Electrical Calculators β 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.
β β β β βWatts 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.
β β β β βVolts 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.
β β β β βWatts 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.
β β β β βAmps 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.
β β β β βVolts 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.
β β β β βkVA to Amps Calculator
Convert kilovolt-amps (kVA) to amps for single-phase and three-phase AC circuits. Essential for generator sizing and transformer calculations.
β β β β βAmps to kVA Calculator
Convert amps to kilovolt-amps (kVA) for single-phase and three-phase circuits. Calculate apparent power for generator and transformer sizing.
β β β β βWatts 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.
β β β β βkWh 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.
β β β β βkW to Amps Calculator
Convert kilowatts (kW) to amps for DC and AC circuits. Enter power in kW and voltage to calculate current draw. Supports single-phase and three-phase AC with power factor.
β β β β βkW to kVA Calculator
Convert kilowatts (kW) to kilovolt-amps (kVA) using power factor. Essential for generator and transformer sizing in commercial and industrial applications.
β β β β βkW to kWh Calculator
Convert kilowatts (kW) to kilowatt-hours (kWh) to calculate energy consumption over time. Estimate daily, monthly, and yearly electricity costs.
β β β β βkW to VA Calculator
Convert kilowatts (kW) to volt-amps (VA) using power factor. Calculate the apparent power in VA needed for your electrical equipment.
β β β β βkWh to kW Calculator
Convert kilowatt-hours (kWh) to kilowatts (kW) to determine average power consumption from energy usage data. Useful for analyzing electricity bills.
β β β β βkVA to HP Calculator
Convert kilovolt-amps (kVA) to horsepower (HP) for electric motor sizing. Includes power factor and motor efficiency adjustments.
β β β β βkVA to kW Calculator
Convert kilovolt-amps (kVA) to kilowatts (kW) using power factor. Find the real power output of generators, transformers, and UPS systems.
β β β β βkVA to VA Calculator
Convert kilovolt-amps (kVA) to volt-amps (VA). Simple unit conversion multiplying by 1,000. Useful for UPS and power supply specifications.
β β β ββkVA to Watts Calculator
Convert kilovolt-amps (kVA) to watts using power factor. Calculate the real power in watts delivered by a generator, transformer, or UPS.
β β β β βAh to kWh Calculator
Convert amp-hours (Ah) to kilowatt-hours (kWh) for battery capacity calculations. Essential for solar, RV, and EV battery system design.
β β β β βAh to Wh Calculator
Convert amp-hours (Ah) to watt-hours (Wh) to find the energy capacity of batteries. Multiply Ah by voltage to get Wh.
β β β β βWh to Ah Calculator
Convert watt-hours (Wh) to amp-hours (Ah) for battery capacity. Divide Wh by voltage to determine the Ah rating needed.
β β β β βWh to mAh Calculator
Convert watt-hours (Wh) to milliamp-hours (mAh) for smartphone, laptop, and portable device battery comparisons. Uses nominal voltage.
β β β β βmAh to Wh Calculator
Convert milliamp-hours (mAh) to watt-hours (Wh) to compare battery energy across devices. Essential for understanding smartphone and laptop battery life.
β β β β βkWh to Ah Calculator
Convert kilowatt-hours (kWh) to amp-hours (Ah) for battery bank sizing. Find how many Ah of battery capacity you need for a given energy requirement.
β β β β βAmps to VA Calculator
Convert amps to volt-amps (VA) for single-phase and three-phase circuits. Calculate apparent power for UPS and power supply sizing.
β β β β βVA to Amps Calculator
Convert volt-amps (VA) to amps for single-phase and three-phase circuits. Determine current draw from apparent power ratings.
β β β β βVA to kVA Calculator
Convert volt-amps (VA) to kilovolt-amps (kVA). Simple unit conversion dividing by 1,000. Commonly used for transformer and UPS ratings.
β β β ββVA to kW Calculator
Convert volt-amps (VA) to kilowatts (kW) using power factor. Find the real power from a VA-rated UPS, transformer, or generator.
β β β β βAmps to HP Calculator
Convert amps to horsepower (HP) for electric motors. Enter current, voltage, power factor, and motor efficiency to calculate mechanical horsepower output.
β β β β βHP to Amps Calculator
Convert horsepower (HP) to amps for electric motors. Calculate current draw for DC, single-phase AC, and three-phase AC motors with efficiency and power factor.
β β β β βHP to kVA Calculator
Convert horsepower (HP) to kilovolt-amps (kVA) for generator and transformer sizing. Includes power factor and motor efficiency for accurate results.
β β β β βVolts to Joules Calculator
Convert volts to joules using electric charge (coulombs). Calculate the energy in joules transferred by a voltage across a charge. J = V Γ C.
β β β β βWatts to Joules Calculator
Convert watts to joules by multiplying power by time in seconds. Calculate energy output from any power source. J = W Γ s.
β β β β βJoules to Volts Calculator
Convert joules to volts using electric charge (coulombs). Calculate the voltage from energy and charge: V = J / C.
β β β ββJoules to Watts Calculator
Convert joules to watts by dividing energy by time in seconds. Find the power output from a given energy transfer: W = J / s.
β β β ββWatts to kVA Calculator
Convert watts to kilovolt-amps (kVA) using power factor. Calculate the apparent power rating needed for your electrical load.
β β β β βAmps to kW Calculator
Convert amps to kilowatts (kW) for DC and AC circuits. Enter current (amps) and voltage to calculate real power in kilowatts.
β β β β βCapacitance to Charge Calculator
Calculate electric charge (coulombs) from capacitance and voltage using Q = C Γ V. Supports pF, nF, ΞΌF, mF, and F units.
β β β ββπ‘ Understanding Electrical Conversions
Electrical conversions are fundamental to anyone working with circuits β 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 Γ V) and Ohm's Law (V = I Γ R) β 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 β3 (1.732) multiplier for line-to-line voltage conversions.
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