Formula & worked example
msteam=Qfuel·η/(hsteam−hfeed).
A 1,000 kW fuel input at 85% efficiency with a 2,400 kJ/kg enthalpy rise produces about 1,275 kg/h steam.
Plant engineering calculator · Updated Sep 17, 2026
Boiler Steam Output Calculator — Fuel Input, Efficiency & Steam Generation
Estimate useful boiler duty and steam generation from fuel input, boiler efficiency, feedwater enthalpy and steam enthalpy.
Inputs
Live engineering result
Useful boiler duty 850 kW
Enthalpy rise 2,400 kJ/kg
Steam generation 1,275 kg/h
Equivalent evaporation 1.275 t/h
Assumptions & limits
- Use lower- or higher-heating-value efficiency consistently with the fuel input basis.
- Enthalpies should come from verified water/steam properties for the actual states.
Frequently asked questions
What does this Boiler Steam Output Calculator calculate?
Estimate useful boiler duty and steam generation from fuel input, boiler efficiency, feedwater enthalpy and steam enthalpy.
Can I use the result for equipment selection?
Use the result as an engineering screening and cross-check. Confirm final selections against manufacturer performance data, design conditions, applicable standards and local code.
Why does MAXScanner show assumptions?
Plant calculations can move materially with pressure, temperature, fluid properties, diversity and operating conditions. Visible assumptions make the result auditable.