Core formulas, phase power, resistance, circuits, and units
kW, kVA and Amp Calculator
Choose kVA to amps, amps to kW, or kW to amps and see only the inputs required for that calculation.
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Electrical Fundamentals & Circuit Analysis
Core formulas, phase power, resistance, circuits, and units
Core formulas, phase power, resistance, circuits, and units
Three Phase Current Calculator
Calculate three-phase current from kW or kVA, line voltage, power factor, and efficiency.
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Power Factor Calculator and Correction
Analyze active, reactive, and apparent power or calculate the capacitor-bank kvar needed to improve power factor.
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RC Circuit and Time Constant Calculator
Calculate RC time constant, cutoff frequency, charging and discharging voltage, capacitive reactance, impedance, gain, and phase at one frequency.
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RLC Impedance and Resonance Calculator
Calculate series or parallel RLC reactance, impedance, admittance, current, phase angle, power factor, resonance frequency, and Q factor.
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Current Divider Calculator
Split a known total current across two to six parallel resistive branches and calculate equivalent resistance, common voltage, branch current, and branch power.
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Capacitor Reactance and Energy Calculator
Calculate capacitive reactance, RMS current, stored energy, charge, peak current screen, and series or parallel equivalent capacitance.
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Inductor Reactance and Energy Calculator
Calculate inductive reactance, RMS current, stored magnetic energy, time constant, and series or parallel equivalent inductance.
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Current Shunt Calculator
Size or verify a DC current shunt from rated current and millivolt drop, including resistance, power loss, burden voltage, and meter scaling.
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Three-Phase Power Calculator
Calculate balanced three-phase active power, apparent power, reactive power, current, phase angle, and power-factor improvement effects.
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Power, Energy & Time Calculator
Enter any two of power, energy, and operating time to calculate the third with automatic electrical-unit conversion.
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Voltage Divider Calculator with Load
Calculate a two-resistor voltage divider, solve for either resistor, or include load resistance to quantify output error and resistor power.
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PCB Conductor Spacing Calculator
Estimate a PCB conductor-spacing reference from voltage and conductor environment, or calculate the maximum reference voltage for an available spacing.
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Ohm's Law Calculator
Enter any two of voltage, current, resistance, and power to calculate the other two electrical quantities.
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Watts to Amps and Volts Calculator
Convert watts, amps, and volts for DC, single-phase, or three-phase systems with common voltage presets.
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Series and Parallel Resistor Calculator
Calculate equivalent resistance, current, and voltage or current division for up to four resistors.
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Electrical Unit Converter
Convert power and energy units in either direction, or calculate DC, single-phase, and three-phase current from power.
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kW to HP Calculator and HP to kW Converter
Convert kilowatts to horsepower or horsepower to kilowatts using mechanical, metric, or electrical horsepower definitions.
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