kWh to kW Calculator

Convert between Kilowatt-hours (Energy) and Kilowatts (Power), or calculate duration and cost. Accurate energy & power sizer for US homes and generators.

Calculator Form

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I want to calculate: *

Power Output *

Duration *

Cost per kWh (Optional)

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Enter US utility rate (US avg ~$0.16/kWh) or fuel generation cost per kWh.

Calculation Result

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Total Energy Consumption

120.00 kWh

Equivalent Power / Energy 120,000 Wh

Estimated Cost $19.20

Formula: 5.00 kW × 24.00 h = 120.00 kWh

Understanding Power vs. Energy

It is easy to confuse Kilowatts (kW) and Kilowatt-hours (kWh), but they measure fundamentally different electrical properties. Think of it like a vehicle trip:

kW (Power): This is like speed (mph). It represents the rate at which electricity is being generated or consumed at any exact moment.
kWh (Energy): This is like distance (miles). It represents the total volume of electricity consumed or produced over a duration of time.

Key Electrical Formulas:

Energy (kWh) = Power (kW) × Time (hours)
Power (kW) = Energy (kWh) / Time (hours)
Time (hours) = Energy (kWh) / Power (kW)

Common Generator Energy Production Chart

Generator Size	Load %	Output (kW)	Daily Energy (24h)
2,000 W	50%	1.0 kW	24 kWh
5,000 W	50%	2.5 kW	60 kWh
10,000 W	75%	7.5 kW	180 kWh
20,000 W	50%	10.0 kW	240 kWh
50,000 W	80%	40.0 kW	960 kWh

*Assuming continuous constant load over 24 hours.

How to Convert Between kWh and kW

With the basic formulas at hand, converting between power and energy is a straightforward calculation. Ensure your units are aligned (hours for duration, continuous kW for power).

Find Energy (kWh)

Multiply continuous power by running hours.

Energy = Power × Time

Example: 2 kW × 5 h = 10 kWh

Find Power (kW)

Divide energy used by elapsed hours.

Power = Energy ÷ Time

Example: 20 kWh ÷ 4 h = 5 kW

Find Time (Hours)

Divide battery or total kWh by generator kW.

Time = Energy ÷ Power

Example: 5 kWh ÷ 1 kW = 5 hours

Frequently Asked Questions

What happens if I run a 5 kW generator for 12 hours?

If the generator runs at full load (5 kW) for 12 hours: Power (5 kW) × Time (12 hours) = 60 kWh of electrical energy produced.

Why are US solar batteries rated in Wh or kWh?

Batteries store total energy. A 1 kWh (1,000 Wh) battery power station can deliver 1,000 W for 1 hour, or 500 W for 2 hours before depletion.

Does a 2,000-watt inverter draw 2 kWh per hour?

Only if it is operating at its maximum 2,000 W capacity continuously for 1 full hour. At lighter loads, it draws significantly less kWh.

What is the average US residential cost per kWh?

In the United States, electricity averages around $0.16 per kWh. Generating 50 kWh on a generator corresponds to ~$8.00 in grid electrical energy equivalent.

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