Ohms Law Calc.

About this app

The electrician's pocket toolkit — 60 electrical calculators and 16 converters with formulas and circuit diagrams for every calculation. Size wire, check voltage drop per NEC, convert kVA to amps, and solve Ohm's Law in seconds. No subscription. One small purchase unlocks everything, forever, on iPhone, iPad and Mac. WHY ELECTRICIANS AND STUDENTS LOVE IT • Every calculator shows the formula and circuit diagram — learn while you work • Organized by category: Ohm's Law, Wiring & NEC, Power & Phase, Motors & HP, Transformers, Reactance, Components, Energy & Light • SI and US customary units side by side • Available in 12 languages WIRING & CODE • Voltage Drop Calculator (NEC/IEEE) • Wire Size Selector (AWG & metric) OHM'S LAW & POWER • Voltage, Current, Resistance & Power Calculators • Single & Three Phase Power, Current and Power Factor • kVA ⇄ Amps (Single & Three Phase) • Neutral Current (3-Phase Unbalanced Loads) MOTORS, GENERATORS & TRANSFORMERS • Horsepower Calculators (DC, Single Phase, Three Phase) • Efficiency Calculators (DC, Single & Three Phase) • DC Generator, Transformer Voltage & Current • Star ⇄ Delta Conversions IMPEDANCE & REACTANCE • Impedance for R, L, C in any series/parallel combination • Inductive & Capacitive Reactance, Resonant Frequency • Characteristic Impedance (Parallel & Coaxial lines) COMPONENTS & ENERGY • Resistor Color Code • Series/Parallel Resistance, Inductance & Capacitance • Unknown Resistance & Capacitance (Series/Parallel) • Inductor & Capacitor Sizing, Voltage Divider • Energy Cost & Energy Storage Calculators ILLUMINATION • Luminous Intensity, Luminous Flux & Solid Angle 16 ELECTRICAL CONVERTERS Field strength, potential, resistance & resistivity, conductance & conductivity, capacitance, inductance, charge & current densities (linear, surface, volume), power — with Ohms, kΩ, Farads, Henrys, kVA, Volts, Weber and more. Download free and try the core calculators today.

• Find calculators faster — new category chips group all 60+ calculators by purpose • Bug fixes and improvements

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1. First observed Aug 10, 2026 · 3:33 PM Free