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The British thermal unit (BTU) is a non-metric unit of energy, used in the United States and, to a certain extent, the UK. The SI unit is the joule (J), which is used by most other countries. A BTU is defined as the amount of heat required to raise the temperature of one pound avoirdupois of water by one degree Fahrenheit; specifying the temperature range over which this happens leads to a number of slightly different BTU values, varying over a range of about 0.5%:

Name	Value (J)	Notes
39°F	≈ 1059.67	Uses the calorie value of water at its maximum density (39.1–39.2°F)
Mean	≈ 1055.87	Uses a calorie averaged over the 32°F to 212°F range
IT	≡ 1055.05585262	The most widespread BTU, uses the International [Steam] Table (IT) calorie, itself defined for water at 14.5°C (58.1°F) by the Fifth International Conference on the Properties of Steam , held in London in July 1956.
59°F	≡ 1054.804	Chiefly American. Uses the 15°C calorie, itself defined as exactly 4185.5 J (Comité international 1950; PV, 1950, 22, 79-80)
60°F	≈ 1054.68	Chiefly Canadian
63°F	≈ 1054.6	Possibly apocryphal
ISO	≡ 1054.5	ISO 31 Quantities and units (?)
Thermochemical	≡ 1054.35026444	(Calculated from 9489.152 380 4 ÷ 9) Uses the thermochemical calorie of exactly 4184 J

The BTU is often used to describe the heat value of fuels, or the heating and cooling capacity of a system (such as a barbecue grill).

One BTU is approximately:

252–253 cal ( calories)
778–782 ft lbf ( feet- pounds-force)
1054-1060 joules

The BTU/hour (BTU per hour) is the unit of power most commonly associated with the BTU.

1 horsepowerThe horsepower hp is the name of several non-metric units of power. In scientific discourse the horsepower is rarely used due to the various definitions and the existence of an SI unit for power, the watt (W). However, the idea of horsepower persists as a is approximately 2500 BTU/hour
1 WattThe watt (symbol: W is the SI derived unit for power. It is equivalent to 1 joule per second (1 J/s), or in electrical units, 1 volt- ampere (1 V · A). It is the rate in joules per second at which energy is being converted, used or dissipated. Equations : is approximately 3.4 BTU/hour
1000 BTU/hour is approximately 290 W

A unit called the quadQuad is a latin prefix meaning four. Tetra is the Greek equivalent). The word quad can mean a number of things: A prefix meaning "four" A quad bike see All-terrain vehicle In architecture, the abbreviation for a quadrangle A play by Samuel Beckett; see Qu (short for quadrillion) is defined as 10¹⁵ BTUs, which is about 1.055×10¹⁸ joules, and the thermThe therm (symbol thm is a non- SI unit of heat energy. It was defined in the United States in 1968 as the energy equivalent of burning 100 cubic feet of natural gas at standard temperature and pressure. In the US gas industry its SI equivalent is defined is defined in the United States and European Union as 100,000 BTU – but the U.S. uses the BTU_59°F whilst the E.C. uses the BTU_IT.

The BTU should not be confused with the Board of Trade UnitThe Board of Trade Unit or B. is a non- SI unit of electrical energy, defined by a former department of the UK government. It is the same as the kilowatt-hour (kWh), which is the amount of energy consumed by a one kilowatt appliance in one hour. or kWh 3. (B.O.T.U.), which is a much larger quantity of energy.

conversion of unitsThis article lists conversion factors between a number of units of measurement. Key: definition exactly equal to approximatively equal to Length Area Volume Angle Mass In physics, the pound of mass is sometimes written lbm to distinguish it from the pound
metrication

Units of energy US customary units Imperial units

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