# Arithmetic Operations in logstash

**URL:** <https://discuss.elastic.co/t/arithmetic-operations-in-logstash/177183>\
**Category:** Logstash\
**Created:** [April 17, 2019, 4:40am UTC](https://discuss.elastic.co/t/arithmetic-operations-in-logstash/177183 "2019-04-17T04:40:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dinesh1](https://avatars.discourse-cdn.com/v4/letter/d/7bcc69/32.png) [@dinesh1](https://discuss.elastic.co/u/dinesh1)\
**Post date:** [April 17, 2019, 4:40am UTC](https://discuss.elastic.co/t/arithmetic-operations-in-logstash/177183/1 "2019-04-17T04:40:53Z")

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Hi Team,

How to perform arithmetic Operations in logstash  
Example: (((field1)+((($field2)-(field1))/2))/300)

Thanks,  
Dinesh

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<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [April 17, 2019, 12:57pm UTC](https://discuss.elastic.co/t/arithmetic-operations-in-logstash/177183/2 "2019-04-17T12:57:39Z")

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There is a [math](https://github.com/logstash-plugins/logstash-filter-math) filter that you could install. Otherwise you have to use a ruby filter.

```
ruby { code => 'event.set("someField", event.get("field1") + event.get("field2"))' }
```

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 15, 2019, 1:02pm UTC](https://discuss.elastic.co/t/arithmetic-operations-in-logstash/177183/3 "2019-05-15T13:02:11Z")

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