Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 BTU | 1.00024e-08 therm | |
| 0.01 BTU | 1.00024e-07 therm | |
| 0.1 BTU | 1.00024e-06 therm | |
| 1 BTU | 1.00024e-05 therm | |
| 5 BTU | 5.00121e-05 therm | |
| 10 BTU | 0.000100024 therm | |
| 50 BTU | 0.000500121 therm | |
| 100 BTU | 0.00100024 therm | |
| 1000 BTU | 0.0100024 therm |
Formula: Therm = BTU × 1.0002e-5
Multiply any btu value by 1.0002e-5 to get therm.
Reverse: BTU = Therm × 99,980
Common btu values — factor: 1 BTU = 1.0002e-5 therm
| BTU (BTU) | Therm (therm) | Context |
|---|---|---|
| 1 BTU | 1.000e-05 therm | Match |
| 10 BTU | 0.0001 therm | 10 BTU |
| 100 BTU | 0.001 therm | Space heater second |
| 1,000 BTU | 0.01 therm | 1 kBTU |
| 3,412 BTU | 0.03413 therm | 1 kWh |
| 1e+04 BTU | 0.1 therm | 10 kBTU |
| 1e+05 BTU | 1 therm | 1 therm |
| 1e+06 BTU | 10 therm | 1 MMBTU |
| 1e+07 BTU | 100 therm | 10 MMBTU |
| 1e+08 BTU | 1,000 therm | 100 MMBTU |
| 1.000e+09 BTU | 1e+04 therm | 1 billion BTU |
| 1.000e+10 BTU | 1e+05 therm | 10 billion BTU |
| 1.000e+12 BTU | 1e+07 therm | 1 quad fraction |
| 1.000e+15 BTU | 1.000e+10 therm | 1 quad |
| 1.000e+18 BTU | 1.000e+13 therm | 1000 quads |
1 BTU = 1.0002e-5 therm. Memorize for instant estimates.
Use 1.0002e-5 as a quick mental multiplier.
Multiply result by 99,980 to recover the original BTU value.
Sizes heating and cooling systems rated in BTU/hour for US buildings.
Certifies boiler output and efficiency ratings in BTU/hour.
Prices natural gas supply and usage in BTU and therms.
Calculates heating loads and heat loss in BTU for US properties.
Rates commercial refrigeration and ice-making capacity in BTU.
Specifies heat exchanger capacity and furnace output in BTU/hour.
The British Thermal Unit (BTU) is the traditional Imperial energy unit, defined as the heat required to raise 1 pound of water by 1°F. It equals 1,055.06 joules and has been used since the 19th century in heating, air conditioning, and gas billing.
BTU remains dominant in US HVAC: air conditioners and heaters are rated in BTU/hour. Natural gas is priced in therms (100,000 BTU) in the US. Furnaces are rated in BTU/hour output.
Interesting fact: A typical US home furnace is rated at 80,000–120,000 BTU/hour. One BTU is roughly the energy released by burning one kitchen match. The US natural gas pipeline system delivers about 25 quadrillion BTU (quads) per year.
The therm is a unit of natural gas energy equal to 100,000 BTU (105,480,400 joules). It is the standard billing unit for natural gas in the United States and United Kingdom. The name comes from the Greek thermos (heat).
Gas utilities bill residential and commercial customers in therms in the US and UK. A typical US household uses about 50–100 therms per month in winter. Natural gas furnaces and water heaters are rated in therms per hour.
Interesting fact: One therm of natural gas costs about $1.00–$2.00 in the US. Burning one therm releases about 5.3 kg of CO₂. The US consumes about 28 trillion therms of natural gas equivalent energy per year.
Converting btu to therm is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 BTU = 5.0012e-5 therm and 10 BTU = 0.0001 therm. Reverse: 1 therm = 99,980 BTU. Exact factor: 1 BTU = 1.0002e-5 therm.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.