yes

Note

The base of natural growth and decay — and of every exponential on the shelf.

Symbol

e

Category

Mathematical

Numeric

2.718281828459045

Uncertainty

exact (irrational)

Open on the Constants & Units shelf — the interactive card, the filters, and everything alongside it.

From the Constants database in Notion, last edited 2026-08-15. This page is the row, rendered by the build; nothing on it is written by hand.