Nice app, easy to use and pretty comprehensive. One suggestion would be to allow the user to switch units on the fly. Essentially, either while inputting the value or reading the result the user could simply tap and change the units. For example tap the units for pressure and change from psi to bar. I regularly work with vendors overseas and customers in the US. Conference calls are fun when the vendor tells me the the displacement in ccm and the customer is telling me the pressure in PSI and everyone is asking about the motor’s torque output. Of course they want the answer in ft-lbs and Nm.

I've had this app for about 2 or 3 years and I use it several times a week in the course of my job. I do functional integration of industrial hydraulic systems. Being able to quickly calculate the required HP for a system is invaluable when you're running a new and untested system (contrary to beliefs, engineers constantly fail to do this when specs are made and a unit will be underpowered or over worked). I also have two other hydraulic apps from these guys and I guarantee you'll love them if you're around hydraulics and need quick calculations. Can't recommend them highly enough and I've even had my company's monthly newsletter include screenshots and info regarding these apps so all the employees are aware of how useful they are in our profession.

Awesome app!

Useless without paying.