British Thermal Units to Kilowatt Hours
Convert British thermal units to kilowatt hours instantly — one British thermal unit is 0.000293071 kilowatt hours.
| British Thermal Units | Kilowatt Hours |
|---|---|
| 1 BTU | 0.000293 kWh |
| 2 BTU | 0.000586 kWh |
| 3 BTU | 0.000879 kWh |
| 5 BTU | 0.001465 kWh |
| 10 BTU | 0.002931 kWh |
| 25 BTU | 0.007327 kWh |
| 50 BTU | 0.014654 kWh |
| 100 BTU | 0.029307 kWh |
How to use
- Enter a value in the British Thermal Units field.
- The Kilowatt Hours figure appears immediately — no button to press.
- Typing in the Kilowatt Hours field converts back to British Thermal Units the same way.
- Use the reference table for the values that come up most often.
British Thermal Units to Kilowatt Hours formula
To convert British thermal units to kilowatt hours, multiply by 0.00029307107.
kWh = BTU × 0.00029307107
Why this factor: the British thermal unit and the kilowatt-hour are both defined against the joule, so dividing one definition by the other gives 0.00029307107 directly. Both definitions are set out in full below.
To go the other way, divide by 0.00029307107 — or use the Kilowatt Hours to British Thermal Units converter, which is the same calculation reversed.
Worked example
Start with 500 BTU. Multiply by 0.00029307107 to get 0.146536 kWh.
500 BTU × 0.00029307107 = 0.146536 kWh
The converter above does this for any value you type, in either direction.
What is a British thermal unit?
A BTU is the energy needed to raise one pound of water by one degree Fahrenheit.
Definition: The international-table BTU is about 1,055.056 joules.
Where it is used: US heating and air-conditioning capacity ratings, natural gas pricing, and boiler output.
Worth knowing: Air-conditioner ratings quoted as 'BTU' are really BTU per hour — a rate of cooling, not a quantity of energy.
What is a kilowatt-hour?
A kilowatt-hour is the standard billing unit for electricity — one kilowatt drawn for one hour.
Definition: Exactly 3.6 megajoules.
Where it is used: Electricity bills worldwide, solar generation figures, and electric vehicle battery capacity.
British Thermal Units vs Kilowatt Hours
The British thermal unit is a US customary unit while the kilowatt-hour is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilowatt hours are in a British thermal unit?
One British thermal unit equals 0.00029307107 kilowatt hours.
What is the formula to convert British thermal units to kilowatt hours?
Multiply the number of British thermal units by 0.00029307107. To reverse it, divide by 0.00029307107 instead.
How do I convert kilowatt hours back to British thermal units?
Divide by 0.00029307107, which is the same as multiplying by 3412.14163.
How many kilowatt hours are in 10 British thermal units?
10 BTU works out to 0.002931 kWh.
Is there anything to watch out for with British thermal units?
Air-conditioner ratings quoted as 'BTU' are really BTU per hour — a rate of cooling, not a quantity of energy.
How is the British thermal unit defined?
The international-table BTU is about 1,055.056 joules.