Ohms Law Calc.
Wire Size & Voltage Drop
How much does Ohms Law Calc. cost?
Prices are current as of 2 Oct 2026.
1 one-time purchase from $3.99
In the United States, Ohms Law Calc. has 1 one-time purchase priced $3.99.
| Product | Price |
|---|---|
| Ohms Law Calc. | $3.99 |
10+ alternatives to Ohms Law Calc.
| Ohms Law Calc. |   Southwire® Voltage Drop Calc |   Southwire® Conduit Fill Calc |   ElectriCalc Pro |   PLC Simulator 2, Ladder Logic |   Mike Holt's Electrical Toolbox |   PLC Simulator, PLC Trainer |   Watts Amps Volts Calculator |   Ohm & Watt Law Electrical Calc |   Calctronics: Circuit Calc |   Resistor Calc+ | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rating / 5 | 4.7 | 4.6 | 4.5 | 4.9 | 4.7 | 4.6 | 3.8 | 4.5 | 4.4 | 3.9 | 4.5 |
| Reviews | 3.4K | 1.7K | 765 | 648 | 229 | 203 | 157 | 154 | 143 | 86 | 84 |
| Released | 2012 | 2011 | 2012 | 2012 | 2023 | 2019 | 2018 | 2011 | 2019 | 2021 | 2018 |
| One-time price | $3.99 | — | — | — | — | — | — | — | — | — | — |
The going rate for each plan in United States, in its own currency, shaded from the cheapest price on the row to the dearest.
Ohms Law Calc. reviews
4.7 out of 5, based on 3,351 reviews.
What people like
- Clean and simple user interface
- Saves time on basic calculations
- Free version works perfectly for basics
What they complain about
- Support never replies to emails
- Paid features stay locked after purchase
- Keeps crashing when you open it
Great
Ive had the app for a while now and its definitely come a long way and its looking great. I’m a journeyman electrician and the app has been very useful. The dev is also really great at responding to feedback and making improvements. Highly recommend, for less then a coffee its a great deal.
No easy to use
Just trying to calculator multiple resistors in parallel. Thought I used to be able to use this app. Could figure it out now. Went to web based calculator which was much easier.
Bom
Gostei do programa
Annoying
I’ve purchased the unlocked content and parameters but still have adds and every time I try to access one of the unlocked areas I get prompted to buy now??? Sort this out or refund me please!!!
I have purchased the app in the past and now I have to pay again ????
App was purchased 2 years ago. They made an update recently and now I have to buy again the app that I have already purchased. This is stealing. This is fraud! Give me acces back to the app that I have already paid for.!!!!
Ohms law call.
Great value. Works perfectly
Took my money and hasn’t unlocked!??
I paid to unlock other calculators and it hasn’t worked. I tried to „restore purchase“ within the app and I get „unknown error“. I try to email the developer within the app, and just get an error. This is ridiculous, I’ve literally paid for nothing. Please resolve this asap, I’m complaining to Apple about this
Nice app for electrical engineers
I found almost all the major electrical conversions here. Easy to use and simple UI
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.
Electrical Engineer
The apps looks great ! Just one thing, the Ohms Law & Formulas looks to be incorrect. I think they some how got mixed up between (E and P ) the formula for Voltage should not be "V = E/I". The use of V and E should not be expressed in the formula. Stick to just using "E" to represent voltage.
Best thing since sliced bread.
Best this since sliced bread.
坑
卸载
Risultati
Per il mio utilizzo da principiante la trovo molto interessante.grazie
Needs more work yet.
Don’t buy the pack. Would not work after buying. Keeps shutting down. But the free bit is ok.
It works but...
Yes it does the calculations but the problem with it on my iPhone 3s is the input keyboard overlays the results which makes it difficult to see. I can't find any way to turn off the keyboard so you can clearly see the calculations. If you look close at the screen shots above you will see it is overlaying the formulas, clear button and what looks to be a function button. It's free but not sure it's real useful.
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.
App keeps trying to repeatedly charge me after I already paid for full version
Not sure if it’s a bug but there’s no point to paying the $3.99 fee if I’m getting prompted to pay for it each time I try to use it
Simple calculator
Any EE student would be able to perform these task easily with a calculator. Not worth it the download, it does however do what it "says" which is a simple Ohms Law calculator.
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.
Disappointed
This app is not worth the $4. I have been in the electrical trade for over 25 years and can do the math on my own but thought this would make quick work of calcs, but the more I play with it the more I get puzzled. I would not recommend buying this if you live in the US.
This app is excellent!!!!!!
It is so helpful! This is the best app I've got!!! It helps so much with electronics I do! Thanks :)
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.
POLC
Very handy useful calculator...
Annoying
Rated 1 star because after paying it asks you to rate with every window change and every calculation.
