If you have an iPhone or iPad, you know that there are hundreds of interesting, fun, and useful apps you can download. Many are free, and those that aren’t are extremely inexpensive.

The Mechanical Engineer Formulator app, created by veteran Apple developer Marc Schulman, from Multieducator Inc., New Rochelle, N.Y., allows you to make countless calculations, especially those for fluid power, right from your pocket.

Screen shot from iPhone shows a few of the calculations that can be performed with Mechanical Engineer, from Multieducator Inc. It can be purchased from the Apple iTunes Store for $4.99.

The program contains more than 300 mechanical engineering formulas, over 300 additional conversion formulas, and 70 area formulas. You just finger-touch an item on a menu screen, enter the data required to do the calculation, and click to calculate the results. All the formulas are programmed, and each key formula element is defined.

All formulas can be saved and printed, and you can quickly access recent formulas and tag formulas as favorites. Results can also be e-mailed.

Technologies covered include: fluid power, actuators, bearings, belts, brakes, clutches, gears, heat transfer, refrigeration, shafts, springs, vehicle drives, kinetic energy, metalworking, boilers, elevators, plumbing, and power generation.

Mechanical Engineer is available for $5.99 from the Apple iTunes Store. Hydraulic Engineer, which contains only calculations for hydraulics, is available for $4.99. For more information visit www.multieducator.net, call (914) 235-4340, or e-mail multied@multied.com.