---
title: math.cbrt() function
description: math.cbrt() returns the cube root of x.
url: https://docs.influxdata.com/flux/v0/stdlib/math/cbrt/
estimated_tokens: 1388
product: Flux
version: v0
---

# math.cbrt() function

-   Flux 0.22.0+
-   View InfluxDB support

`math.cbrt()` returns the cube root of x.

##### Function type signature

```js
(x: float) => float
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### x

(Required) Value to operate on.

## Examples

-   [Return the cube root of a value](#return-the-cube-root-of-a-value)
-   [Use math.cbrt in map](#use-mathcbrt-in-map)

### Return the cube root of a value

```js
import "math"

math.cbrt(x: 1728.0)// 12.0

```

### Use math.cbrt in map

```js
import "math"
import "sampledata"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.cbrt(x: r._value)}))
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t1 | -2.18 |
| 2021-01-01T00:00:10Z | t1 | 10.92 |
| 2021-01-01T00:00:20Z | t1 | 7.35 |
| 2021-01-01T00:00:30Z | t1 | 17.53 |
| 2021-01-01T00:00:40Z | t1 | 15.23 |
| 2021-01-01T00:00:50Z | t1 | 4.43 |

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t2 | 19.85 |
| 2021-01-01T00:00:10Z | t2 | 4.97 |
| 2021-01-01T00:00:20Z | t2 | -3.75 |
| 2021-01-01T00:00:30Z | t2 | 19.77 |
| 2021-01-01T00:00:40Z | t2 | 13.86 |
| 2021-01-01T00:00:50Z | t2 | 1.86 |

#### Output data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | -1.296638256974172 | t1 |
| 2021-01-01T00:00:10Z | 2.2185755003939347 | t1 |
| 2021-01-01T00:00:20Z | 1.9442962850073848 | t1 |
| 2021-01-01T00:00:30Z | 2.5977297737212623 | t1 |
| 2021-01-01T00:00:40Z | 2.478753275547562 | t1 |
| 2021-01-01T00:00:50Z | 1.6423582966480554 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 2.7076145363999617 | t2 |
| 2021-01-01T00:00:10Z | 1.7065491319882757 | t2 |
| 2021-01-01T00:00:20Z | -1.5536162529769295 | t2 |
| 2021-01-01T00:00:30Z | 2.703972205402708 | t2 |
| 2021-01-01T00:00:40Z | 2.402081527496116 | t2 |
| 2021-01-01T00:00:50Z | 1.2298089464641 | t2 |