A kilowatt-hour is 3.6 million joules.
kWhs to BTU Converter — kWh to BTU
Convert kWh (kWh) to BTU (BTU) using the exact conversion factor (1 kwh = 3,412.141633 btu). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
kWhs to BTU converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
British thermal unit.
Result = input x 3.6e+6 / 1055.055853.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting kWhs to BTU
kWh and BTU both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. kWh is typically associated with used worldwide for electricity billing, while BTU is typically associated with united States (HVAC, heating, and appliance energy ratings).
Formula
btu = kwhs × 3412.14163313
This factor comes from each unit's defined relationship to the category's base unit: 1 kwh equals 3600000 base units, and 1 btu equals 1055.05585262 base units, so dividing one by the other gives the direct kwh-to-btu factor of 3412.14163313.
Simple example
1 kWh × 3412.141633 = 3,412.141633 BTU
1 kwh = 3,412.141633 btu.
Real-world example
100 kWh × 3412.141633 = 341,214.1633 BTU
100 kwhs = 341,214.1633 btu.
Conversion table
| kWh (kWh) | BTU (BTU) |
|---|---|
| 1 kWh | 3,412.141633 BTU |
| 10 kWh | 34,121.41633 BTU |
| 50 kWh | 170,607.0817 BTU |
| 100 kWh | 341,214.1633 BTU |
| 500 kWh | 1,706,070.817 BTU |
| 1,000 kWh | 3,412,141.633 BTU |
Reverse conversion: BTU to kWh
1 BTU × 0.0002930710702 = 0.0002930711 kWh
1 btu = 0.0002930711 kwhs.
kwhs = btu × 0.000293071070172
For a page dedicated to this direction, see BTU to kWh.
kWh vs. BTU
| Aspect | kWh | BTU |
|---|---|---|
| Family | Non-SI unit accepted for use with SI | US customary unit |
| Typical use | Residential and commercial electricity billing worldwide | Air conditioner and furnace capacity ratings in the US |
| Where it's used | Used worldwide for electricity billing | United States (HVAC, heating, and appliance energy ratings) |
Understanding the kWh
kWh (kWh) measures energy. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. It is classified as a Non-SI unit accepted for use with SI.
Where it's used: Used worldwide for electricity billing
Uses of the kWh today
- Residential and commercial electricity billing worldwide
- Battery capacity ratings (especially electric vehicles)
- Energy policy and grid-scale power statistics
History of the kWh
The kilowatt-hour became the standard electricity billing unit as power utilities expanded in the late 19th and early 20th centuries, since it conveniently matches the scale of typical household electricity consumption, unlike the much smaller joule.
Historical origin. kWh was not the invention of a single named person; it developed through the process described above.
Understanding the BTU
BTU (BTU) measures energy. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). It is classified as a US customary unit.
Where it's used: United States (HVAC, heating, and appliance energy ratings)
Uses of the BTU today
- Air conditioner and furnace capacity ratings in the US
- Water heater and appliance energy specifications
- US energy industry (natural gas is often billed via BTU content)
History of the BTU
The BTU originated in 19th-century steam engineering as the heat needed to raise one pound of water by one degree Fahrenheit, paralleling the calorie's metric definition. Several slightly different BTU values existed historically before the 'International Table' BTU was standardized at exactly 1,055.05585262 joules.
Historical origin. BTU was not the invention of a single named person; it developed through the process described above.
kWh — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the kilowatt-hour among accepted non-SI energy units.
BTU — sources
- NIST Special Publication 811 — Documents the International Table BTU's exact joule equivalence.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many btu are in 1 kwh?
1 kwh equals 3,412.141633 btu, using the exact defined conversion factor rather than an estimate.
How do I convert kwh to btu?
Multiply the kwh value by 3412.141633. The converter above does this instantly to whatever precision you set.
How do I convert btu back to kwh?
Use the reverse factor: 1 btu equals 0.0002930711 kwhs. You can also use the swap control in the converter above to flip the direction instantly.
What is a kwh?
kWh (kWh) measures energy. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. It is classified as a Non-SI unit accepted for use with SI.
What is a btu?
BTU (BTU) measures energy. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). It is classified as a US customary unit.
Is the kwh to btu conversion exact?
Yes. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the kwh still used today?
Used worldwide for electricity billing
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.