Ohms Law Calc. consists of 52 Calculators with Formulas and Circuits

1.Voltage Calculator
2.Current Calculator
3.Resistance Calculator
4.Power Calculator
- Voltage Drop Calculator (new)
5.kVA to amps (Single Phase)
6.kVA to amps (Three Phase)
7.amps to kVA (Single Phase)
8.amps to kVA (Three Phase)
9.Single Phase Power Calculator
10.Three Phase Power Calculator
11.Single Phase Current Calculator
12.Three Phase Current Calculator
13.DC Horse Power
14.Single Phase Horse Power
15.Three Phase Horse Power
16.DC Current (HP)Calculator
17.Single Phase Current (HP) Calculator
18.Three Phase Current (HP) Calculator
19.Efficiency (DC) Calculator
20.Efficiency (Single Phase) Calculator
21.Efficiency (Three Phase) Calculator
22.Power Factor (Single Phase) Calculator
23.Power Factor (Three Phase) Calculator
24.Luminous Intensity Calculator
25.Luminous Flux Calculator
26.Solid Angle Calculator
27.Energy Cost Calculator
28.Energy Storage (Resistance) Calculator
29.Energy Storage (Inductance) Calculator
30.Energy Storage (Capacitance) Calculator
31.Star to Delta Conversion
32.Delta to Star Conversion
33.Inductive Reactance Calculator
34.Capacitive Reactance Calculator
35.Resonant Frequency Calculator
36.Inductor Sizing Equation
37.Capacitor Sizing Equation
38.Resistance (Series) Calculator
39.Resistance (Parallel) Calculator
40.Inductance (Series) Calculator
41.Inductance (Parallel) Calculator
42.Capacitance (Series) Calculator
43.Capacitance (Parallel) Calculator
44.UnKnown Resistance (Series) Calculator
45.UnKnown Resistance (Parallel) Calculator
46.UnKnown Capacitance (Series) Calculator
47.UnKnown Capacitance (Parallel) Calculator
48.Neutral Current (3Ph) Unbalanced Loads
49.Characteristic Impedance (parallel)
50.Characteristic Impedance (coaxial)
51.Transformer Calculator
52.Voltage Divider & RMS Calculations

a.Change unit from amps to milliAmps or vice versa, the output Voltage is calculated instantly
b.Changes can be made to input units
c.Changes can be made to output units.

What’s New

Version 9.3

- wire sizes in added to Voltage drop Calculator.
Two more calculations added:
- Voltage Divider
- RMS Voltage Calculations for sine wave, square wave, triangle wave, saw-tooth,half wave & full wave.

Ratings and Reviews

4.6 out of 5
375 Ratings

375 Ratings

Jim Mol ,

Free basic calculations for EV owners and a whole lot more!

This app is fine for basic current and power calculations an electric car driver may need to figure recharging times. They are free along with voltage and power calculations.
But I needed more: voltage drop over a 50 foot Extention cord that the EV charger is connected to. For a few dollars more, that is available plus a whole host of other calculations.
Then there is the conversion side, which I do not use. You get Field Strength, Electrical Potential and Resistance for free but must pay a dollar to unlock the rest.
Whether EV driver or dabbling in electronics, this may be the app for which you have been looking.

Developer Response ,

Dear Jim,
We will accommodate the features, you asked for, in our next update.

Mary and gary ,

Neat little tool

If you work with relays or any electrical circuits this is a real time saver. Sure all of us know ohm's law, but it seems like we usually need to take the time to figure what gets divided by what to get the result. This does all the work in seconds and can do a wide variety of different calculations.

RPD1000 ,

Paid but not unlocked - no response

I downloaded this application to my Ipad because it looked very useful. I paid the $3.99 immediately Days later It is still locked and I can’t get any response from them via email. Because of their lack of response and the fact that it has ads and offers I don’t consider this a functional product that I can recommend.

Developer Response ,

Dear Customer,

We regret for the inconvenience.Kindly click on the "restore" button to unlock the in-App purchases. If that doesn't help you. contact us at

with regards,

In-App Purchases

54 Electrical Calculators
Open all Calculators in the App & remove Ads.

App Privacy

The developer, V PUGAZHENTHI, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


17.6 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, French, German, Italian, Portuguese, Simplified Chinese, Spanish

Age Rating
In-App Purchases
  1. 54 Electrical Calculators $3.99
  2. 16 - Electrical Converters $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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