Ohm's Law

3.55K reviews
Content rating
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About this app

Two common calculators for electronics/electrical use:

Ohm's law calculator/Watt's Law calculator: figures any 2 unknown values given 2 known values

Resistor calculators: figures bands given value or value given bands. For 3, 4, & 5 band resistors

* Preferences/lock functions allow values to either autorange to appropriate SI units or remain fixed

* Resistor calculator automatically determines 3, 4, or 5 band

* Clean, intuitive interface

*** To the few who have commented that it's "stupid" to have the "Rate" button where it is, please stop && think. You don't HAVE to rate it before using it, nor are you even being asked to. You will notice that there are 2 buttons. This is the "About" dialog that is shown the first time you run any new version or tap the "About" menu item. Please think before you speak. Thank you. ***

Paid app "Electrist" identifies EIA standard values, as well as adds many more calculations. See for yourself:
Updated on
Mar 3, 2012

Data safety

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Ratings and reviews

3.44K reviews
A Google user
November 13, 2019
The application works & is accurate. But the Guide is why I got it. I always forget the formulae, in spite of 40+ years' experience. (Age, i guess) --------------- It is big print, so even I can read the screen. One addition that would be appreciated is, when calculating power, if the option to calculate 3 phase watts when voltage and amperage are entered. (And visa-versa. Insert power and voltage to get 3 phase watts.) And, if I may be greedy, install a power factor calculation. Oh Wait- My phone has a calculator...
4 people found this review helpful
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Adam Davies
March 7, 2021
Very simple to use and quicker than my calculator. Adding recommended cable size to the standard Ohm's pyramid would make it perfect.
2 people found this review helpful
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Joshua Norris
May 4, 2022
Excellent! It just makes it easy. I have this stuff memorized, but sometimes it's just easier to plug in numbers and GO!
1 person found this review helpful
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What's new

1.71 [Mar 3, 2012]
+ added some exception handling and better handling of parsing numbers from input strings