Air–fuel Ratio

Air–fuel ratio, abbreviated as AFR, is the mass ratio of air to fuel mixture present in an internal combustion engines.  Because it is a ratio, it is unitless.

 

Air–fuel ratio calculator

Air–fuel ratio formula \(\large{ AFR = \frac {m_a} {m_f} }\)    Where: \(\large{ AFR }\) = air–fuel ratio \(\large{ m_a }\) = air mixture \(\large{ m_f }\) = fuel mixture