---
title: math.float64frombits() function
description: math.float64frombits() returns the floating-point number corresponding to the IEE 754 binary representation b, with the sign bit of b and the result in the same bit position.
url: https://docs.influxdata.com/flux/v0/stdlib/math/float64frombits/
estimated_tokens: 1427
product: Flux
version: v0
---

# math.float64frombits() function

-   Flux 0.22.0+
-   View InfluxDB support

`math.float64frombits()` returns the floating-point number corresponding to the IEE 754 binary representation `b`, with the sign bit of `b` and the result in the same bit position.

##### Function type signature

```js
(b: uint) => float
```

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

## Parameters

### b

(Required) Value to operate on.

## Examples

-   [Convert bits into a float value](#convert-bits-into-a-float-value)
-   [Use math.float64frombits in map](#use-mathfloat64frombits-in-map)

### Convert bits into a float value

```js
import "math"

math.float64frombits(b: uint(v: 4))// 2e-323

```

### Use math.float64frombits in map

```js
import "math"

data
    |> map(fn: (r) => ({r with _value: math.float64frombits(b: r._value)}))
```

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

View example input and output

#### Input data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 13835463379248627057 | t1 |
| 2021-01-01T00:00:10Z | 4622337031546119127 | t1 |
| 2021-01-01T00:00:20Z | 4619961382742681190 | t1 |
| 2021-01-01T00:00:30Z | 4625627474023866696 | t1 |
| 2021-01-01T00:00:40Z | 4624763345845364982 | t1 |
| 2021-01-01T00:00:50Z | 4616673755014700728 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 4626280495969835418 | t2 |
| 2021-01-01T00:00:10Z | 4617281740964395745 | t2 |
| 2021-01-01T00:00:20Z | 13838998704956112896 | t2 |
| 2021-01-01T00:00:30Z | 4626257977971698565 | t2 |
| 2021-01-01T00:00:40Z | 4623992104409177784 | t2 |
| 2021-01-01T00:00:50Z | 4611055514479556035 | t2 |

#### Output data

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

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