BTU to Kilowatt Hours Converter
Convert BTU to kilowatt hours instantly with our free online tool. Perfect for AC sizing, furnace comparisons, and energy bills. Get accurate BTU to kWh results.
Energy ConverterThe quick answer for 1 BTU — type any value below for the exact result
BTU
Kilowatt Hours
BTU to kWh Conversion Formula
To convert BTU to kilowatt hours, multiply the BTU value by 2.93072e-4 (0.000293072). One BTU equals 1055.06 joules and one kilowatt hour equals 3,600,000 joules, so the ratio works out to about 0.000293072 — or 3412.13 BTU per kWh in reverse.
BTU and Kilowatt Hours Explained
BTU (btu)
The British Thermal Unit (BTU) is the imperial heat unit: the energy to raise one pound of water by 1°F, equal to 1055.06 joules. American HVAC equipment lives in BTU per hour — window air conditioners span 5,000 to 12,000 BTU/h, residential furnaces 40,000 to 120,000 BTU/h, and gas bills arrive as therms of 100,000 BTU each. One BTU is roughly the heat of a burning wooden match.
Where it is used: Standard across the United States heating, cooling, grill, and fuel industries; also appears in Energy Star documentation and international LNG trading.
Origin: Descends from 19th-century British steam engineering; the International Table definition fixing it at 1055.06 J was standardized in the 1950s as imperial and metric systems needed a firm bridge.
Kilowatt Hours (kwh)
The kilowatt hour (kWh) is the billing unit of electricity: one kilowatt sustained for one hour, equal to 3,600,000 joules or 3412.13 BTU. Households consume it daily — a US home averages about 30 kWh per day — and every electric meter counts it. For heating comparisons, the kWh is the common denominator that lets electric heat pumps, resistance heaters, and gas furnaces (converted from BTU) compete on one price sheet.
Where it is used: Universal in electricity billing, EV and battery specifications, appliance energy labels, and any cost comparison involving electric equipment.
Origin: Created by electric utilities in the 1880s as a natural billing unit of power multiplied by time; accepted for trade worldwide despite the SI system preferring joules.
BTU to Kilowatt Hours Conversion Table
| BTU (btu) | Kilowatt Hours (kwh) |
|---|---|
| 1 btu | 0.0002930722 kwh |
| 10 btu | 0.0029307222 kwh |
| 100 btu | 0.0293072222 kwh |
| 500 btu | 0.1465361111 kwh |
| 1000 btu | 0.2930722222 kwh |
| 5000 btu | 1.4653611111 kwh |
| 9000 btu | 2.63765 kwh |
| 12000 btu | 3.5168666667 kwh |
| 18000 btu | 5.2753 kwh |
| 24000 btu | 7.0337333333 kwh |
| 36000 btu | 10.5506 kwh |
| 60000 btu | 17.5843333333 kwh |
| 91500 btu | 26.8161083333 kwh |
| 100000 btu | 29.3072222222 kwh |
Kilowatt Hours to BTU Conversion Table
| Kilowatt Hours (kwh) | BTU (btu) |
|---|---|
| 0.001 kwh | 3.4121282202 btu |
| 0.01 kwh | 34.121282202 btu |
| 0.1 kwh | 341.2128220196 btu |
| 0.25 kwh | 853.032055049 btu |
| 0.5 kwh | 1706.064110098 btu |
| 1 kwh | 3412.128220196 btu |
| 2 kwh | 6824.256440392 btu |
| 3.5 kwh | 11942.448770686 btu |
| 5 kwh | 17060.64110098 btu |
| 10 kwh | 34121.2822019601 btu |
| 30 kwh | 102363.8466058802 btu |
| 100 kwh | 341212.8220196008 btu |
BTU to Kilowatt Hours in Everyday Objects
Common real-world examples that make BTU and Kilowatt Hours easy to picture at a glance.
| BTU (btu) | Kilowatt Hours (kwh) | |
|---|---|---|
| A wooden match burning | 1 btu | 0.0002930722 kwh |
| A window AC, one hour | 12000 btu | 3.5168666667 kwh |
| A 3-ton central AC, one hour | 36000 btu | 10.5506 kwh |
| A gas furnace, one hour | 60000 btu | 17.5843333333 kwh |
| A therm of natural gas | 100000 btu | 29.3072222222 kwh |
| A gallon of propane | 91500 btu | 26.8161083333 kwh |
When You Need BTU to Kilowatt Hours Conversions
Window Air Conditioner Running Costs
A bedroom unit rated 8,000 BTU/h moves 2.34458 kWh of heat per hour. Multiplying by local electric rates turns the yellow Energy Guide tag into a real monthly bill estimate before purchase.
