Energy from Coal

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Equation / Last modified by KurtHeckman on 2018/04/12 14:53
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The Energy from Coal calculator computes the amount of electrical energy produced by an amount of coal (Mc), the specific energy of coal and an efficiency factor.

INSTRUCTIONS: Choose units and enter the following:

  • (Mc) This is the amount of coal
  • (ef) This is the efficiency of coal energy conversion.

Energy from Coal (Ec):  The calculator returns the energy in kiloWatt-hours.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The specific energy of coal is 25 Mj/kg.  The formula for the Energy from Coal is:

     Ec = Mc • SEc • ef


  • Ec is the energy from coal
  • Mc is the amount (mass) of coal
  • SEc is the specific energy of coal (25 Mj/kg)
  • ef is the efficiency of conversion factor

Note: a modern power station has an efficiency of about 30%.

Scientific Attribution: Special thanks to William Burt (Energy consultant and Project Engineer) for his Energy in Coal answer on Quora that is the basis of this calculator.