What Is a Kilowatt Hour (kWh)?
A kilowatt hour is the single most important unit on your electricity bill — and one of the most misunderstood. Here's what it actually means, with real-world examples.
⚡ Key takeaways
- ✓kWh = how much electricity you use over time. kW = how fast you're using it right now.
- ✓A 1,000W appliance running for 1 hour uses exactly 1 kWh.
- ✓The US average electricity rate is ~$0.16 per kWh (2024).
- ✓The average US home uses ~886 kWh per month.
The simplest possible explanation
Electricity is measured in two ways:
kW
Kilowatt — Power
How fast electricity is flowing right now. Like speed (mph).
Example: a kettle uses 2 kW
kWh
Kilowatt Hour — Energy
Total electricity used over time. Like distance (miles).
Example: the kettle uses 0.1 kWh per boil
Your electricity bill charges you for kWh used — not for how many appliances you own or how powerful they are, but for how much energy they actually consumed.
Formula:
kWh = (Watts ÷ 1,000) × Hours
Everyday examples
Here's how long common appliances take to use 1 kWh — and what that costs at the US average rate of $0.16/kWh:
| Appliance | Wattage | Hours to use 1 kWh | Cost/hour |
|---|---|---|---|
| Electric oven | 2,400W | 0.4 hrs | $0.38 |
| Tumble dryer | 5,000W | 0.2 hrs | $0.80 |
| Electric kettle | 2,000W | 0.5 hrs | $0.32 |
| Vacuum cleaner | 1,400W | 0.7 hrs | $0.22 |
| Desktop computer | 200W | 5 hrs | $0.03 |
| LED TV (50") | 100W | 10 hrs | $0.02 |
| Refrigerator | 150W | 6.7 hrs | $0.02 |
| LED light bulb | 10W | 100 hrs | $0.002 |
| Phone charger | 5W | 200 hrs | $0.001 |
Based on US average $0.16/kWh. Wattages are typical values — check your appliance label for exact figures.
🧮 Calculate the cost of any appliance
Enter any wattage and hours to see exact electricity costs at your local rate.
Open kWh Cost Calculator →How kWh appears on your electricity bill
Your bill will show something like:
The energy charge (per kWh) is the part you can directly control by using less electricity. The fixed customer charge stays the same regardless of how much you use.
How much does the average home use?
🇺🇸 United States
886 kWh/month
$142/month
Source: EIA 2023
🇬🇧 United Kingdom
285 kWh/month
~£68/month
Source: Ofgem 2024
🇨🇦 Canada
1,000 kWh/month
~CAD $130/mo
Source: Nat. Resources CA
🇦🇺 Australia
580 kWh/month
~AUD $174/mo
Source: AER 2024
These are national averages. Actual use varies enormously by home size, number of occupants, climate zone, whether you have electric heating or an EV, and lifestyle habits.
The biggest kWh users in a typical home
Central HVAC is by far the biggest consumer in most homes
Electric water heaters use 4,000–5,500W and run several hours daily
The dryer alone uses 4–6 kWh per load
LEDs have cut this dramatically — was 15%+ with incandescent
Runs 24/7, so even low wattage adds up to ~450 kWh/year
Adding an EV can increase home usage by 25–50%
🧾 See your bill broken down
Enter your monthly kWh usage and rate to calculate your exact electricity bill, including fixed charges and taxes.
Open Bill Calculator →Frequently asked questions
What is a kilowatt hour in simple terms?
A kilowatt hour (kWh) is the amount of energy used when a 1,000-watt appliance runs for one hour. For example: a 1,000W microwave running for 1 hour uses 1 kWh. A 100W light bulb running for 10 hours uses 1 kWh. Your electricity bill charges you per kWh used.
How many kWh does the average home use per month?
The average US household uses about 886 kWh per month (EIA, 2023). UK households average around 240–330 kWh/month. Canadian homes average 900–1,100 kWh/month. Australian homes average 500–650 kWh/month. Usage varies significantly by home size, climate, heating type, and number of occupants.
How much does 1 kWh cost?
In the US, the national average is about $0.16 per kWh (EIA, 2024). Hawaii is highest at $0.40+/kWh; Louisiana is lowest at $0.09/kWh. In the UK the unit rate is approximately £0.24/kWh. Canada averages CAD $0.13/kWh. Australia averages AUD $0.30/kWh. Your exact rate is on your electricity bill.
Is kWh the same as kW?
No. kW (kilowatts) measures power — how fast energy is being used right now. kWh (kilowatt hours) measures energy — the total amount used over time. Think of kW as speed (mph) and kWh as distance (miles). A 2 kW heater running for 3 hours uses 6 kWh of energy.
How do I calculate kWh from watts?
Formula: kWh = (Watts ÷ 1,000) × Hours. Example: a 2,000W electric oven running for 2 hours = (2,000 ÷ 1,000) × 2 = 4 kWh. Multiply by your electricity rate to get the cost: 4 kWh × $0.16 = $0.64.