---
title: timeWeightedAvg() function
description: >
  `timeWeightedAvg()` returns the time-weighted average of non-null values in
  `_value` column as a float for each input table.
menu:
  flux_v0_ref:
    name: timeWeightedAvg
    parent: universe
    identifier: universe/timeWeightedAvg
weight: 101
flux/v0/tags: [transformations, aggregates]
introduced: 0.83.0
---

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`timeWeightedAvg()` returns the time-weighted average of non-null values in
`_value` column as a float for each input table.

Time is weighted using the linearly interpolated integral of values in the table.

##### Function type signature

```js
(<-tables: stream[A], unit: duration) => stream[{B with _value: float, _value: float, _stop: D, _start: C}] where A: Record
```

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

## Parameters

### unit
({{< req >}})
Unit of time to use to compute the time-weighted average.



### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Calculate the time-weighted average of values

```js
data
    |> timeWeightedAvg(unit: 1s)

```

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#### Input data

| *_start              | *_stop               | _time                | _value  | *tag |
| -------------------- | -------------------- | -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:50Z | 4       | t1   |

| *_start              | *_stop               | _time                | _value  | *tag |
| -------------------- | -------------------- | -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:00Z |         | t2   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| *_start              | *_stop               | _value            | *tag |
| -------------------- | -------------------- | ----------------- | ---- |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 4.166666666666667 | t1   |

| *_start              | *_stop               | _value            | *tag |
| -------------------- | -------------------- | ----------------- | ---- |
| 2021-01-01T00:00:00Z | 2021-01-01T00:01:00Z | 5.416666666666667 | t2   |

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