Ohms Law Calc.

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.