Based on this, you can convert KPH to MPH by dividing the KPH measurement by 1.60934. For example, let’s say you want to convert 140 KPH to mph: 140 KPH / 1.60934 = 87 MPH. Alternatively, you can also multiply the KPH figure by 0.62137 to convert it into its MPH equivalent: 140 KPH x 0.62137 = 87 MPH.