Comparison

Electrical Calculator vs Transformer Calculator Plus

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

Head to head
About

Electrical Calculator

This app provides over 65 essential electrical calculation tools and formulas for engineers, students, and professionals. It supports both USCS and SI units and includes features like resistor color code conversion and upgraded voltage drop calculations aligned with industry standards.

Highlights
  • Over 65 electrical calculation tools
  • Resistor color code calculators
  • Upgraded voltage drop calculations
  • Wire size calculations
  • Series/parallel circuit calculations
  • Energy cost calculator
  • Unit conversions
Features
Read full description

Electrical Calculator is your all-in-one app for fast, accurate, and essential electrical calculations. Packed with 60+ powerful tools, it's designed for electricians, electrical & electronics engineers, and students. Every calculator includes built-in formulas and supports both USCS and SI units. What's New: • Category filters — find any calculator in seconds with purpose-based groups: Ohm's Law, Wiring & NEC, Power & Phase, Motors, Transformers and more • Refreshed design with a cleaner look Core Calculators: • Voltage, Current, Resistance & Power (Ohm's Law) • kVA to Amps / Amps to kVA (Single & Three Phase) Electrical System Calculators: • Voltage Drop Calculator (per NEC/IEEE standards) • Wire Size Calculations (AWG & mm²) • Power, Current & Horsepower (DC, Single & Three Phase) • Efficiency & Power Factor Calculators • Neutral Current (3-Phase Unbalanced Loads) Transformers & Generators: • Transformer Current, Voltage & Resistance Imbalance • DC Generator Reactance & Impedance: • Inductive & Capacitive Reactance • Resonant Frequency • Characteristic Impedance (Parallel & Coaxial) • Impedance Calculators (R-L-C combinations) Series / Parallel Calculations: • Resistance, Inductance & Capacitance (Series & Parallel) • Unknown Resistance & Capacitance (Series & Parallel) Components: • Resistor Color Code — resistance to color bands and back • Inductor & Capacitor Sizing Formulas Lighting & Energy Tools: • Luminous Intensity, Luminous Flux & Solid Angle • Energy Cost Calculator • Energy Stored in Resistors, Inductors & Capacitors Conversions: • Star ↔ Delta Conversion • Field Strength & Electrical Potential • Resistance, Resistivity, Conductance & Conductivity • Capacitance, Inductance & Charge Density Converters • Power Converter Key Features: • Category filters for fast navigation • Flexible unit selection for inputs and outputs • Full iPad support with split view • Dark Mode and 12 languages • Clean interface for the field, the shop, and the classroom

About

Transformer Calculator Plus

This utility app calculates key parameters for transformers, including voltage, current, and turns ratio. It helps determine if a transformer is step-up or step-down, essential for power conversion applications.

Highlights
  • Calculate primary and secondary voltage
  • Calculate primary and secondary current
  • Calculate transformer turns ratio
  • Determine step-up or step-down transformer
  • Supports AC voltage calculations
Features
Read full description

Transformer Calculator calculate any parameter within the transformer equation, including primary and secondary voltage, current, and turns. Transformer Calculations Include: Transformer Turns Ratio – Current and Turns Transformer Turns Ratio – Voltage and Turns Transformer Turns Ratio – Voltage and Current The result will indicate whether the transformer is step-up or step-down. Transformers are primarily used as power converters. The two types—step-up and step-down—operate on the same principle but in opposite directions. A step-up transformer converts a lower AC voltage to a higher voltage, while a step-down transformer reduces a higher AC voltage to a lower level. For example, if a country uses 110 V power, a step-up transformer converts it to 220 V, and a step-down transformer does the reverse. Both work with alternating current (AC). A transformer consists of a soft iron core with two coils wound around it, which are not electrically connected. These coils may be wound on separate limbs of the iron core or placed one over the other. The coil to which the alternating voltage is applied is called the primary coil or primary winding. When an alternating voltage is applied, the resulting alternating current in the primary winding generates a changing magnetic field. This changing field induces an alternating current in the secondary coil. The magnitude of the induced voltage depends on the number of turns in the secondary winding. All transformers have a nameplate rating. It is best to operate them within the voltage limits specified. Using a step-down transformer below its rated limit can support a wide range of applications, but exceeding the specified limit is dangerous and may cause electrical failure. The relationship between voltage, current, and the number of turns in each coil is given by: Vp/Vs = Np/Ns = Is/Ip Where: Vp – Primary voltage Vs – Secondary voltage Np – Primary turns Ns – Secondary turns Ip – Primary current Is – Secondary current Thank you for your support, and please visit nitrio.com for more apps for your iOS devices.

Screenshots

Electrical Calculator4 screens
Transformer Calculator Plus4 screens

Verdict

The call

The clearest difference is review sentiment: Electrical Calculator at 53% against Transformer Calculator Plus's 0%. Electrical Calculator also leads on rating (4.6 vs 3.3) and update cadence (every 4 months vs every 45 months). Transformer Calculator Plus's advantage is price ($2.99 vs $3.99) and iOS requirement (13.0 vs 17.6). On ads, in-app purchases 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

Electrical Calculator costs $3.99 and Transformer Calculator Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Electrical Calculator holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: Electrical Calculator has 462 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 53% of Electrical Calculator's written reviews are positive against 0% of Transformer Calculator Plus's.

UpkeepUpdate frequency

Electrical Calculator ships an update every 4 months, Transformer Calculator Plus every 45 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
Electrical Calculator versus Transformer Calculator Plus: the parameters behind the verdict, then further details
ParameterElectrical CalculatorTransformer Calculator Plus
Price$3.99$2.99 — better
Rating4.6 (462 ratings) — better3.3 (4 ratings)
Positive reviews53.3% of reviews — better0.0% of reviews
Number of ratings462 — better4
Update frequencyEvery 4 months — betterEvery 45 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.613.0 — better
Further details — not scored
Size18 MB1 MB
Age rating4+4+
DeveloperV PUGAZHENTHINitrio

Customer experience

Electrical Calculator

All ratings462 ratings
Positive90.3%
Neutral5.2%
Negative4.5%
Written reviews15 reviews
Positive53.3%
Neutral13.3%
Negative33.3%

Transformer Calculator Plus

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Electrical Calculator

Reported bugs

3 issues
  • Annoying popup for app update
  • Converter not working
  • App not working on older iPhone models

Requested features

2 requests
  • Include impedance calculators
  • Improve metric region compatibility for AWG cables

Transformer Calculator Plus

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Electrical Calculator

No in-app purchases

None

Transformer Calculator Plus

No in-app purchases

Questions

Is Electrical Calculator free?
Electrical Calculator costs $3.99, with no in-app purchases.
Is Transformer Calculator Plus free?
Transformer Calculator Plus costs $2.99, with no in-app purchases.
Which has better reviews, Electrical Calculator or Transformer Calculator Plus?
Electrical Calculator is rated higher. Electrical Calculator averages 4.6 out of 5 from 462 ratings, while Transformer Calculator Plus averages 3.3 from 4 ratings.
Do Electrical Calculator or Transformer Calculator Plus have ads?
Neither Electrical Calculator nor Transformer Calculator Plus shows ads.
Which is updated more often, Electrical Calculator or Transformer Calculator Plus?
Electrical Calculator ships an update every 4 months, and Transformer Calculator Plus every 45 months. Most recently, Electrical Calculator was updated on October 23, 2026 and Transformer Calculator Plus on October 24, 2026.

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