---
title: math.FLOAT_MANT_DIG
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/math-constants-limits/math-float-mant-dig
---

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

**Available in:** all subroutines

Number of hexadecimal digits stored for the significand in the
[`FLOAT`](https://www.fastly.com/documentation/reference/vcl/types/float/) type.