How to convert kilowatt-hours to watt-hours
To convert a measurement in kilowatt-hours to watt-hours, multiply the value by 1,000. The conversion factor comes from the relationship between both units and the joule.
For example, to convert 5 kWh to watt-hours: 5 × 1,000 = 5,000 Wh.
What is a kilowatt-hour?
A kilowatt-hour equals 1,000 watt-hours, or 3.6 million joules, and is the standard unit for billing electrical energy. The kilowatt-hour became the universal unit of electricity metering because it conveniently expresses household consumption. Running a 1,000-watt appliance for one hour uses exactly one kWh.
Common uses of kilowatt-hours include: Household electricity billing; Electric vehicle battery capacity; Home solar and battery systems; Energy audits and efficiency ratings.
What is a watt-hour?
A watt-hour is the energy delivered by one watt of power over one hour, equal to 3,600 joules. The watt-hour emerged with the electrical industry as a practical measure of energy use over time. It underpins the kilowatt-hour that appears on electricity bills worldwide.
Common uses of watt-hours include: Battery capacity ratings; Small electronics energy use; Solar panel and storage sizing; Portable power station specifications.
Kilowatt-hours to watt-hours worked examples
Here are some common values converted:
1 kWh = 1,000 Wh 5 kWh = 5,000 Wh 10 kWh = 10,000 Wh 50 kWh = 50,000 Wh 100 kWh = 100,000 Wh
Frequently asked questions
How many watt-hours are in one kilowatt-hour?
One kilowatt-hour (kWh) equals 1,000 watt-hours (Wh). Multiply any value in kilowatt-hours by 1,000 to convert to watt-hours.
How do I convert kilowatt-hours to watt-hours?
Multiply the value in kilowatt-hours by 1,000. For example, 5 kWh × 1,000 = 5,000 Wh.
How do I convert watt-hours to kilowatt-hours?
Multiply the value in watt-hours by 0.001, or divide by 1,000. Use the swap button on the converter above to reverse the direction.
Is the kilowatt-hour to watt-hour conversion exact?
The thermochemical calorie is defined as exactly 4.184 J and the BTU as 1055.056 J. Conversions between SI energy units are exact.
What is the formula for kilowatt-hours to watt-hours?
The formula is: Wh = kWh × 1,000. This comes from the definition of both units relative to the joule.