25+ free calculators· 5 tools · 4 categories

All Electrical Calculators

Fast, accurate browser-based calculators for wire sizing, voltage drop, cable calculations, and engineering math. No install, no signup.

Wiring & Cross-section

1 calculator in this group

AWG to mm² Converter

Convert American Wire Gauge (AWG) to mm² cross-section and mm² back to AWG instantly, with diameter, resistance per km and standard IEC / NEC reference sizes.

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Power System Analysis

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Voltage Drop Calculator (IEC 60364 & NEC NFPA 70)

Voltage drop calculator with a single page covering BOTH IEC 60364-5-52 Annex G (metric mm² cables, A/B limits) and NEC NFPA 70 Chapter 9 Tables 8–9 (AWG / kcmil, 3% branch / 5% feeder FPNs). Copper / aluminium, 1-phase / 3-phase / DC, temperature correction, parallel conductors, conduit material (NEC), reactance X and ampacity cross-check.

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Symmetrical Components Calculator

Compute positive, negative and zero sequence components from three-phase currents or voltages (balanced or unbalanced), then reconstruct phase phasors back.

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Engineering Math

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Complex Number Calculator

Add, subtract, multiply and divide complex numbers in rectangular and polar forms, with phasor angle in degrees, ideal for power systems and AC circuits.

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Cable Installation

1 calculator in this group

Cable Sizing Calculator

Estimate the minimum cable cross-section for LV installations using load current, installation method, number of circuits, ambient temperature and voltage drop constraints.

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