To calculate Force must know some parameter like average effective pressure and other data. Pressure indicator P_{i} can be calculated, the data should know such as:

D = cylinder diameter

P_{mi} = average effective pressure, N/m^{2}

S = piston cylcle, m

N = motor speed in rpm

i = number of cylinder

Formula to calculate indicator pressure of gasoline engine 4 cycles is:

P_{i} = 0.785 . D^{2 }. P_{mi} . S . 0.5 . N . I (Watt), if divide by 1000 the unit equal with kW (kilowatt).

Average pressure effective indicator P_{mi} work in every part of piston surface and result piston force, where P_{mi} = piston area, piston surface area is 0.875 . D^{2} and the piston force is 0.875 . D^{2} . P_{mi}. Surface of piston expressed in m^{2} and average effective pressure indicator express in N/m^{2}, so Force will represent by N unit.

The force that work on all cycle are as follows:

Work = Force x Distance

Work on cylinder = Force

Other piston cycle = 0.785 x D^{2} x P_{mi} x S

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