FACTDOUBLE Function in Excel: Double Factorial

⏱ 1 min readUpdated 28 September 2026

MathLevel: ExpertAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. Related functions

FACTDOUBLE multiplies every other number: 7!! = 7 × 5 × 3 × 1.

Syntax

=FACTDOUBLE(number)
Argument What it means
number Non-negative.

Examples

Example 1

=FACTDOUBLE(7)

Returns 105 — also the number of ways to pair up 8 people.

FACT

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