Voltage Drop Calculator. vs Building Wire Selector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Voltage Drop Calculator.
Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.
- NEC and IEC dual standards
- Voltage drop and wire sizing calculations
- Support for continuous load and corrections
- Copper or Aluminum conductor options
- Single-phase and three-phase systems
- Automatic compliance checks
- PDF report generation
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Perform accurate Voltage Drop and Wire Sizing calculations for both NEC® (National Electrical Code) and IEC standards. Built for electricians, engineers, and contractors who need reliable results on the go. Voltage Drop Calculator • Dual standards: Switch between NEC (AWG/Imperial) and IEC (mm²/Metric) • Enter voltage, current, run length, and power factor • Supports continuous load (125%), grouping, and ambient temperature corrections • Copper or Aluminum conductors for single-phase and three-phase systems • Detailed results including ampacity, derating, voltage drop, and load voltage • Automatic compliance checks (e.g., ≤ 3% for branch circuits) Wire Size Calculator (Reverse) • Calculates required wire size for a target voltage drop % • Suggests optimal AWG, kcmil, or mm² • Uses NEC Chapter 9, Table 9 (AC impedance) with DC fallback Professional Tools • Wire converter (AWG/kcmil ↔ mm²) • Generate and share PDF reports • Handy electrical formula cards • Localized in English, Spanish, French, German, Italian, Dutch, Portuguese, and Chinese
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 review sentiment: Building Wire Selector at 100% against Voltage Drop Calculator.'s 33%. Building Wire Selector also leads on in-app purchases (none vs 1) and ads (none vs shown). Voltage Drop Calculator.'s advantage is ratings volume (414 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. Voltage Drop 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 4.6. That said, the two scores are not equally well evidenced: Voltage Drop Calculator. has 414 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of Voltage Drop Calculator.'s written reviews are positive against 100% of Building Wire Selector's.
Voltage Drop Calculator. ships an update every 3 months, Building Wire Selector every 2 months. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.
| Parameter | Voltage Drop Calculator. | Building Wire Selector |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (414 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 33.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 414 — better | 2 |
| Update frequency | Every 3 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 | 51 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | Southwire Company |
Customer experience
Voltage Drop Calculator.
Building Wire Selector
In-app purchases
Voltage Drop Calculator.
- Go Pro$4.99
Building Wire Selector
No in-app purchases
Questions
Is Voltage Drop Calculator. free?
Is Building Wire Selector free?
Which has better reviews, Voltage Drop Calculator. or Building Wire Selector?
Do Voltage Drop Calculator. or Building Wire Selector have ads?
Which is updated more often, Voltage Drop Calculator. or Building Wire Selector?
Other comparisons
