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How Do You Calculate PSI? The psi, or pounds per square inch, is a unit of pressure (P) using the foot-pound-second (FPS) system. To calculate psi, divide the force applied (F) with the area (A). Measure the force applied. Use an instrument such as a force gauge, spring scale or strain gauge. Make sure that the unit is in pounds.


Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2. In the foot-pound-second (FPS) system, the units are pounds per square inch, or psi.


Pounds per square inch (psi) is a unit of pressure most commonly associated with tire pressure for an automobile or bike tire. However, because pressure gauges are attached to most tire pumps, there's often very little need to calculate psi in this context.


How to Calculate GPM from PSI for Water ... This example will calculate the flow rate of water draining from a tank through a pipe with cross sectional area of 0.500 square feet. The pressure inside the tank is 94.0 psi and the pressure at the exit is atmospheric pressure, or 14.7 psi.


The chart gives you the pressure just at the discharge of the pump. If after the pump, your pipe goes upward, The pressure on the top is less than that. Add friction too, though friction can be reduced to a small value. If the pipe goes horizontally, The psi of the end of the pipe is something between 5.0 and 6.0 psi.


If you have to pump water to the fifth floor of an apartment building, and want to have 45-psi water pressure available to the occupants, you can determine the minimum pump pressure required at ground level. If the fifth floor is 55-feet high, then divide 55-feet by 2.31-feet/psi to determine the head loss of pushing the water up five floors.


Therefore, if flow doubles, pressure has usually had to quadruple to affect the change in a flowing system. Manufacturers of different types of piping publish flow-pressure data about their products. You can use this data to calculate GPM from pounds per square inch (PSI).


Use this calculator to determine the pressure generated by a force acting over a surface that is in direct contact with the applied load. A conversion scale of incremental vales of force and pressure connected with the selected parameters will also be shown. Applied Force


The above form works if you are measuring differential pressure, such as the difference in psi between two points. It also gives the correct answer for absolute pressure, assuming you are measuring psia, which is the pressure relative to absolute zero vacuum.


How Do You Convert PSI Water Pressure to Gallons Per Minute? You cannot directly convert PSI to GPM. They are two different units of measure. ... Using the equation Q = V * A, calculate the velocity. Q is the volumetric flow rate, V is the velocity of the fluid and A is the cross-sectional area of the pipe. Similar Articles.