British thermal unit.
BTU to kWhs Converter — BTU to kWh
Convert BTU (BTU) to kWh (kWh) using the exact conversion factor (1 btu = 0.0002930711 kwh). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
BTU to kWhs converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
A kilowatt-hour is 3.6 million joules.
Result = input x 1055.055853 / 3.6e+6.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting BTU to kWhs
BTU and kWh both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). BTU is typically associated with united States (HVAC, heating, and appliance energy ratings), while kWh is typically associated with used worldwide for electricity billing.
Formula
kwhs = btu × 0.000293071070172
This factor comes from each unit's defined relationship to the category's base unit: 1 btu equals 1055.05585262 base units, and 1 kwh equals 3600000 base units, so dividing one by the other gives the direct btu-to-kwh factor of 0.000293071070172.
Simple example
1 BTU × 0.0002930710702 = 0.0002930711 kWh
1 btu = 0.0002930711 kwhs.
Real-world example
100 BTU × 0.0002930710702 = 0.029307107 kWh
100 btu = 0.029307107 kwhs.
Conversion table
| BTU (BTU) | kWh (kWh) |
|---|---|
| 1 BTU | 0.0002930711 kWh |
| 10 BTU | 0.0029307107 kWh |
| 100 BTU | 0.029307107 kWh |
| 500 BTU | 0.1465355351 kWh |
| 1,000 BTU | 0.2930710702 kWh |
| 2,000 BTU | 0.5861421403 kWh |
Reverse conversion: kWh to BTU
0.0002930711 kWh × 3412.141633 = 1.000000102 BTU
0.0002930711 kwhs = 1.000000102 btu.
btu = kwhs × 3412.14163313
For a page dedicated to this direction, see kWh to BTU.
BTU vs. kWh
| Aspect | BTU | kWh |
|---|---|---|
| Family | US customary unit | Non-SI unit accepted for use with SI |
| Typical use | Air conditioner and furnace capacity ratings in the US | Residential and commercial electricity billing worldwide |
| Where it's used | United States (HVAC, heating, and appliance energy ratings) | Used worldwide for electricity billing |
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.
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.
BTU — sources
- NIST Special Publication 811 — Documents the International Table BTU's exact joule equivalence.
kWh — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the kilowatt-hour among accepted non-SI energy units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kwhs are in 1 btu?
1 btu equals 0.0002930711 kwhs, using the exact defined conversion factor rather than an estimate.
How do I convert btu to kwh?
Multiply the btu value by 0.0002930710702. The converter above does this instantly to whatever precision you set.
How do I convert kwh back to btu?
Use the reverse factor: 1 kwh equals 3,412.141633 btu. You can also use the swap control in the converter above to flip the direction instantly.
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.
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.
Is the btu to kwh conversion exact?
Yes. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. 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 btu still used today?
United States (HVAC, heating, and appliance energy ratings)