---
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: 178
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/math/log10/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.22.0+

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

```
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)}))
```