Tire pressures are stated by manufacturers in bars or pounds per square inch, or psi. Knowing the equivalent pressure of a bar value in psi necessitates knowing how to convert between the two scales. Having the correct tire pressure can increase the life of your tires; improve your fuel efficiency and improve the handling of your vehicle. A simple mathematical formula converts tire pressures expressed in bars into pressures expressed in psi.
Enter the tire pressure value into the calculator. For a 2.5 bar tire, enter 2.5. The bar, a metric value used widely in industry and science, is the international unit of pressure.
Multiply the tire pressure in bars by 14.50378. One bar is 14.50378 psi, so multiplying by 14.50378 will convert the bar value to psi. For example, 2.5 bars multiplied by 14.50378 gives a tire pressure just over 36 psi. Write down the answer.
Check the calculation for errors. Divide the answer by 14.50378 to convert the psi pressure back into bars. If you entered the values correctly, the result will be the number of bars with which you started. If not, repeat the calculation.
