Ohms Law Calc. vs Mike Holt's Electrical Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ohms Law Calc.
This app provides a comprehensive suite of electrical calculations, including Ohm's Law, voltage drop, wire sizing, and impedance. It also offers numerous converters for various electrical units and parameters, aiding in circuit design and analysis.
- Ohm's Law calculations
- Voltage drop calculator
- Wire size calculator
- Impedance calculations (R, L, C)
- Electrical unit converters
- Power and current conversions
- Circuit design tools
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Ohm's Law Calc. consists of 60 Electrical Calculators with Formulas and Circuits and 16 Electrical Converters. • Voltage Calculator • Current Calculator • Resistance Calculator • Power Calculator • Voltage Drop Calculator • Wire Size Calculator • DC Generator Calculator • Transformer Calculations (Voltage & Current) Impedance Calculators Calculate impedance for combinations of resistors (R), inductors (L), and capacitors (C) in both series and parallel configurations: • R and L in Series / Parallel • R and C in Series / Parallel • L and C in Series / Parallel • R, L and C in Series / Parallel Power and Current Conversions • kVA to Amps (Single Phase & Three Phase) • Amps to kVA (Single Phase & Three Phase) • Single Phase & Three Phase Power Calculators • Horsepower Calculators (DC, Single Phase, Three Phase) Efficiency and Power Factor Tools • Efficiency Calculators (DC, Single Phase, Three Phase) • Power Factor Calculators (Single Phase & Three Phase) Energy Storage Calculators • Energy Cost Calculator • Energy Storage Calculators (Resistance, Inductance, Capacitance) Circuit Design Tools • Star-to-Delta and Delta-to-Star Conversions • Inductive & Capacitive Reactance Calculators • Resonant Frequency Calculator • Inductor and Capacitor Sizing Equations Component Calculations • Series and Parallel Calculators for Resistance, Inductance, and Capacitance • Unknown Resistance and Capacitance Calculators (Series & Parallel) More Calculations • Neutral Current (3-Phase Unbalanced Loads) • Characteristic Impedance (Parallel & Coaxial) • Transformer Calculator • Voltage Divider Calculator Illumination Calculators • Luminous Intensity Calculator • Luminous Flux Calculator • Solid Angle Calculator Electrical Converters • Field Strength Converter • Electrical Potential Converter • Resistance and Resistivity Converters • Conductance and Conductivity Converters • Capacitance and Inductance Converters • Charge Converters: Handles conversions for electrical charge, including: • Linear Charge Density • Surface Charge Density • Volume Charge Density • Linear Current Density • Surface Current Density • Power Converter App works with both iPhones, iPads and Mac Multiple Unit Compatibility: Supports a wide range of units for all electrical parameters, including Ohms, kiloOhms, Farads, Henrys, kVA, Volts, Weber, and more.
Mike Holt's Electrical Toolbox
This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.
- Conductor sizing
- Voltage drop limitations
- Circuit protection sizing
- Race sizing
- Equipment grounding conductor sizing
- Dwelling-unit service calculations
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Mike Holt, the industry leader in the electrical industry (MikeHolt.com) has created an amazing, practical and useful app for the electrician, inspector, instructor, contractor and engineer. The app contains conductor sizing (including voltage drop limitations), circuit protection sizing, race sizing, equipment grounding conductor sizing for electric heating equipment (commercial and Residential), air-conditioning equipment (commercial and Residential), motors (commercial and Residential), Transformers (commercial) , and dwelling-unit service calculations and sizing.
Screenshots
Verdict
The clearest difference is in-app purchases: Mike Holt's Electrical Toolbox at none against Ohms Law Calc.'s 1. Mike Holt's Electrical Toolbox also leads on ads (none vs shown) and review sentiment (77% vs 50%). Ohms Law Calc.'s advantage is ratings volume (1.3K vs 197). On price, rating, update cadence and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Ohms Law Calc. sells 1 one-off in-app purchase. Mike Holt's Electrical Toolbox asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Ohms Law Calc. against 4.6 for Mike Holt's Electrical Toolbox. That said, the two scores are not equally well evidenced: Ohms Law Calc. has 1.3K ratings behind it against 197, so its average is the more settled of the two. Written reviews are what separate them: 50% of Ohms Law Calc.'s written reviews are positive against 77% of Mike Holt's Electrical Toolbox's.
Ohms Law Calc. ships an update every 2 months, Mike Holt's Electrical Toolbox every 3 months. The most recent releases landed on September 8, 2026 and September 21, 2026 respectively.
| Parameter | Ohms Law Calc. | Mike Holt's Electrical Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.3K ratings) — better | 4.6 (197 ratings) |
| Positive reviews | 50.0% of reviews | 76.7% of reviews — better |
| Number of ratings | 1.3K — better | 197 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 59 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | Mike Holt Enterprises |
Customer experience
Ohms Law Calc.
Mike Holt's Electrical Toolbox
User reviews
Ohms Law Calc.
From 1.3K App Store ratingsWhat we love
- 🚀 Great value
- 🚀 Works perfectly
- 🚀 Fantastic app
- 👍 Best thing since sliced bread
- 🚀 Useful for electrical work
Room to improve
- 👎 Have to pay again for an app already purchased
- 👎 Not easy to use
- 🐛 Paid but not unlocked, no response from developer
- 👎 Annoying pop-ups
- 🐛 Keeps shutting down
Mike Holt's Electrical Toolbox
From 197 App Store ratingsWhat we love
- 👍 Great app for electricians
- 💡 Provides code article references
- 👍 Useful for on-the-spot reference
- 👍 Excellent for verifying calculations
- 👍 Helpful for exam preparation
Room to improve
- 🐛 Emailing results not working
- 🐛 Outdated information
- 🐛 Load calc a little clunky
- 🐛 Content setup needs overhaul
- 🐛 Video series lacks completion system
Bugs and requests
Ohms Law Calc.
Reported bugs
3 issues- Paid version not unlocking
- Repeatedly prompting for payment after already paid
- Keyboard overlaying results making it difficult to see
Requested features
3 requests- Add more electrical conversions and calculations
- Add ability to input voltage and resistance to get amps and watts
- Add kVA, rms, and other popular needed conversions
Mike Holt's Electrical Toolbox
Reported bugs
4 issues- Cannot email results
- Video player widescreen exit bug
- Previous calculation data not erased
- App content is outdated
Requested features
6 requests- Increase transformer capacity to 225kva
- Add option to print load calc
- Update to NEC 2020
- Add completion system for video series
- Refine user interface for better usability
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- Add more features, willing to pay extra
In-app purchases
Ohms Law Calc.
- Ohms Law Calc.$3.99
Mike Holt's Electrical Toolbox
No in-app purchases
Questions
Is Ohms Law Calc. free?
Is Mike Holt's Electrical Toolbox free?
Which has better reviews, Ohms Law Calc. or Mike Holt's Electrical Toolbox?
Do Ohms Law Calc. or Mike Holt's Electrical Toolbox have ads?
Which is updated more often, Ohms Law Calc. or Mike Holt's Electrical Toolbox?
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