# Calculate BMI

**URL:** <https://community.homey.app/t/calculate-bmi/29808>\
**Category:** Questions & Help\
**Created:** [May 13, 2020, 7:14pm UTC](https://community.homey.app/t/calculate-bmi/29808 "2020-05-13T19:14:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Danny\_Mertens](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/danny_mertens/32/4247_2.png) [@Danny\_Mertens](https://community.homey.app/u/Danny_Mertens)\
**Post date:** [May 13, 2020, 7:14pm UTC](https://community.homey.app/t/calculate-bmi/29808/1 "2020-05-13T19:14:27Z")

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Hi,

I use Withings to get my weight and length in Homey and now would like to create a variable with the BMI, can somebody give me an example how I can use calculations to do this?

Variable in Homey:

Gewicht\_Danny  
Lengte\_Danny

![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/3/6/367e728c1214259c3cb330c9c059cb7e595b22a2.png)

so for me

## 1,91 \* 1,91 = 3,65 90 / 3,65

24,66 what means that I have to go on a diet 😉

Thanks!

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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:** [May 14, 2020, 5:50am UTC](https://community.homey.app/t/calculate-bmi/29808/2 "2020-05-14T05:50:44Z")

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You need a third variable, for example “BMI\_Danny”.  
And then you only need to calculate your BMI with this formula:

 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/7/3/73decf03c03de6c4a5ef962250d898701c9c8c2a.jpeg)

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<div class="post-metadata">

**Author:** ![Danny\_Mertens](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/danny_mertens/32/4247_2.png) [@Danny\_Mertens](https://community.homey.app/u/Danny_Mertens)\
**Post date:** [May 14, 2020, 10:08am UTC](https://community.homey.app/t/calculate-bmi/29808/3 "2020-05-14T10:08:59Z")

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Thanks, just what I’m looking for!