---
title: math.LOG2E
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/math-constants-limits/math-log2e
---

**Type:** FLOAT  
**Access:** read-only, constant

**Available in:** all subroutines

The value of the logarithm to base 2 of
`math.E` (log_2 e).