Electrical Calculators — Amps, Watts, Volts & Power Conversions
Free electrical conversion calculators for US standard circuits. Convert between amps, watts, volts, kilovolt-amps (kVA), and kilowatt-hours (kWh). Every calculator supports DC, single-phase AC, and three-phase AC circuits with power factor adjustment.
All Electrical Calculators
Amps to Watts Calculator
Convert amps to watts for DC and AC circuits. Enter current (amps) and voltage to calculate power in watts using Watt's Law. Supports single-phase and three-phase AC.
★★★★★Watts to Amps Calculator
Convert watts to amps for DC and AC circuits. Enter power (watts) and voltage to calculate current in amps. Supports single-phase and three-phase AC with power factor.
★★★★★Volts to Watts Calculator
Convert volts to watts using current or resistance. Learn the formulas for DC and AC circuits with power factor. Includes voltage-to-wattage conversion table.
★★★★★Watts to Volts Calculator
Convert watts to volts for DC and AC circuits. Enter power (watts) and current (amps) to find voltage. Supports power factor for AC circuit calculations.
★★★★☆Amps to Volts Calculator
Convert amps to volts using Ohm's Law (with resistance) or Watt's Law (with power). Supports DC, single-phase AC, and three-phase AC circuits.
★★★★☆Volts to Amps Calculator
Convert volts to amps using Ohm's Law (with resistance) or Watt's Law (with power). Calculate current draw for any DC or AC electrical circuit.
★★★★☆kVA to Amps Calculator
Convert kilovolt-amps (kVA) to amps for single-phase and three-phase AC circuits. Essential for generator sizing and transformer calculations.
★★★★★Amps to kVA Calculator
Convert amps to kilovolt-amps (kVA) for single-phase and three-phase circuits. Calculate apparent power for generator and transformer sizing.
★★★★☆Watts to kWh Calculator
Convert watts to kilowatt-hours (kWh) to calculate energy consumption and electricity costs. See how much power your appliances use per day, month, or year.
★★★★★kWh to Watts Calculator
Convert kilowatt-hours (kWh) to watts to find the power consumption of any device. Calculate how many watts your appliances draw from your energy bill.
★★★★☆kW to Amps Calculator
Convert kilowatts (kW) to amps for DC, single-phase and three-phase circuits: divide kW × 1,000 by voltage (and by power factor and √3 for AC).
★★★★★kW to kVA Calculator
Convert kilowatts (kW) to kilovolt-amps (kVA) by dividing by the power factor: kVA = kW ÷ PF. Size generators, transformers and UPS systems correctly.
★★★★★kW to kWh Calculator
Convert kilowatts (kW) to kilowatt-hours (kWh) by multiplying by hours of use: kWh = kW × h. Estimate energy use and electricity cost for any appliance.
★★★★★kW to VA Calculator
Convert kilowatts (kW) to volt-amps (VA) using power factor: VA = kW × 1,000 ÷ PF. Size a UPS, inverter or transformer for a known real-power load.
★★★★☆kWh to kW Calculator
Convert kilowatt-hours (kWh) to kilowatts (kW) by dividing by time in hours: kW = kWh ÷ h. Find the average power behind an energy figure.
★★★★☆kVA to HP Calculator
Convert kVA to horsepower: HP = kVA × PF × Eff ÷ 0.746. Find the motor output a given apparent power supply can support.
★★★★☆kVA to kW Calculator
Convert kilovolt-amps (kVA) to kilowatts (kW) by multiplying by the power factor: kW = kVA × PF. Generators are usually rated at PF 0.8.
★★★★★kVA to VA Calculator
Convert kilovolt-amps (kVA) to volt-amps (VA) by multiplying by 1,000. Useful for comparing UPS, inverter and transformer ratings listed in different units.
★★★☆☆kVA to Watts Calculator
Convert kilovolt-amps (kVA) to watts using power factor: W = kVA × PF × 1,000. Find how many watts a generator, UPS or transformer can supply.
★★★★☆Ah to kWh Calculator
Convert amp-hours (Ah) to kilowatt-hours (kWh): kWh = Ah × V ÷ 1,000. See how much energy a battery bank stores and how long it can power your home.
★★★★★Ah to Wh Calculator
Convert amp-hours (Ah) to watt-hours (Wh) by multiplying by the battery voltage: Wh = Ah × V. Find out how much energy a battery really stores.
