Look for price per kWh
Your bill may call this the energy charge, usage charge, unit rate, consumption charge, or supply rate. The important part is a monetary amount per kilowatt-hour. Convert cents or pence into the main currency unit before entering it: 18 cents becomes 0.18.
Separate variable and fixed charges
Daily service charges, meter fees, minimum charges, taxes, and other fixed amounts may affect the bill but do not necessarily change when one appliance consumes another kWh. PowerCost Lab initially models the marginal energy charge.
Tiered and time-of-use tariffs
If your rate changes by consumption tier or time of day, run separate scenarios using the rate that applies when the appliance operates. PowerCost Lab now stores source-backed tariff revisions and validity windows, but only verified, current flat references can prefill a calculator; explicit scenarios remain more honest for slabs and time-of-use plans.
Run your own scenario