# Calculating Energy Costs - mathjs with variables

**URL:** <https://community.homey.app/t/calculating-energy-costs-mathjs-with-variables/46881>\
**Category:** Questions & Help\
**Created:** [April 30, 2021, 5:51am UTC](https://community.homey.app/t/calculating-energy-costs-mathjs-with-variables/46881 "2021-04-30T05:51:51Z")\
**Posts on this page:** 1\
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**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\
**Post date:** [April 30, 2021, 10:14am UTC](https://community.homey.app/t/calculating-energy-costs-mathjs-with-variables/46881/2 "2021-04-30T10:14:47Z")

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> [@Getting Started - Logic variables](https://community.homey.app/t/getting-started-logic-variables/20132):
>
> Hi everyone, in this tutorial I will tell you about logic variables and you will learn: how to create a variable the different kind of variables and; their properties and limitations some uses cases of the different types First, let’s take a look at what Athom gave us to work with, shall we? In your app, go to the ‘more’ tab and hit ‘logic’. I already have some variables in my app, so my screen looks like this: You’ll notice I made a blue mark on the printscreen, highligh…

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