Excellent
Clear, simple and professional approach to providing the answers you need without having to remember the formulae. Couldn't be easier or more straightforward. The interface is clean and pleasing. The display icon is the same and doesn't look like it was drawn by a child. The four most important electrical formulae you need, right at your fingertips. Surprised no ratings before this one, as I'm sure this must be handy for many people, even of you only needed it to work out the current your various battery chargers or devices use! As with most things, many people forget to rate something they are satisfied with, and much more likely to rate something they dislike. As its free, one can hardly go wrong. A very handy little calculator. Now in my 'calculators' group. Would be even better if kVA, rms and other popular needed conversions were added, but as it states, it is just Ohm's law.
Worst Ohms calculator ever seen
dont waste your time downloading it.
Best
This is a terrific app!!
Needs more
I need to put in voltage and resistance to gets amps and watts. Please fix!
Very helpful
This is just the kind of app I was looking for.. Very useful and easy to use. And its free too..
Not that great
Very useful for college but it constantly closes its self during use. Its free and that in its self shows what you get
Ohms Law Calc. price by country
A one-time purchase costs $3.51 in Canada and $5.97 in Colombia — 1.7× more for the same thing. Below is the going rate for each plan in every country that sells it — the middle price of what the app charges there, in the country's own currency with the dollar equivalent beneath it.
| Country | One-time |
|---|---|
| Afghanistan | $3.99 |
| Albania | $4.99 |
| Algeria | $3.99 |
| Angola | $3.99 |
| Anguilla | $3.99 |
| Antigua And Barbuda | $3.99 |
| Argentina | $3.99 |
| Armenia | $4.99 |
| Australia | A$5.99$4.31 |
| Austria | €3.99$4.52 |
| Azerbaijan | $4.99 |
| Bahamas | $3.99 |
| Bahrain | $3.99 |
| Barbados | $4.99 |
| Belarus | $4.99 |
| Belgium | €3.99$4.52 |
| Belize | $3.99 |
| Benin | $4.99 |
| Bermuda | $3.99 |
| Bhutan | $3.99 |
| Bolivia | $3.99 |
| Bosnia & Herzegovina | €3.99$4.52 |
| Botswana | $3.99 |
| Brazil | R$24.90$4.79 |
| British Virgin Islands | $3.99 |
| Brunei Darussalam | $3.99 |
| Bulgaria | €3.99$4.52 |
| Burkina Faso | $3.99 |
| Cambodia | $3.99 |
| Cameroon | $4.99 |
| Canada | CA$4.99$3.51 |
| Cape Verde | $3.99 |
| Cayman Islands | $3.99 |
| Chad | $3.99 |
| Chile | CLP 4,990$5.13 |
| China | CN¥28.00$4.17 |
| Colombia | COP 19,900$5.97 |
| Congo | $4.99 |
| Congo, Democratic Republic | $3.99 |
| Costa Rica | $3.99 |
| Cote Divoire | $4.99 |
| Croatia | €3.99$4.52 |
| Cyprus | €3.99$4.52 |
| Czech Republic | CZK 99.00$4.59 |
| Denmark | DKK 39.00$5.92 |
| Dominica | $3.99 |
| Dominican Republic | $3.99 |
| Ecuador | $3.99 |
| Egypt | EGP 199.99$3.85 |
| El Salvador | $3.99 |
| Estonia | €3.99$4.52 |
| Fiji | $3.99 |
| Finland | €3.99$4.52 |
| France | €3.99$4.52 |
| Gabon | $3.99 |
| Gambia | $3.99 |
| Georgia | $4.99 |
| Germany | €3.99$4.52 |
| Ghana | $4.99 |
| Greece | €3.99$4.52 |
| Grenada | $3.99 |
| Guatemala | $3.99 |
| Guinea-bissau | $3.99 |
| Guyana | $3.99 |
| Honduras | $3.99 |
| Hong Kong | HK$32.00$4.08 |
| Hungary | HUF 1,790$5.54 |
| Iceland | $4.99 |
| India | ₹399.00$4.16 |
| Indonesia | IDR 79,000$4.41 |
| Iraq | $3.99 |
| Ireland | €3.99$4.52 |
| Israel | ₪12.90$4.20 |
| Italy | €3.99$4.52 |
| Jamaica | $3.99 |
| Japan | ¥600$3.81 |
| Jordan | $3.99 |
| Kazakhstan | KZT 2,490.00$5.66 |
| Kenya | $4.99 |
| Kosovo | €3.99$4.52 |
