---
title: math.is_finite
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/functions/floating-point-classifications/math-is-finite
---

```
BOOL math.is_finite(FLOAT x)
```

**Available in:** all subroutines

Determines whether a floating point value is finite.
See [floating point classifications](https://www.fastly.com/documentation/reference/vcl/functions/floating-point-classifications/)
for more information.