Free calculator
Electricity cost calculator
List everything that draws power and how long it runs. Lights dominate, but the 24-hour small loads — fans, pumps, controllers — add up, and the AC pays again for every watt of heat the rest produce.
Devices
Result
3 devices
Cost per month
$50Cost per day
$2
Cost per 60-day cycle
$98
Energy per day
9.6kWh
Uses nameplate wattage — drivers and ballasts often draw 5–10% above the lamp rating, and utilities may bill tiered or time-of-use rates rather than one flat $/kWh. Check a real bill for your marginal rate.
Wondering how much cooling that heat needs? Size the AC in BTU →