Watts to kWh Calculator — Kilowatt-Hours by Run Time
Convert watts to kilowatt-hours — or kWh back to watts — by setting how long the load runs. kWh is the energy unit your utility bills, so this turns an appliance's wattage into the energy it uses. To put a dollar figure on it, jump to the electricity cost calculator. Just converting the power unit (W to kW)? Use the watts to kilowatts converter instead.
Energy used
6 kWh
- Power
- 1,500 W
- Over
- 4 h
- If daily, per month
- 180 kWh
Energy (kWh) = power (W) × hours ÷ 1,000. To turn kWh into a dollar figure at your electricity rate, use the electricity cost calculator linked below.
Frequently asked questions
Ask AI about this
Open an AI assistant with a question grounded in this page.
Related guides
Related tools
Related converters
BTU ↔ kW
Convert BTU/hr to kW, watts, and refrigeration tons (or kW back to BTU) for heat pumps, AC, and furnaces — compare heating and cooling output across units.
Open converterMWh ↔ kWh
Convert megawatt-hours to kilowatt-hours and back — plus watt-hours and gigawatt-hours. 1 MWh = 1,000 kWh. Enter any energy unit to see the rest.
Open converterkWh ↔ MWh
Convert kilowatt-hours to megawatt-hours — MWh = kWh ÷ 1,000 — plus watt-hours and gigawatt-hours. For utility data, solar production, and grid-scale figures.
Open converterBTU ↔ kWh
Convert BTU to kWh and back — plus therms and MMBtu. Energy-unit conversion (1 kWh = 3,412 BTU) for comparing gas and electric energy use.
Open converterSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: