kWh Calculator
Calculate kilowatt hours, energy consumption, and electricity usage. Estimate power consumption and energy costs for appliances and devices.
kWh Calculator
kWh Results
Enter values to calculate kWh
Energy Consumption Information
Common Appliance Power
- • LED Light Bulb: 10W
- • Laptop: 50W
- • TV: 100W
- • Refrigerator: 150W
- • Microwave: 1000W
- • Air Conditioner: 3500W
Energy Cost Examples
- • Average US Rate: $0.12/kWh
- • California: $0.20/kWh
- • Texas: $0.10/kWh
- • New York: $0.18/kWh
- • Florida: $0.11/kWh
About the kWh Calculator
Our free kWh calculator finds energy use (kWh) from power (watts) and time (hours), or estimates cost from kWh and your electricity rate. Use it for appliances and bills. Enter watts and hours for kWh, or kWh and rate for cost. For total bill estimation try our electricity cost calculator.
You may also find our electricity cost calculator useful.
Frequently Asked Questions
How do I calculate kWh from watts?
kWh = (Watts ÷ 1000) × Hours. For example, 100W for 5 hours = 0.5 kWh. This calculator does it for you.
How much does 1 kWh cost?
Rates vary by region and retailer. Enter your rate (e.g. cents per kWh) in the calculator to see cost for your usage.
What uses the most kWh at home?
Heating, cooling, hot water, and large appliances (fridges, dryers) often use the most. Use the calculator to compare.