# Calculate power usage of device with smart plug **URL:** \ **Category:** Questions & Help\ **Created:** [April 15, 2024, 9:52am UTC](https://community.homey.app/t/calculate-power-usage-of-device-with-smart-plug/108247 "2024-04-15T09:52:28Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Mark\_Blom](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/mark_blom/32/15859_2.png) [@Mark\_Blom](https://community.homey.app/u/Mark_Blom)\ **Post date:** [April 15, 2024, 9:52am UTC](https://community.homey.app/t/calculate-power-usage-of-device-with-smart-plug/108247/1 "2024-04-15T09:52:28Z")
Hi, Can anyone give me some tips how to achieve the following? I have a Fibaro smart plug and my washing machine is connected to that plug. I have some flows that measure the power usage of the plug so when I it exceeds 1W I assume the machine is on and when it is more than 5 minutes lower than 5W I assume it is done. Now, I would like to know the power usage during this ON - OFF period so I can get an idea of the cost per cycle. What are the steps that I should take from the current flows that I have to achieve this goal? Regards, Mark ---
**Author:** ![Rmb](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rmb/32/79135_2.png) [@Rmb](https://community.homey.app/u/Rmb)\ **Post date:** [April 15, 2024, 10:10am UTC](https://community.homey.app/t/calculate-power-usage-of-device-with-smart-plug/108247/2 "2024-04-15T10:10:08Z")
Use the app Power By The Hour. ---
**Author:** ![Mark\_Blom](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/mark_blom/32/15859_2.png) [@Mark\_Blom](https://community.homey.app/u/Mark_Blom)\ **Post date:** [April 15, 2024, 11:14am UTC](https://community.homey.app/t/calculate-power-usage-of-device-with-smart-plug/108247/3 "2024-04-15T11:14:52Z")
Thanks, will have a look at that app!