Mechanical advantage (M.A) of a machine is the ratio of its load to effortMathematicallyMechanical advantage (M.A) = Load (L) ÷ Effort (E)In symbol M.A = L/ENote:Mechanical (advantages has no S.I unit)If M.A = 4 then,L/E = 4/1The ratio of load to effort = 4 : 1 respectively