---
title: math.exp2
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/functions/math-logexp/math-exp2
---

```
FLOAT math.exp2(FLOAT x)
```

**Available in:** all subroutines

Computes the value of 2 raised to the `x` power (e.g., 2ˣ).

This is equivalent to shifting the integer 1 to `x` bits to the left
(e.g., `2^x == 1 << x`), except that `math.exp2` is only for `FLOAT` type values.

## Example

```vcl
sub vcl_deliver {
  declare local var.foo FLOAT;
  set var.foo = math.exp2(32); # result: 4294967296.0
}
```