Boiler System Sizing Calculator
The Boiler System Sizing Calculator finds the boiler capacity (kW/BHP) and fuel consumption from steam demand, pressure, and feedwater temperature. Example: for a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel, Boiler capacity = 422.5 kW, Boiler HP = 43.1 BHP, Fuel use = 49.9 L/h (per ASME BPVC Sec.I/IV | ASME B31.1).
How it works
Computed from your inputs per ASME BPVC Sec.I/IV | ASME B31.1.
Worked example (Boiler & Utilities)
Inputs: a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel.
| Result | Value |
|---|---|
| Boiler capacity | 422.5 kW |
| Boiler HP | 43.1 BHP |
| Fuel use | 49.9 L/h |
Computed live by WorkHive's calculation engine; standard: ASME BPVC Sec.I/IV | ASME B31.1.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a steam boiler delivering 500 kg/h at 7 barg from 80 °C feedwater on diesel.
- The calculator returns Boiler capacity, Boiler HP, Fuel use, computed per ASME BPVC Sec.I/IV | ASME B31.1.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a boiler sizing calculator kW fuel consumption?
The Boiler System Sizing Calculator is a free online tool that computes finds the boiler capacity (kW/BHP) and fuel consumption from steam demand, pressure, and feedwater temperature. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following ASME BPVC Sec.I/IV | ASME B31.1. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Boiler System Sizing Calculator in WorkHive: free, no sign-up needed for the calculators.