---
title: math.2_SQRTPI
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/math-constants-limits/math-2-sqrtpi
---

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

**Available in:** all subroutines

The value of two times the reciprocal of the square root of
`math.PI` (2/sqrt(Pi)).