Comparison

Electrical Formulator vs InstElectric

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Electrical Formulator

This app provides a comprehensive suite of electrical calculation tools for design and engineering challenges. It offers hundreds of conversion and calculation options, with features to save, print, and email results. Easily access frequently used and recently accessed formulas, with all calculations automatically stored.

Highlights
  • Over 100 electrical formulas
  • Save and organize results
  • Share results via email or print
  • Access most-used and recent formulas
  • Supports US/Imperial and metric units
  • Formula categories for batteries, motors, transformers, and more
Features
Read full description

Electrical Formulator: Your Complete Electrical Calculation Tool Solve virtually any electrical design or engineering challenge with this powerful and intuitive electrical formulator. Packed with hundreds of conversion and calculation tools, it’s the most versatile utility in your toolkit. Save, print, or email your results. Easily access your most-used and recently used formulas. Every calculation is automatically saved for future reference. Key Features: • Instant access to over 100 professional-grade electrical formulas • Save and organize your results for later reference • Share results via email or print • Highlights your most-used and recent formulas • Designed for engineers, electricians, and energy professionals Formula Categories: Batteries • Starting motor amperage • Number of cells required • Estimated operating time Cost Calculations • Appliance and lighting energy usage • Estimated usage hours for new bulbs • Insulation payback period BTU Conversions • BTU to joules, horsepower-hr, watt-hr, calories, foot-pounds, and more Generator Calculations • DC generator output • Generator amperage and efficiency Impedance & Reactance • Resistance & reactance combinations • Inductive and capacitive reactance • Total impedance and parallel circuits Kilowatts & Joules • Convert kilowatts to BTU/hr, joules/sec, lumens, horsepower, megajoules/hr, and more Motors • Single- and three-phase motor calculations • Locked rotor current • Motor kVA (including multiple input scenarios) • Motor speed analysis Ohm’s Law • Calculate for power, voltage, resistance, or current Transformers • Primary and secondary amperage • Full-load transformer sizing (208V, 240V, 480V for single and three-phase) • Impedance and amperage capacity calculations Voltage Drop • Copper and aluminum wire voltage drop (1-phase and 3-phase) • US/Imperial and metric units supported Wiring & Conduits • Wire size and resistance (copper and aluminum) • Wire length calculations • Conduit sizing Whether you’re working in the field, the lab, or the classroom, this electrical formulator helps you work faster, smarter, and with confidence. Users are able to calculate twelve formulas for FREE. Purchase a subscription to calculate additional formulas. All subscriptions come with a 1-WEEK FREE TRIAL and SUPPORT Family Sharing.

About

InstElectric

This tool simplifies electrical installation calculations for designers, electricians, and technicians. It supports low-voltage circuit dimensioning, cable sizing, and protection estimations, referencing international standards.

Highlights
  • Low voltage circuit dimensioning
  • Cable sizing and protection
  • Short-circuit current estimation
  • Building load forecasting
  • Capacitor bank calculations
  • Conduit and tray sizing
  • Wire size conversions
Features
Read full description

Tool to support the calculation of electrical installations that will allow the user (designer / electrician / technician) to perform electrical calculations easily and quickly. · Dimensioning complete of low voltage circuits with the most frequent installation methods · Phase cable size, neutral, protective conductor · Criteria based on the admissible current of the cable, voltage drop and overcurrent protection · Designation of the most used cables. · Circuits with automatic circuit breaker until In = 4000 A (Ir rating setting), maximum fuse In = 1600 A (gG type), maximum 12 conductors parallel per phase, maximum size 630 mm² · Estimate of the maximum short-circuit current (simplified method) · Forecast of loads of a building destined to houses with several sections: dwellings, common services, commercial premises/offices and garage with/without infrastructure for recharging electric vehicles · Reactive power of the capacitor bank for the compensation of the power factor (cos φ) and capacity (µF) of the capacitors · C/K Factor for automatic capacitor bank · Choice of installation system in the function of the circuit, cable and its situation · Power in an unbalanced three-phase system · Overvoltages due to loss of neutral conductor, earth fault and short circuit · Electricity parameters of a single-phase or three-phase (balanced) · Transformer performance · Secondary voltage of a transformer acoording to switch position · Size of trays and conduits · Conduits characteristics according to the installation method · Conversions of wire sizes (mm²-awg) and conduits threads · Representation of the curves of the protections · International protection IP - IK Parameter settings for calculations: · Constants (voltages, conductivity, temperatures, etc.) that affect electrical calculations · Protections (circuit breakers and fuses) · Selection of minimum rate for circuit-breakers with regulation and maximum cable size for multi-conductor grouping per phase · Method estimation of the reactance · Conductivity of the conductor depending on the current of the circuit (constant, according to the expected current, maximum cable temperature) · Use reduction factors by grouping cables/circuits · Use of factors of diversity/utilization · Reference documents: IEC Standards, REBT (sp), Technical Application Guide, (UE) 2016/364 IN NO CASE SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT OR INDIRECT DAMAGES AS A RESULT OF THE CORRECT OR INCORRECT USE OF THE APPLICATION

Screenshots

Electrical Formulator4 screens
InstElectric4 screens

Verdict

The call

The clearest difference is rating: Electrical Formulator at 5.0 against InstElectric's 4.3. Electrical Formulator also leads on review sentiment (16% vs 0%). InstElectric's advantage is in-app purchases (none vs 1) and update cadence (monthly vs every 2 months). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Electrical Formulator sells 1 one-off in-app purchase. InstElectric asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Electrical Formulator holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 16% of Electrical Formulator's written reviews are positive against 0% of InstElectric's.

UpkeepUpdate frequency

Electrical Formulator ships an update every 2 months, InstElectric monthly. The most recent releases landed on September 26, 2026 and September 19, 2026 respectively.

Scorecard7 real differences · 3 level
Electrical Formulator versus InstElectric: the parameters behind the verdict, then further details
ParameterElectrical FormulatorInstElectric
PriceFreeFree
Rating5.0 (1 ratings) — better4.3 (3 ratings)
Positive reviews15.6% of reviews — better0.0% of reviews
Number of ratings13 — better
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.48.0 — better
Further details — not scored
Size16 MB19 MB
Age rating4+4+
DeveloperHistorycentral.comAngel Martinez

Customer experience

Electrical Formulator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews32 reviews
Positive15.6%
Neutral9.4%
Negative75.0%

InstElectric

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

1 purchases

Electrical Formulator

One-time1
  • Pro Features For Electrcial$1.99
None

InstElectric

No in-app purchases

Questions

Is Electrical Formulator free?
Electrical Formulator is free to download, with in-app purchases available.
Is InstElectric free?
InstElectric is free to download, with no in-app purchases.
Which has better reviews, Electrical Formulator or InstElectric?
Electrical Formulator is rated higher. Electrical Formulator averages 5.0 out of 5 from 1 ratings, while InstElectric averages 4.3 from 3 ratings.
Do Electrical Formulator or InstElectric have ads?
Neither Electrical Formulator nor InstElectric shows ads.
Which is updated more often, Electrical Formulator or InstElectric?
Electrical Formulator ships an update every 2 months, and InstElectric monthly. Most recently, Electrical Formulator was updated on September 26, 2026 and InstElectric on September 19, 2026.

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