---
title: math.log10() function
description: math.log10() returns the decimal logarithm of x.
url: https://docs.influxdata.com/flux/v0/stdlib/math/log10/
estimated_tokens: 786
product: Flux
version: v0
---

# math.log10() function

-   Flux 0.22.0+
-   View InfluxDB support

`math.log10()` returns the decimal logarithm 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 decimal lagarithm of a value](#return-the-decimal-lagarithm-of-a-value)
-   [Use math.log10 in map](#use-mathlog10-in-map)

### Return the decimal lagarithm of a value

```js
import "math"

math.log10(x: 3.14)// 0.4969296480732149

```

### Use math.log10 in map

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

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.log10(x: r._value)}))
```