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FACT
FACT computes the factorial of a non-negative integer: FACT(5) = 5 × 4 × 3 × 2 × 1 = 120. Factorials grow extremely fast, so inputs above about 170 exceed Excel's numeric range. The function is foundational for counting permutations and combinations.
Excel
=FACT(A2)Google Sheets
=FACT(A2)✓
Verified example
Computed by a real spreadsheet engine on the sample data below.
| n | n! |
| 0 | |
| 1 | |
| 5 | |
| 7 |
=FACT(A2)→1
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How it works
- 1A2 must be a non-negative integer (e.g. 5).
- 2FACT multiplies every integer from 1 up to A2: FACT(5) = 120.
- 3FACT(0) = 1 by mathematical convention; decimals are truncated before calculation.