The most accurate way to compare different fuels and boilers is to find the cost of unit useful energy. This tool calculates the cost of 1 MJ, 1 kWh and 1,000 kcal of useful heat for a given fuel price per ton.
Formula
Ce = 100 × Cf ÷ (Hu × η)
Cf: ton price of fuel, Hu: lower calorific value (kJ/kg), η: boiler efficiency (%).
Example
If a fuel with a lower calorific value of 42,000 kJ/kg and a ton price of 30 units is burned with 90% efficiency, the cost of 1 MJ of useful energy is 0.000794 units.