Power, kVA and Ohm's Law

These calculators relate voltage, current, resistance and power. Solve Ohm’s law, convert between watts, volts, amps, kW and kVA for single and three phase circuits, and find a load’s power factor or the capacitor needed to raise it.

Tools in this group

• kVA Calculator (Amps to kVA) — Convert amps to kVA, or kVA to amps such as a transformer's full-load current, at any voltage.
• kVA into kW Calculator (kVA to kW) — Enter kVA and power factor to get kW and kvar, or convert kW back to kVA.
• kW to Amps Calculator — Enter kilowatts, voltage, phase and power factor to get the current, or convert amps back to kW.
• Ohm's Law Calculator (Ohms Law) — Enter any two of voltage, current, resistance and power; the calculator gives the other two and shows the formula used.
• Power Factor Calculation and Correction — Find the power factor of a load, or the capacitor size needed to raise it to a target value.
• RMS Voltage Calculator (Vpp to Vrms) — Enter one voltage of a waveform and get its RMS, peak, peak-to-peak and average values.
• Three Phase Power Calculator — Enter the line voltage, current and power factor to get three-phase kW, kVA and kvar, or find the current from the power.
• Watts to Volts Conversion Calculator (W to V) — Enter the power and the current or resistance to get the voltage.