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.
- Mass basis only. Enter the correct stoichiometric ratio for the fuel; 14.7 is an illustrative input, not a universal specification.
Example Calculation
- Air mass: 14.7 kg
- Fuel mass: 1 kg
- Stoichiometric AFR: 14.7
14.7 kg air and 1 kg fuel at a stoichiometric AFR of 14.7 give lambda 1.
Frequently asked questions
How do I use this calculator?
Enter air mass, fuel mass, stoichiometric afr. The result updates automatically. Use Reset to restore the example values.
What method does it use?
AFR=m_air/m_fuel; lambda=AFR/stoichiometric AFR.. Mass basis only. Enter the correct stoichiometric ratio for the fuel; 14.7 is an illustrative input, not a universal specification.
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.