★★★★☆Wh to Ah Calculator
Convert watt-hours (Wh) to amp-hours (Ah) by dividing by the battery voltage: Ah = Wh ÷ V. Compare batteries of different voltages or size a battery bank.
★★★★☆Wh to mAh Calculator
Convert watt-hours (Wh) to milliamp-hours (mAh): mAh = Wh ÷ V × 1,000. Turn laptop, drone and power bank Wh ratings into mAh at the cell voltage.
★★★★☆mAh to Wh Calculator
Convert milliamp-hours (mAh) to watt-hours (Wh): Wh = mAh × V ÷ 1,000. Check power bank capacity for airline limits and compare phone and laptop batteries.
★★★★☆kWh to Ah Calculator
Convert kilowatt-hours (kWh) to amp-hours (Ah) using battery voltage: Ah = kWh × 1,000 ÷ V. Plan solar storage, home batteries and EV packs.
★★★★☆Amps to VA Calculator
Convert amps to volt-amps (VA) for single-phase and three-phase circuits. Multiply current by voltage, and by √3 for three-phase.
★★★★☆VA to Amps Calculator
Convert volt-amps (VA) to amps for single-phase and three-phase circuits. Divide VA by the voltage, or by voltage × √3 for three-phase.
★★★★☆VA to kVA Calculator
Convert volt-amps (VA) to kilovolt-amps (kVA) by dividing by 1,000. Used to read UPS, inverter and transformer ratings, which are given in apparent power.
★★★☆☆VA to kW Calculator
Convert volt-amps (VA) to kilowatts (kW) using power factor: kW = VA × PF ÷ 1,000. Find the real power a UPS, inverter or generator can deliver.
★★★★☆Amps to HP Calculator
Convert amps to horsepower (HP) for DC, single-phase and three-phase motors, using voltage, power factor and motor efficiency.
★★★★☆HP to Amps Calculator
Convert horsepower to amps for DC, single-phase and three-phase motors. Estimate motor current for wiring and breaker sizing.
★★★★★HP to kVA Calculator
Convert horsepower to kVA for motor, generator and transformer sizing: kVA = HP × 746 ÷ (PF × Eff × 1,000). Includes power factor and motor efficiency.
★★★★☆Volts to Joules Calculator
Convert volts to joules using electric charge: E = V × Q. Calculate the energy transferred when a charge in coulombs moves through a voltage.
★★★★☆Watts to Joules Calculator
Convert watts to joules by multiplying power by time in seconds: E = P × t. Find the energy used by a device, and convert it to Wh, kWh or kcal.
★★★★☆Joules to Volts Calculator
Convert joules to volts using charge: V = E ÷ Q. Find the voltage when you know the energy transferred and the charge in coulombs.
★★★☆☆Joules to Watts Calculator
Convert joules to watts by dividing energy by time in seconds: P = E ÷ t. Find the average power needed to deliver a given amount of energy.
★★★☆☆Watts to kVA Calculator
Convert watts to kilovolt-amps (kVA) using power factor: kVA = W ÷ (PF × 1,000). Find the generator, UPS or transformer size for your load.
★★★★☆Amps to kW Calculator
Convert amps to kilowatts (kW) for DC, single-phase and three-phase circuits. Multiply current by voltage (and power factor and √3 for AC) and divide by 1,000.
★★★★★Capacitance to Charge Calculator
Calculate electric charge from capacitance and voltage with Q = C × V, in pF, nF, μF, mF or F. Also shows stored energy, E = ½CV².
★★★☆☆💡 Understanding Electrical Conversions
Electrical conversions are fundamental to anyone working with circuits — from homeowners planning electrical work to licensed electricians, engineers, and HVAC technicians. In the United States, most residential circuits operate at 120 volts (standard outlets) or 240 volts (large appliances like dryers, ovens, and AC units), while commercial and industrial facilities use 208V, 277V, and 480V systems.
Our calculators use Watt's Law (P = I × V) and Ohm's Law (V = I × R) — the two foundational electrical formulas. For AC circuits, we include the power factor (PF), which accounts for the phase difference between voltage and current in inductive or capacitive loads. Three-phase calculations use the √3 (1.732) multiplier for line-to-line voltage conversions.
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