# How to subtract field value from constant and display in Timelion?

**URL:** <https://discuss.elastic.co/t/how-to-subtract-field-value-from-constant-and-display-in-timelion/113765>\
**Category:** Kibana\
**Tags:** timelion\
**Created:** [January 2, 2018, 11:37am UTC](https://discuss.elastic.co/t/how-to-subtract-field-value-from-constant-and-display-in-timelion/113765 "2018-01-02T11:37:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![elasticheart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/elasticheart/32/65189_2.png) [@elasticheart](https://discuss.elastic.co/u/elasticheart)\
**Post date:** [January 2, 2018, 11:37am UTC](https://discuss.elastic.co/t/how-to-subtract-field-value-from-constant-and-display-in-timelion/113765/1 "2018-01-02T11:37:30Z")

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Hi,

I am using ELK GA 5.0.0. I have a timelion visualization like below;

```
.es(index=myindex-*,q='fielda:data1',metric=max:my_info_a).label("Max")

```

This plots max value of my field `my_info_a`. But what I want is, I want to subtract this number from 100, and then display max of that value. Is this possible?

Thank you.

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<div class="post-metadata">

**Author:** ![Joe\_Fleming](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/joe_fleming/32/3561_2.png) [@Joe\_Fleming](https://discuss.elastic.co/u/Joe_Fleming)\
**Post date:** [January 2, 2018, 6:14pm UTC](https://discuss.elastic.co/t/how-to-subtract-field-value-from-constant-and-display-in-timelion/113765/2 "2018-01-02T18:14:18Z")

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Using `.subtract(100).abs()` is mostly equivalent. It falls apart if you're dealing with values over 100 though.

Timeline works by chaining operations together, so subtracting by a number is pretty simple, but I don't know the expression language well enough to subtract the value from a number.

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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:** [January 30, 2018, 6:14pm UTC](https://discuss.elastic.co/t/how-to-subtract-field-value-from-constant-and-display-in-timelion/113765/3 "2018-01-30T18:14:39Z")

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Closed on January 30, 2018, 6:14pm UTC

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