Ohms Law Calc. consists of
1.Voltage Calculator
2.Current Calculator
3.Resistance Calculator
4.Power Calculator
5.kVA to amps (Single Phase)
with Formula & Multiple Units.
More Calculators available for in-App Purchase :
- Voltage Drop Calculator( SI & USCS Standards for wire size )
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

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 8.2

Share any calculation done in the App, with an appropriate screen size.

Ratings and Reviews

4.6 out of 5
226 Ratings

226 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.

Sparky952 ,

Stupid pop ups

I just payed for all 49 calculators. From the first time I used it, this rate me window popped up EVERY TIME I tried to use it. How can I rate it if I haven’t used it? Otherwise I would have given a fair rating in a few days.

Developer Response ,

Dear Spark,

The issue with rating popups have been addressed in the latest version.Thanks for pointing out this issue.
with regards,

V Pugazhenthi

In-App Purchases

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


15.6 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
Rated 4+
© All Rights Reserved
In-App Purchases
  1. 49 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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