| Kuwait | $3.99 |
| Kyrgyzstan | $3.99 |
| Lao Peoples Democratic Republic | $3.99 |
| Latvia | €3.99$4.52 |
| Lebanon | $3.99 |
| Liberia | $3.99 |
| Libya | $3.99 |
| Lithuania | €3.99$4.52 |
| Luxembourg | €3.99$4.52 |
| Macao | $3.99 |
| Macedonia | $3.99 |
| Madagascar | $3.99 |
| Malawi | $3.99 |
| Malaysia | MYR 19.90$4.88 |
| Maldives | $3.99 |
| Mali | $3.99 |
| Malta | €3.99$4.52 |
| Mauritania | $3.99 |
| Mauritius | $4.99 |
| Mexico | MX$89.00$4.92 |
| Micronesia | $3.99 |
| Moldova | $4.99 |
| Mongolia | $3.99 |
| Montenegro | €3.99$4.52 |
| Montserrat | $3.99 |
| Morocco | $4.99 |
| Mozambique | $3.99 |
| Myanmar | $3.99 |
| Namibia | $3.99 |
| Nauru | $3.99 |
| Nepal | $4.99 |
| Netherlands | €3.99$4.52 |
| New Zealand | NZ$6.99$3.95 |
| Nicaragua | $3.99 |
| Niger | $3.99 |
| Nigeria | NGN 6,900.00$5.19 |
| Norway | NOK 49.00$5.10 |
| Oman | $3.99 |
| Pakistan | PKR 1,100$3.97 |
| Palau | $3.99 |
| Panama | $3.99 |
| Papua New Guinea | $3.99 |
| Paraguay | $3.99 |
| Peru | PEN 17.90$5.20 |
| Philippines | ₱249.00$3.97 |
| Poland | PLN 19.99$5.19 |
| Portugal | €3.99$4.52 |
| Qatar | QAR 14.99$4.12 |
| Romania | RON 19.99$4.30 |
| Russia | RUB 349.00$4.17 |
| Rwanda | $3.99 |
| Sao Tome & Principe | $3.99 |
| Saudi Arabia | SAR 17.99$4.80 |
| Senegal | $4.99 |
| Serbia | €3.99$4.52 |
| Seychelles | $3.99 |
| Sierra Leone | $3.99 |
| Singapore | SGD 5.98$4.67 |
| Slovakia | €3.99$4.52 |
| Slovenia | €3.99$4.52 |
| Solomon Islands | $3.99 |
| South Africa | ZAR 79.99$4.87 |
| South Korea | ₩6,600$4.87 |
| Spain | €3.99$4.52 |
| Sri Lanka | $3.99 |
| St. Kitts and Nevis | $3.99 |
| St. Lucia | $3.99 |
| St. Vincent & The Grenadines | $3.99 |
| Suriname | $3.99 |
| Swaziland | $3.99 |
| Sweden | SEK 49.00$4.90 |
| Switzerland | CHF 3.00$3.59 |
| Taiwan | NT$120.00$3.76 |
| Tajikistan | $3.99 |
| Tanzania | TZS 11,900.00$4.49 |
| Thailand | THB 149.00$4.44 |
| Tonga | $3.99 |
| Trinidad and Tobago | $3.99 |
| Tunisia | $3.99 |
| Turkey | TRY 199.99$4.08 |
| Turkmenistan | $3.99 |
| Turks and Caicos | $3.99 |
| Uganda | $4.99 |
| Ukraine | $4.99 |
| United Arab Emirates | AED 14.99$4.08 |
| United Kingdom | £3.99$5.29 |
| United States | $3.99 |
| Uruguay | $3.99 |
| Uzbekistan | $3.99 |
| Vanuatu | $3.99 |
| Venezuela | $3.99 |
| Vietnam | ₫119,000$4.59 |
| Yemen | $3.99 |
| Zambia | $4.99 |
| Zimbabwe | $4.99 |
Ohms Law Calc. FAQ
- Is Ohms Law Calc. free?
- Yes. The app and its basic features are free, in all 175 countries it sells in. Premium features are paid: they start from $3.99 (US), across 1 one-time purchase.
- Does Ohms Law Calc. have a free trial?
- No. None of its offers (US) come with a free trial.
- Where is Ohms Law Calc. cheapest?
- A one-time purchase costs CA$4.99 (≈$3.51) in Canada and COP 19,900 (≈$5.97) in Colombia, its cheapest and dearest countries.
- What are the best alternatives to Ohms Law Calc.?
- Southwire® Voltage Drop Calc (4.6 from 1,678 reviews), Southwire® Conduit Fill Calc (4.5 from 765 reviews) and ElectriCalc Pro (4.9 from 648 reviews).
Ohms Law Calc. download
Last updated 1 month ago.
Ohms Law Calc. sells in 175 countries. It was released 14 years and 9 months ago, on 6 Jan 2012. It holds a 4.7 rating from 3,351 reviews.
Supports 9 languages: English, Dutch, French, German, Italian, Polish, Portuguese, Chinese, Spanish.
How much does Ohms Law Calc. make?
Third-party estimates for the last 30 days, worldwide — not the store's own figures, which Apple publishes for nobody.
Revenue by plan
- One-time 100%
Revenue by country
- United States 52%
- United Kingdom 8%
- Australia 6%
- Canada 4%