Transformer Calculator. vs Building Wire Selector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Transformer Calculator.
This app simplifies transformer calculations for engineers and students. It accurately computes primary and secondary currents, turns ratios, and secondary voltages based on user inputs for transformer ratings and winding turns.
- Primary and secondary current calculations
- Turns ratio determination
- Transformer type identification
- Secondary voltage calculation
- Supports 1Φ and 3Φ phases
- User-friendly interface
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Transformer Calculator: A user-friendly app for Current and Voltage Calculations. Current Calculations • Calculate primary and secondary full-load currents. • Determine the turns ratio and transformer type. How it works: 1. Select the phase type (1Φ or 3Φ). 2. Input transformer ratings (VA/kVA) and primary/secondary voltages. Outputs: • Primary full-load current • Secondary full-load current • Turns Ratio: N1 / N2 = V1 / V2 = I2/ I1 Voltage Calculations How it works: 1. Enter Number of turns in the primary and secondary windings 2. Input Primary voltage Outputs: • Secondary voltage • Turns Ratio: N1 / N2 = V1 / V2 = I2/ I1 Effortless and Accurate: Perfect for engineers and students to compute transformer parameters precisely.
Building Wire Selector
This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.
- Conductor size determination
- Wire and cable type selection
- National Electrical Code compliance
- Electrical installation guidance
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Southwire's Building Wire Selector determines the minimum conductor size and the best wire and cable type for a particular installation, following the National Electrical Code® wiring methods.
Screenshots
Verdict
The clearest difference is in-app purchases: Building Wire Selector at none against Transformer Calculator.'s 1. Building Wire Selector also leads on ads (none vs shown) and rating (5.0 vs 4.8). Transformer Calculator.'s advantage is ratings volume (49 vs 2). On price, update cadence, device support and iOS requirement 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. Transformer Calculator. sells 1 one-off in-app purchase. Building Wire Selector asks for nothing beyond the download.
Building Wire Selector holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Transformer Calculator. has 49 ratings behind it against 2, so its average is the more settled of the two.
Transformer Calculator. ships an update every 4 months, Building Wire Selector every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | Transformer Calculator. | Building Wire Selector |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (49 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 49 — better | 2 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.6 — better |
| Further details — not scored | ||
| Size | 41 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | Southwire Company |
Customer experience
Transformer Calculator.
Building Wire Selector
In-app purchases
Transformer Calculator.
- Go Pro$3.99
Building Wire Selector
No in-app purchases
Questions
Is Transformer Calculator. free?
Is Building Wire Selector free?
Which has better reviews, Transformer Calculator. or Building Wire Selector?
Do Transformer Calculator. or Building Wire Selector have ads?
Which is updated more often, Transformer Calculator. or Building Wire Selector?
Other comparisons