Gas Furnace Versus Heat Pump Decision
Convert the furnace output first: an 80,000 BTU/h model delivers 23.4458 kWh of heat hourly. Comparing gas cost per therm against electricity per kWh reveals which system heats cheaper in your market.
Energy Star Document Review
Efficiency filings state capacities in BTU/h and consumption in kWh. Converting a pool heater's 150,000 BTU/h rating to 43.9608 kWh of heat keeps compliance spreadsheets internally consistent.
Generator and Backup Power Planning
Standby generators are sized in kW while furnace blowers and AC loads appear in BTU/h. Converting a 48,000 BTU/h AC (14.0675 kWh per hour) into kW draw confirms whether a 20 kW generator carries the summer peak.
Related Energy Conversions
How to Use
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1
Enter BTU
Type the BTU value from an appliance rating or heating table — common entries include 12,000 for a window air conditioner and 40,000 for a gas furnace burner
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2
View Kilowatt Hours
The electricity-scale equivalent appears instantly: 36,000 BTU (a 3-ton AC hour) converts to 10.5506 kWh, ready to price at your utility rate
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3
Copy or Swap
Copy the result or click Swap to convert kilowatt hours back to BTU for reverse checks on equipment specs
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4
Estimate the Running Cost
Multiply the kWh by your rate: at $0.15 per kWh, that 36,000 BTU hour of cooling costs about $1.58 in electricity (before the 3-4× efficiency bonus of a real heat pump)
Why Use Be Converter?
Instant Conversion
Get precise BTU to kWh results in real-time as you type — ideal for sizing air conditioners and comparing heating fuels
Exact Definition-Based Factor
Chains the exact definitions 1 BTU = 1055.06 J and 1 kWh = 3.6 MJ, so 341,213 BTU always lands on almost exactly 100 kWh
Conversion Table
Quick reference across HVAC scales — a 12,000 BTU window unit hour (3.51687 kWh), a 60,000 BTU furnace hour (17.5843 kWh), and a 100,000 BTU therm (29.3072 kWh)
Bidirectional
Easily swap between BTU and kilowatt hours with one click to price gas equipment against electric alternatives
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Frequently Asked Questions
How many kWh are in 1 BTU?
How many kWh is a 12,000 BTU air conditioner?
How do I convert 100,000 BTU to kWh?
How many BTU is 1 kilowatt hour?
Why do heat pumps list both BTU and kWh?
How many kWh is a gas furnace hour?
Is a BTU cheaper than a kWh?
How do I size an air conditioner using kWh?
About BTU to Kilowatt Hours Converter
Our free online BTU to kilowatt hours converter provides instant, accurate energy conversions for HVAC sizing, heating comparisons, and utility analysis. American air conditioners, furnaces, and water heaters are rated in BTU per hour, while electricity is bought in kilowatt hours — and every fuel-versus-electricity decision eventually requires bridging the two. Using the exact chain 1 BTU = 1055.06 J and 1 kWh = 3,600,000 J, this tool converts BTU to kWh (factor 2.93072e-4) or back (1 kWh = 3412.13 BTU) so you can price a furnace hour against a heat pump, check an Energy Star claim, or translate a gas bill in therms into electricity terms.
Expert Tips for BTU to kWh Conversion
Memorize one number: 1 kWh = 3412.13 BTU. Everything else follows — 10 kWh = 34,121.3 BTU and 1 million BTU = 293.072 kWh.
Sizing shortcuts: 12,000 BTU/h = 3.51687 kWh of hourly cooling (one ton), 24,000 BTU/h = 7.03373 kWh (two tons), 36,000 BTU/h = 10.5506 kWh (three tons).
Gas bill translation: each therm (100,000 BTU) equals 29.3072 kWh of heat. If gas costs less per therm than 29.3 times your electric rate per kWh, gas heating wins on raw energy price.
Heat pump shopping: convert the rated heating output in BTU/h to kWh (× 2.93072e-4), then divide by the rated electrical input in kW to get the COP. A 36,000 BTU/h unit drawing 3 kW delivers 10.5506 ÷ 3 ≈ COP 3.5.
Annual energy audits: US home heating near 80 million BTU per year equals about 23,445.8 kWh of heat. Comparing that with your actual electric or gas billing reveals system efficiency losses immediately.