basic

Enthalpy of Formation from Combustion Data Calculator

ΔH_f°(fuel) = Σ ΔH_f°(products) − ΔH_combustion.

Compute a fuel's standard enthalpy of formation from its measured heat of combustion and the tabulated standard enthalpies of formation of the combustion products (CO₂ and H₂O). For C_aH_b: ΔH_f°(fuel) = a·ΔH_f°(CO₂) + (b/2)·ΔH_f°(H₂O) − ΔH_combustion. Defaults model methane (CH₄, a=1, b=4).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

kJ/mol
kJ/mol
kJ/mol

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ΔH_f°(fuel) = a·ΔH_f°(CO₂) + (b/2)·ΔH_f°(H₂O) − ΔH_combustion.

In depth

Compute a fuel's standard enthalpy of formation from its measured heat of combustion and the tabulated standard enthalpies of formation of the combustion products (CO₂ and H₂O). For C_aH_b: ΔH_f°(fuel) = a·ΔH_f°(CO₂) + (b/2)·ΔH_f°(H₂O) − ΔH_combustion. Defaults model methane (CH₄, a=1, b=4).