kW to kWh Calculator

A kilowatt (kW) measures how much power a device uses, while a kilowatt-hour (kWh) measures how much energy it consumes over time — and that's what appears on your electricity bill. Enter your device's power (in kW) and the time it runs (in hours) into the kW to kWh Calculator to find its energy consumption in kWh. Secondary outputs include estimated daily and monthly electricity costs at a standard rate of $0.15/kWh. Also try the Converted Power — RF Power Conversion.

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Energy Consumption

Daily Cost (@ $0.15/kWh)

Monthly Cost (@ $0.15/kWh)

Results Table

What is the difference between kW and kWh?

kW (kilowatt) is a unit of power that measures how much energy is being used at any given moment. kWh (kilowatt-hour) is a unit of energy that measures the total amount of power consumed over time. Think of kW as the speed of energy usage and kWh as the distance traveled. See also our Amps to kW Calculator.

How do you calculate kWh from kW?

To calculate kWh from kW, multiply the power in kilowatts by the time in hours: Energy (kWh) = Power (kW) × Time (hours). For example, a 2 kW device running for 5 hours consumes 10 kWh of energy.

Can I use minutes instead of hours in the formula?

The standard kWh formula requires time in hours. If you have time in minutes, first convert to hours by dividing by 60. For example, 30 minutes = 0.5 hours. Then use the formula: kWh = kW × hours.

How do I convert watts to kilowatts?

To convert watts to kilowatts, divide the wattage by 1,000. For example, 1,500 watts = 1.5 kilowatts. This is because 1 kilowatt equals 1,000 watts. You might also find our calculate Real Power, Power Efficiency & Reactive Power — VA to Watts useful.

Why is kWh important for electricity bills?

Electricity companies charge customers based on kWh consumption because it represents the total energy used. Your monthly bill shows how many kWh you consumed, multiplied by the rate per kWh to calculate your electricity cost.

What are some common household appliance power ratings?

Common appliances: LED bulb (0.01 kW), microwave (1-1.5 kW), refrigerator (0.1-0.8 kW), air conditioner (1-5 kW), electric heater (1-3 kW), washing machine (0.5-2 kW), and electric oven (2-5 kW).

How can I reduce my kWh consumption?

Reduce kWh by using energy-efficient appliances, turning off devices when not in use, using LED lighting, properly insulating your home, and running high-power appliances during off-peak hours when rates may be lower.