Electrical & Electronics
Voltage, current, power, and resistor calculators.
38 toolsBattery Life Calculator
Calculate battery runtime from capacity and load current. Free, instant.
calculatorCable Ampacity Derating Calculator
Derate cable ampacity for temperature and bundling. Free, instant.
calculatorCable Tray Fill Calculator
Calculate cable tray fill percentage. Free, instant.
calculatorCapacitor Energy Calculator
Capacitor Energy Calculator. Free, instant, no signup.
calculatorCapacitor Energy Calculator
Capacitor Energy Calculator. Free, instant calculator.
calculatorConduit Fill Calculator
Calculate conduit fill percentage based on wire count and size. Free, instant.
calculatorConduit Fill Calculator
Conduit Fill Calculator.
calculatorElectrical Load Calculator
Estimate total electrical demand load for panel sizing. Free, instant.
calculatorElectricity Cost Calculator
Electricity Cost Calculator. Free, instant, no signup.
calculatorGenerator Sizing Calculator
Estimate generator size needed. Free, instant.
calculatorInductor Energy Calculator
Calculate energy stored in an inductor. E = ½LI². Free, instant.
calculatorInductor Energy Calculator
Inductor Energy Calculator. Free, instant calculator.
calculatorLED Resistor Calculator
LED Resistor Calculator.
calculatorLED Resistor Calculator
LED Resistor Calculator. Free, instant, no signup.
calculatorLux to Lumens Calculator
Convert between lux (illuminance) and lumens. Free, instant.
calculatorMotor Full Load Amps Calculator
Estimate motor full load amps from HP and voltage. Free, instant.
calculatorMotor Starting Current Calculator
Motor Starting Current Calculator. Free, instant, no signup.
calculatorOhm's Law Calculator
Calculate voltage, current, or resistance using Ohm's Law. Free, instant.
calculatorParallel Capacitance Calculator
Parallel Capacitance Calculator. Free, instant, no signup.
calculatorParallel Resistance Calculator
Parallel Resistance Calculator. Free, instant, no signup.
calculatorElectrical Power Calculator
Electrical Power Calculator. Free, instant, no signup.
calculatorPower Factor Calculator
Calculate power factor from real and apparent power. Free, instant.
calculatorRC Time Constant Calculator
Calculate RC circuit time constant τ = R × C. Free, instant.
calculatorResistor Value (4-Band)
Resistor Value (4-Band). Free, instant, no signup.
calculatorResonant Frequency Calculator
Resonant Frequency Calculator. Free, instant, no signup.
calculatorRL Time Constant
RL Time Constant.
calculatorSeries Capacitance Calculator
Series Capacitance Calculator. Free, instant, no signup.
calculatorShort Circuit Current Calculator
Estimate short circuit current from transformer data. Free, instant.
calculatorSingle Phase Power Calculator
Calculate single-phase electrical power. P = V × I × PF. Free, instant.
calculatorThree Phase Power Calculator
Calculate three-phase power. P = √3 × V × I × PF. Free, instant.
calculatorTransformer Turns Ratio Calculator
Calculate transformer turns ratio, voltage, or current ratios. Free, instant.
calculatorTransformer Turns Calculator
Transformer Turns Calculator.
calculatorVoltage Drop Calculator
Voltage Drop Calculator. Free, instant, no signup.
calculatorVoltage Drop Calculator
Calculate voltage drop in copper wire.
calculatorWatts to Amps
Watts to Amps. Free, instant, no signup.
calculatorWire Gauge Ampacity Lookup
Estimate ampacity for copper wire gauge.
calculatorWire Gauge Calculator
Wire Gauge Calculator. Free, instant, no signup.
calculatorWire Resistance Calculator
Wire Resistance Calculator. Free, instant calculator.
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