Heat rate and efficiency converter

Convert a generator or power plant heat rate in Btu/kWh, kJ/kWh or MJ/kWh to electric efficiency in percent, and back.

Heat rate or efficiency

\eta = \frac{3{,}412\ \mathrm{Btu/kWh}}{\mathrm{HR}} = \frac{3{,}600\ \mathrm{kJ/kWh}}{\mathrm{HR}}

Heat rate is the fuel energy needed to make 1 kWh of electricity, so a lower heat rate means higher efficiency. 3,412 Btu is the energy in 1 kWh.

Keep the fuel heating value basis the same (higher heating value, HHV, or lower heating value, LHV) when you compare heat rates or efficiencies.

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.