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How many femtojoule in 1 Btu?
The answer is 1.0550559E+18.
We assume you are converting between femtojoule and British thermal unit.
You can view more details on each measurement unit:
femtojoule or Btu
The SI derived unit for energy is the joule.
1 joule is equal to 1.0E+15 femtojoule, or 0.00094781707774915 Btu.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between femtojoules and Btus.
Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from Btu to femtojoule, or enter any two units below:
femtojoule to foot poundal
femtojoule to quad
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femtojoule to megajoule
femtojoule to liter atmosphere
femtojoule to kilopond meter
femtojoule to petajoule
femtojoule to yottawatthour
femtojoule to foot pound
femtojoule to pferdestärkenstunde
The SI prefix "femto" represents a factor of 10-15, or in exponential notation, 1E-15.
So 1 femtojoule = 10-15 joules.
The definition of a joule is as follows:
The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honor of the physicist James Prescott Joule (1818-1889).
The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it isgenerally only used for heating systems). The SI unit is the joule (J), which is used by most other countries.
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