Free tools
Electrical calculators
Free calculators for your design and troubleshooting work: cable sizing, motor current, voltage drop, power factor correction. Simple, instant and no sign-up.
Enter your values, the result is computed instantly. Free, no sign-up.
Ohm’s law & power
Voltage, current, resistance and power.
Free toolsThree-phase motor current
Motor current from its power rating.
Free toolsCable size
Minimum section from the voltage drop.
Free toolsVoltage drop
Line voltage drop in volts and %.
Free toolskW ↔ HP conversion
Power in kilowatts and horsepower.
Free toolsPower factor correction
Capacitor power (kVAR) to install.
Free tools