Convert Watt-hours (Wh) to Kilowatt-hours (kWh)
1 watt-hour equals 0.001 kilowatt-hours.
Watt-hour to Kilowatt-hour Converter
What Is a Watt-hour?
The watt-hour (Wh) is a unit of energy equal to the energy consumed by a 1-watt device running for 1 hour (3,600 joules). Small batteries and individual appliance consumption are typically expressed in Wh.
What Is a Kilowatt-hour?
The kilowatt-hour (kWh) is a unit of energy equal to 1,000 watt-hours. It is the standard billing unit for electricity — your utility meter tracks kWh, and rates are quoted as cost per kWh.
Watt-hours to Kilowatt-hours Formula
The conversion is exact by definition:
kilowatt-hours = watt-hours ÷ 1,000
The "kilo-" prefix means one thousand. Move the decimal 3 places left.
Worked Example
Convert 2,500 Wh (a portable power station's capacity) to kWh:
- Divide: 2,500 ÷ 1,000 = 2.5 kWh
Common Watt-hours to Kilowatt-hours Conversions
| Watt-hours | kWh | Context |
|---|---|---|
| 10 Wh | 0.01 kWh | 10W LED bulb for 1 hour |
| 50 Wh | 0.05 kWh | Laptop battery (ultrabook) |
| 100 Wh | 0.1 kWh | TSA battery limit for flights |
| 250 Wh | 0.25 kWh | Microwave: 1,000W × 15 min |
| 500 Wh | 0.5 kWh | E-bike battery / hair dryer 30 min |
| 1,000 Wh | 1 kWh | 1 kW heater for 1 hour ($0.16) |
| 1,500 Wh | 1.5 kWh | US space heater for 1 hour |
| 5,000 Wh | 5 kWh | One load of laundry (wash + dry) |
| 10,000 Wh | 10 kWh | AC unit running 3 hours |
| 28,000 Wh | 28 kWh | Central AC: 3,500W × 8 hours |
| 50,000 Wh | 50 kWh | Tesla Powerwall 2 (usable capacity) |
Common Appliance Energy Consumption
To calculate cost, convert Wh to kWh, then multiply by your electricity rate:
- LED bulb (10W × 10h): 100 Wh = 0.1 kWh → $0.016/day
- Laptop (50W × 8h): 400 Wh = 0.4 kWh → $0.064/day
- Microwave (1,000W × 15 min): 250 Wh = 0.25 kWh → $0.04 per use
- AC (3,500W × 8h): 28,000 Wh = 28 kWh → $4.48/day
When You Need This Conversion
- Electricity costs: Appliances list wattage; bills use kWh. A 100W device for 10 hours = 1,000 Wh = 1 kWh ≈ $0.16 at average US rates.
- Battery specs: Power banks list mAh or Wh; comparing to home batteries in kWh requires conversion. A 500 Wh power station = 0.5 kWh.
- Solar planning: Panel daily output in Wh vs monthly in kWh. 2,000 Wh/day × 30 days = 60,000 Wh = 60 kWh/month.
Frequently Asked Questions
How many Wh in a kWh?
Exactly 1,000 Wh. The "kilo-" prefix means one thousand.
How do I calculate appliance cost per hour?
Multiply the wattage by hours used, divide by 1,000 to get kWh, then multiply by your rate. Example: 1,500W × 1h = 1,500 Wh = 1.5 kWh × $0.16 = $0.24/hour.
What is the difference between Wh and Ah for batteries?
Wh = Ah × voltage. A 5,000 mAh phone battery at 3.7V = 5 × 3.7 = 18.5 Wh. Wh is more useful for comparing batteries of different voltages.
How do I convert kWh to Wh?
Multiply by 1,000. Example: 2.5 kWh = 2,500 Wh. Move the decimal 3 places right.
Common Watt-hour to Kilowatt-hour Conversions
| Watt-hour | Kilowatt-hour | Actions |
|---|---|---|
| 100 watt-hours | 0.1 kilowatt-hours | |
| 250 watt-hours | 14 kilowatt-hours | |
| 500 watt-hours | 12 kilowatt-hours | |
| 1000 watt-hours | 1 kilowatt-hour |
| Watt-hour | Kilowatt-hour | Actions |
|---|---|---|
| 2000 watt-hours | 2 kilowatt-hours | |
| 5000 watt-hours | 5 kilowatt-hours | |
| 10000 watt-hours | 10 kilowatt-hours |
Watt-hours to kilowatt-hours Conversion Table
Reference table with common watt-hours to kilowatt-hours conversions. All values calculated with high precision.
Watt-hours to Kilowatt-hours Table
1000 to 1 × 108
Kilowatt-hours to Watt-hours Table
1 to 100000
Looking for the reverse? Convert Kilowatt-hour to Watt-hour
Related in other categories:
- Watts to Kilowatts — kW measures power; kWh measures energy (power × time)
