---
title: math.cbrt() function
description: >
  `math.cbrt()` returns the cube root of x.
menu:
  flux_v0_ref:
    name: math.cbrt
    parent: math
    identifier: math/cbrt
weight: 101
---

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



##### Function type signature

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

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

## Parameters

### x
({{< req >}})
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)}))

```

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{{% expand "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   |

{{% /expand %}}
{{< /expand-wrapper >}}