From Spire Web & Design:
The PMC Group Hydraulic Calculator is a comprehensive collection of calculations for the hydraulic engineer. The calculator contains calculations for pumps, motors, cylinders and accumulators. It is also including calculations for fluid velocity and pressure drop in piping and orifices, and calculations for heat generation as a result of pressure drop in the hydraulic system. A unit converter for the most common units used in hydraulic engineering is also included.