Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Specify HHV or LHV consistently. This does not identify fuels, design combustion equipment or predict emissions.
Example Calculation
- Fuel mass: 2 kg
- Specified combustion energy: 40 MJ/kg
- Recovered heat fraction: 80 %
Fuel mass = 2; Specified combustion energy = 40; Recovered heat fraction = 80. Primary result: 80.
Frequently asked questions
How do I use this calculator?
Enter fuel mass, specified combustion energy, recovered heat fraction. The result updates automatically. Use Reset to restore the example values.
What method does it use?
released=mass ×specific energy; recovered=released ×recovery.. Specify HHV or LHV consistently. This does not identify fuels, design combustion equipment or predict emissions.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.