AmpMetric: Cable Calculator

DaVinci Labs

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About this app

AmpMetric is the professional, offline-first electrical calculation utility engineered specifically for electricians, electrical contractors, trade apprentices, and site inspectors.

Say goodbye to flipping through bulky codebooks on ladders or making manual calculation errors. AmpMetric auto-detects your country and provides instant, reactive wire sizing, thermal ampacity derating, voltage drop validation, and raceway fill verification directly on the job site—even in shielded basements with zero cell reception.

MULTI-STANDARD STATUTORY COMPLIANCE:
• 🇺🇸 United States — NFPA 70 / NEC 2023 & 2026:
Table 310.16 (75°C THHN/THWN-2 ampacity), Table 310.15(B)(1) temperature correction, Table 310.15(C)(1) multi-conductor bundling adjustment, Chapter 9 Table 4 EMT conduit fill, and automatic 3-conductor physical jam ratio warnings (2.8 ≤ ID/OD ≤ 3.2).
• 🇬🇧 United Kingdom — IET Wiring Regulations BS 7671:2018+A2:2022:
Tables 4D1A/4D5 (Methods A, B, C), Table 4B1 (Ca), Table 4C1 (Cg), tabulated (mV/A/m) voltage drop, and Chapter 41 Table 41.3 maximum permitted earth fault loop impedance (Zs) for Type B, C, and D circuit breakers (0.4s disconnection).
• 🇮🇹 Italy — Norma CEI 64-8 (8ª Edizione):
CEI UNEL 35024/1 CPR cables (FS17, FG16OR16), K1 temperature correction, K2 grouping factors, Art. 525 4.0% voltage drop limit, Art. 433.1 breaker-cable coordination (Ib ≤ In ≤ Iz), and CEI EN 61386 corrugated conduit sizing (≤ 50% fill).
• 🇩🇪 Germany — DIN VDE 0100 & DIN VDE 0298-4:
NYM-J / NYY-J cable sizing, Verlegeart B2 & E, Table 17 temperature derating, Table 21 grouping, and DIN 18015-1 voltage drop (≤ 3.0%).
• 🇦🇺 Australia & New Zealand — AS/NZS 3000:2018 & AS/NZS 3008.1.1:
V-90 thermoplastic cable sizing, Table 4 enclosed/unenclosed ratings, Table 27(1) ambient derating, 5.0% voltage drop limit, and Table B4 Max Zs loop impedance verification.
• 🇨🇦 Canada — CSA C22.1 (Canadian Electrical Code / CEC 2024):
Table 2 (75°C copper ampacities), Table 5A & 5C deratings, Rule 8-102 (3% branch drop), and Rule 14-104 breaker protection limits.
• 🇫🇷 France — NF C 15-100:
Tableau 52C (Câbles U-1000 R2V / H07V-U), Méthodes B & C, facteurs K1/K2, chute de tension 3%/5%, et règle du tiers gaine ICTA.

KEY CAPABILITIES:
✓ Auto-Detection: Automatically loads your country’s standard from device settings while allowing 1-tap switching.
✓ Job-Site Presets: Fast 1-tap presets for 20A Branch Outlets, 32A/40A EV Chargers, Heat Pumps, and 100A Sub-Panels.
✓ Reactive Sliders: Adjust load amperage, run length, ambient temperature, and bundled cables with instant visual updates.
✓ Dynamic Voltage Drop Gauge: Color-coded progress bar verifying exact statutory compliance in real time.
✓ 1-Tap Vector PDF Reports: Generate professional, inspector-ready compliance certificates citing official code articles with contractor signature blocks.
✓ 100% Offline & Private: No cloud servers, no account logins, and zero collection of your personal data.

MONETIZATION & PRO UPGRADE:
• Free Version: Core single-circuit calculation and voltage drop checking supported by minimal, non-intrusive trade banners.
• AmpMetric Pro ($14.99/yr or $34.99 Lifetime):
- 100% Ad-Free experience with zero interruptions.
- Unlimited vector PDF compliance certificates.
- Advanced environmental bundling derating factors.
- Conduit sizing, raceway fill, and jam ratio hazard warnings.
- Full earth fault loop impedance (Zs) checks.