# Very simple calculations in flow - how?

**URL:** <https://community.homey.app/t/very-simple-calculations-in-flow-how/69451>\
**Category:** Flows\
**Created:** [September 26, 2022, 12:28pm UTC](https://community.homey.app/t/very-simple-calculations-in-flow-how/69451 "2022-09-26T12:28:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Catoha](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/catoha/32/19000_2.png) [@Catoha](https://community.homey.app/u/Catoha)\
**Post date:** [September 26, 2022, 12:28pm UTC](https://community.homey.app/t/very-simple-calculations-in-flow-how/69451/1 "2022-09-26T12:28:33Z")

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Hi,

I’m searched this for a while, but haven’t found a good guide/explanation.

I’m looking to take a variable and adding a simple calculation such as “variable number - 1” = a new number.

Does anyone know how this can be done in a simple way in a flow?

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**Author:** ![DirkG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirkg/32/118897_2.png) [@DirkG](https://community.homey.app/u/DirkG)\
**Post date:** [September 26, 2022, 12:39pm UTC](https://community.homey.app/t/very-simple-calculations-in-flow-how/69451/2 "2022-09-26T12:39:58Z")

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**Then…**  
– Logik card: Calculate number variable as {{Number variable +1}}

![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/5/4/54ef86a4201d54061bafd79b282e0b13e8d49e00.png)  
(Sorry for my French 😉)

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<div class="post-metadata">

**Author:** ![Catoha](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/catoha/32/19000_2.png) [@Catoha](https://community.homey.app/u/Catoha)\
**Post date:** [September 26, 2022, 12:52pm UTC](https://community.homey.app/t/very-simple-calculations-in-flow-how/69451/3 "2022-09-26T12:52:56Z")

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Thank you very much. That was simple enough 🙂

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [September 26, 2022, 10:24pm UTC](https://community.homey.app/t/very-simple-calculations-in-flow-how/69451/4 "2022-09-26T22:24:50Z")

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You can search the forum for `math.` for more examples (not sure if they’re simple 😉 )