# Unique count \> Count in kibana

**URL:** <https://discuss.elastic.co/t/unique-count-count-in-kibana/164565>\
**Category:** Elasticsearch\
**Created:** [January 17, 2019, 3:40am UTC](https://discuss.elastic.co/t/unique-count-count-in-kibana/164565 "2019-01-17T03:40:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [January 17, 2019, 6:20am UTC](https://discuss.elastic.co/t/unique-count-count-in-kibana/164565/2 "2019-01-17T06:20:05Z")

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In order to perform well at scale [the cardinality aggregation is an approximation](https://www.elastic.co/guide/en/elasticsearch/reference/6.5/search-aggregations-metrics-cardinality-aggregation.html#_counts_are_approximate), although you can tune this to some extent. The reason behind this is described well in [this post](https://discuss.elastic.co/t/background-count-in-significant-terms-not-consistent/55824/8).

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