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OHMs Law Calc

OHMs Law Calc

by Jonathan Mellen

0 ratings
8 reviews
#198 in paid Reference
📊 Productivity
🔍 Reference
$1.99

Details

  • Released
  • Updated
  • January 31, 2012
  • June 7, 2026

Features

Developer

Jonathan Mellen
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About

This tool calculates Ohm's Law for single and three-phase applications using vector calculations for balanced and unbalanced loads. It quickly determines Watts, Volts, Amps, or Ohms, and can back-calculate load resistance. Widget support is included.

✓Single and three-phase calculations
✓Vector calculations for unbalanced loads
✓Calculate Watts, Volts, Amps, or Ohms
✓Back-calculate load resistance
✓Widget support
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What's New in OHMs Law Calc

3.3.3

June 7, 2026

APPLE WATCH SUPPORT! Plus three phase total watt entry with back calculation added

Charts

Top Paid

📉 198-4

Reference

This app dropped -4 positions in Reference chart.

Last updated on July 22, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Quick and Easy!

This app really does calculate Three Phase correctly... Not just using the old "lazy engineers" trick of multiplying by 1.732... But rather doing the actual VECTOR MATH to properly calculate BOTH balanced and unbalanced loads. Works great for resistive AC circuits too!
The app does exactly what it says, makes single and three phase calculations a breeze. I'll never get the wrong Three Phase Breaker again!
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TalobabTalobab

Incorrectly calculates for AC

Good attempt, but this calculator works 100% correctly ONLY for DC.

For AC, it ignores Power Factor (PF), caused by ever present out-of-phase Reactive currents. All AC "Power" results are really in "Volt-Amps" (VA) not Watts.

For 3-Ph AC it incorrectly calculates VA, when given Voltage & Current. The correct method is: V x A x 1.73 (Sq Root of 3) = VA
Power in Watts is then:
VA x PF = Watts

PF is always a number between 0 & 1, with 1 being in-phase (purely resistive) current, and 0 being 90 deg out-of-phase (purely reactive) current.

For calculations (where actual PF is unknown) a PF of 0.8 is typically used.

Resistance alone in never the only factor in AC Circuits.
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DAVEOFFUTTDAVEOFFUTT

Sparky

A lot of better free apps out there!
Waste of money! Wish I can take my
Money back.
Nickname taken(v1.1)Nickname taken(v1.1)

Best ohms law app I have ever used!

This is the best ohms law app I have in my electronics folder! I really like this app! Good job!A+
MsweanyMsweany

awesome

works just like described, it does 3phase and single phase. It's also iphone and ipad compatible. 5 start app all the way
Hosboss2002Hosboss2002
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FAQ

What is OHMs Law Calc?

OHMs Law Calc is a paid application that calculates Ohm's Law for single and three-phase electrical applications. It uses vector calculations for both balanced and unbalanced loads, allowing users to quickly determine Watts, Volts, Amps, or Ohms.

Does OHMs Law Calc have ads?

No, OHMs Law Calc does not contain advertisements. It is a paid application available for $1.99.

What devices is OHMs Law Calc compatible with?

OHMs Law Calc is compatible with iPhone, iPad, and iPod devices. It is suitable for users aged 4 and above.

How often is OHMs Law Calc updated?

The latest version of OHMs Law Calc, version 2.1, was last updated on October 24, 2023. Updates are released periodically to improve functionality and address any issues.

What is the user rating for OHMs Law Calc?

OHMs Law Calc has a user rating of 3.7 stars based on 3 ratings. This indicates a generally positive reception from its user base.

Can OHMs Law Calc calculate unbalanced three-phase loads?

Yes, OHMs Law Calc specifically uses proper vector calculations to accurately compute both balanced and unbalanced three-phase loads. This feature is crucial for complex electrical system analysis.

Does OHMs Law Calc offer a free trial?

OHMs Law Calc is a paid application and does not offer a free trial. It is available for a one-time purchase price of $1.99.

What electrical parameters can OHMs Law Calc calculate?

OHMs Law Calc can easily and quickly calculate Watts, Volts, Amps, or Ohms. It also allows users to back-calculate the Load resistance from voltage and Phase Amps.