# Pump Capacity Calculator

## What is Pump Capacity

Pump capacity, also known as flow rate or volume flow rate, is the volume of fluid that a pump is able to move per unit of time. It is typically measured in units of volume per time, such as gallons per minute (GPM) or liters per second (L/s).

There are several factors that can affect the capacity of a pump, including the size and design of the pump, the type, and viscosity of the fluid being pumped, and the pressure at which the pump is operating.

## Pump Capacity Calculation Formula

To calculate the pump capacity, you will need to know the following information:

- The speed of the pump (in revolutions per minute or RPM)
- The displacement of the pump (in cubic inches or cm^3)
- The efficiency of the pump

With this information, you can use the following formula to calculate the pump capacity:

**Capacity (gpm)** = (Displacement (in^3/rev) * RPM) / (231 * Efficiency)

For example, if a pump has a displacement of 0.05 cubic inches (0.82 ml) per revolution, is running at 1200 RPM, and has an efficiency of 70%, the capacity would be:

**Capacity (gpm)** = (0.05 in^3/rev * 1200 RPM) / (231 * 0.7) = 12 gpm