# Batch function with averaging
**URL:** https://discourse.nodered.org/t/batch-function-with-averaging/72031
**Category:** General
**Tags:** function-node
**Created:** [11 December 2022 12:45 UTC](https://discourse.nodered.org/t/batch-function-with-averaging/72031 "2022-12-11T12:45:11Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@oliver.es](https://discourse.nodered.org/u/oliver.es)
#### Post date: [11 December 2022 12:45 UTC](https://discourse.nodered.org/t/batch-function-with-averaging/72031/1 "2022-12-11T12:45:11Z")
Hi,
in Node-RED there is node called "batch" where I can group messages by time interval. But I need to average every field that is received in meantime repeatedly. The problem is when messages are sent randomly (when values are changed). I can't define in advance the count of messages and even the field names.
It is possible to write that batch function with grouping messages and averaging values"
Thank you
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### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [11 December 2022 13:39 UTC](https://discourse.nodered.org/t/batch-function-with-averaging/72031/2 "2022-12-11T13:39:13Z")
You could use batch and join to get a msg.payload that has all of the values over your set time in an array that you could then calculate an average from (using a change node and JSONata or using a function node). That has the advantage of only needing core nodes.
If you are happy installing another node, the node-red-contrib-calculate node should do what you want I think.
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### Author:  [@oliver.es](https://discourse.nodered.org/u/oliver.es)
#### Post date: [12 December 2022 07:29 UTC](https://discourse.nodered.org/t/batch-function-with-averaging/72031/3 "2022-12-12T07:29:28Z")
node-red-contrib-calculate working perfectly ! thank you
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [26 December 2022 07:29 UTC](https://discourse.nodered.org/t/batch-function-with-averaging/72031/4 "2022-12-26T07:29:41Z")
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