Convert Kilowatt-hours (kWh) to Watt-hours (Wh)
1 kilowatt-hour equals 1000 watt-hours.
Kilowatt-hour to Watt-hour Converter
What Is a Kilowatt-hour?
The kilowatt-hour (kWh) is a unit of energy equal to 1,000 watt-hours or 3,600,000 joules. It is the standard billing unit for electricity worldwide. The average US household uses about 30 kWh per day (10,500 kWh per year).
What Is a Watt-hour?
The watt-hour (Wh) is a unit of energy equal to 3,600 joules. It represents the energy consumed by a 1-watt device running for 1 hour. Battery capacities for small devices are typically expressed in Wh or mAh.
Kilowatt-hours to Watt-hours Formula
The conversion is exact by definition:
watt-hours = kilowatt-hours × 1,000
The "kilo-" prefix means exactly one thousand. No rounding needed.
Worked Example
Convert 0.1 kWh (energy used by a 100W bulb for 1 hour) to watt-hours:
- Multiply: 0.1 × 1,000 = 100 Wh
Common Kilowatt-hours to Watt-hours Conversions
| kWh | Wh | Context |
|---|---|---|
| 0.001 kWh | 1 Wh | LED bulb for 6 minutes |
| 0.01 kWh | 10 Wh | Charging a smartphone |
| 0.05 kWh | 50 Wh | Laptop battery (small) |
| 0.1 kWh | 100 Wh | TSA flight battery limit / large laptop |
| 0.5 kWh | 500 Wh | E-bike battery / portable power station |
| 1 kWh | 1,000 Wh | Running a 1 kW heater for 1 hour |
| 2 kWh | 2,000 Wh | One full dryer cycle |
| 10 kWh | 10,000 Wh | Home battery (Powerwall: 13.5 kWh) |
| 40 kWh | 40,000 Wh | Small EV battery (Nissan Leaf) |
| 75 kWh | 75,000 Wh | Mid-range EV battery (Tesla Model 3) |
| 100 kWh | 100,000 Wh | Large EV battery (Tesla Model S) |
Reading Your Electricity Bill
Electricity is billed in kWh. The average US household uses about 900 kWh per month (= 900,000 Wh). At the average US rate of $0.16/kWh, that is about $144/month. To reduce your bill, focus on high-consumption appliances: a 3,500 W clothes dryer running 1 hour uses 3.5 kWh ($0.56). Running it 5 times per week = 910 kWh per year ($146) — just the dryer.
When You Need This Conversion
- Battery comparison: Small batteries are rated in Wh; large batteries in kWh. A laptop with 56 Wh battery = 0.056 kWh. A Tesla Model 3 at 75 kWh = 75,000 Wh.
- Solar energy: Daily production in kWh vs panel-level output in Wh. A 400 W panel producing for 5 peak hours = 2,000 Wh = 2 kWh per day.
- Energy auditing: Converting appliance-level Wh consumption to kWh for cost calculations. 100 W × 10 h = 1,000 Wh = 1 kWh ≈ $0.16.
Frequently Asked Questions
How many Wh in 1 kWh?
Exactly 1,000 Wh. The "kilo-" prefix means one thousand.
What is the difference between kWh and kW?
kW is power (rate of energy use). kWh is energy (total consumption). A 2 kW heater running for 3 hours uses 6 kWh of energy.
How many kWh does a house use per day?
The average US household uses about 30 kWh per day (10,500 kWh/year ÷ 365 days). This varies widely by climate, house size, and efficiency.
How do I convert Wh to kWh?
Divide by 1,000. Example: 5,000 Wh = 5 kWh. Move the decimal 3 places left.
Common Kilowatt-hour to Watt-hour Conversions
| Kilowatt-hour | Watt-hour | Actions |
|---|---|---|
| 0.1 kilowatt-hours | 100 watt-hours | |
| 14 kilowatt-hours | 250 watt-hours | |
| 12 kilowatt-hours | 500 watt-hours | |
| 1 kilowatt-hour | 1000 watt-hours |
| Kilowatt-hour | Watt-hour | Actions |
|---|---|---|
| 2 kilowatt-hours | 2000 watt-hours | |
| 5 kilowatt-hours | 5000 watt-hours | |
| 10 kilowatt-hours | 10000 watt-hours |
Kilowatt-hours to watt-hours Conversion Table
Reference table with common kilowatt-hours to watt-hours conversions. All values calculated with high precision.
Kilowatt-hours to Watt-hours Table
1 to 100000
Watt-hours to Kilowatt-hours Table
1000 to 1 × 108
Looking for the reverse? Convert Watt-hour to Kilowatt-hour
Related in other categories:
- Watts to Kilowatts — kW measures power; kWh measures energy (power × time)
