# Field value Calculation/conversions in Logstash filter plugin

**URL:** <https://discuss.elastic.co/t/field-value-calculation-conversions-in-logstash-filter-plugin/42147>\
**Category:** Logstash\
**Created:** [February 18, 2016, 2:24pm UTC](https://discuss.elastic.co/t/field-value-calculation-conversions-in-logstash-filter-plugin/42147 "2016-02-18T14:24:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Architha](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/architha/32/92477_2.png) [@Architha](https://discuss.elastic.co/u/Architha)\
**Post date:** [February 18, 2016, 2:24pm UTC](https://discuss.elastic.co/t/field-value-calculation-conversions-in-logstash-filter-plugin/42147/1 "2016-02-18T14:24:40Z")

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Hi folks,

Can we do calculations on the field values like "multiplication or division " Or something like converting the value to percentage in the logstash filter Or rounding of numerical values ? If yes, please let me know .  
Thanks !

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**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [February 19, 2016, 6:39am UTC](https://discuss.elastic.co/t/field-value-calculation-conversions-in-logstash-filter-plugin/42147/2 "2016-02-19T06:39:52Z")

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You'll have to write some Ruby code in a [ruby filter](https://www.elastic.co/guide/en/logstash/current/plugins-filters-ruby.html).

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 5:10am UTC](https://discuss.elastic.co/t/field-value-calculation-conversions-in-logstash-filter-plugin/42147/3 "2017-07-06T05:10:43Z")

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