I dont think there is any calculator that accurately counts electricity for Chia.
For GPU this is easy because the energy consumption is known. But with different setups for chia, it wont be very accurate.
I just calculate it myself. Have a kwh on the system so i know the cost.
I didnt calculate a minimum value, i’m hodling anyway, so no point calculating current price.
Im getting about 0,05 XCH per day or 1,6 per month. Electricity is expensive here.
0,24kW x 24h x 0,28$ x 30days ~ 50$ per month.
So XCH would have to drop below 30$ for electricity to be more than earnings.
You are right that your hardware also has wear, and depreciation. Although wear is mostly limited to hdd’s.
Depreciation wise you might just count total system cost over 10 years.
In my case 8K, lets say after 10 years only worth 1K, so 7K depreciated.
Over 10 years thats about $60 per month.
So that would mean total montly cost is about $110 for me. Add a few failed hhd’s along the way, lets call it $130 per month.