Voltage Drop Calculator. vs TB Logic

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

Tool Belt Logic is the jobsite calculator built for framers, concrete crews, and GCs - fast, simple, and made for dirty gloves. Free to use: - Construction calculator with feet-inch-fraction math - Tap-to-reuse running tape so you never lose a number Tool Belt Logic Pro unlocks: - Smart formulas: Rake Wall, Arch Wall, Stair Layout, Hip/Valley, Circle, Concrete Volume, and more - each with a clear cut list and a to-scale diagram - AI Chat that answers jobsite math in plain language - Learning Mode field tips - Save and share your work - English and Spanish No clutter, no fluff - just the numbers you need to build it right the first time.