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  • #: 233061
  • Price: $2.99 In Apple Store
  • Category: Productivity
  • Updated: 2008-08-15
  • Current Version: 1.1
  • 1.1
  • Size: 0.10 MB
  • Language: English
  • Seller: West Side Systems, LLC
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 2.0 or later
  • © 2008 West Side Systems, Eric Cornwell
  •  Add to Favorite apps



PowerCalc performs basic electrical power calculations with watts, volts, amps, and motor power factor. It works in three modes:

DC mode - simple watts, volts, amps calculations. Set the voltage, then enter a wattage to determine the electrical current drawn in amps. Or enter the rated ampacity of a device and see maximum wattage load.

AC Resistive mode - (incandescent lighting, heaters) - same as above, plus the ability to choose 1, 2, or 3 phase power service and calculate load distribution across phases.

AC Inductive mode - (motors and fluorescent lighting) - adds power factor, and calculates inductive loading. Choose single phase or three phase power.

Works for any voltage, in any country.

(Note that some reviews refer to version 1.0, which did not support the inductive power calculations included in this version.)

iPhone Screenshots

PowerCalc iPhone Screenshot 1
PowerCalc iPhone Screenshot 2

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Rated 1/5 based on 3 customer reviews.


0/5 stars

Wrong formula.

The 3 phase RESISTIVE formula for Watts is wrong. Should be

(SQUARE ROOT OF 3; NOT 3) x volts x amps = W.

0/5 stars

Calculations are Incorrect

Only works for single phase and dc power. The 3 phase calulations are off formula should be watts/volts/1.73 = amps not watts/volts/3. And there is no such thing as two phase power. Nifty tool idea. Wish they would update.

4/5 stars

I like the program, but...

It seem to work well on the smaller single-phase answers. I haven't tried the 3-phase test too much, so I cannot speak directly to that or to the newer features for inductive or DC. The other apps produced by this company seem to work well, though, so if there are math errors, it is probably an oversight.

I like the large display, etc. What I don't like is that there is no ability to zero out all of the fields. You can zero watts and amps, but volts only "zero" to one. I'm not speaking to calculate zero values but to simply clear the formulas to help reset things for later use.

As to the complaints about the higher/lower voltages: I would say that we calculate to have clarity of the amp/voltage draw. In the technical theatre world, we DO calculate this extensively. We don't need a limitation of 50V, which is not practical. I use 120 and some 115/110 in older situations. It is necessary to calculate 3-phase for some distributions. So the "if you have to calculate it, you don't need it" is not accurate. However, we DON'T need the ability to calculate the distribution on a 500,000v substation either, so that's not practical.

Many of you are missing the point of this program and its functionality. If it's falling in line with the other programs developed by West Side, it's for the purposes of theatre applications, not electrical contracting. His BeamCalc and DMXCalc are perfect examples of this.


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The information may be outdated (2011-04-30 16:35:25). For actual information go to iTunes

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