Ohm's Law Calculator
Solve for voltage, current, or resistance using Ohm's Law (V = I × R), plus power.
Open Calculator →Amps to Volts Conversion Calculator
Convert current to voltage using resistance or power.
Open Calculator →Amps to Watts Calculator
Convert current to power using voltage or resistance.
Open Calculator →Joules to Volts Conversion Calculator
Convert energy to voltage using electric charge.
Open Calculator →Joules to Watts Conversion Calculator
Convert energy to power using elapsed time.
Open Calculator →Power Calculator
Find electrical power from voltage and current, current and resistance, or voltage and resistance.
Open Calculator →Power Factor Calculator
Find apparent power and power factor from real and reactive power.
Open Calculator →Voltage Divider Calculator
Find the output voltage across R2 in a two-resistor voltage divider.
Open Calculator →Voltage Drop Calculator
Find the voltage lost across a circuit's resistance from current and resistance.
Open Calculator →Volts to Amps Conversion Calculator
Convert voltage to current using resistance or power.
Open Calculator →Volts to Joules Conversion Calculator
Convert voltage to energy using electric charge.
Open Calculator →Volts to Watts Conversion Calculator
Convert voltage to power using current or resistance.
Open Calculator →Watts to Amps Calculator
Convert power to current using voltage or resistance.
Open Calculator →Watts to Joules Conversion Calculator
Convert power to energy using elapsed time.
Open Calculator →Watts to Volts Conversion Calculator
Convert power to voltage using current or resistance.
Open Calculator →#2 Gauge Wire
Calculate voltage drop, percent drop, diameter, and area for a 2 AWG copper or aluminum wire run.
Open Calculator →AWG to mm Calculator
Convert any American Wire Gauge (AWG) size to diameter in mm and inches, area in mm² and kcmil.
Open Calculator →SWG to mm Calculator
Look up the diameter and cross-sectional area for any Standard (British) Wire Gauge (SWG) size.
Open Calculator →Wire Gauge Calculator
Calculate wire resistance, voltage drop, and diameter for any standard AWG wire size, copper or aluminum.
Open Calculator →Resistor Calculator
Decode 4-band or 5-band resistor color codes into resistance, tolerance, and value range.
Open Calculator →eV to Volts Calculator
Convert energy in electron-volts (eV) and charge into voltage using the eV-to-volts relationship.
Open Calculator →Volts to eV Calculator
Convert a voltage and charge into an energy in electron-volts (eV).
Open Calculator →Watts-Volts-Amps-Ohms Calculator
Enter any two of watts, volts, amps, or ohms to instantly solve for the other two.
Open Calculator →Electricity Calculator
Calculate the energy used and cost of running a single appliance or device.
Open Calculator →Amps to kVA Calculator
Convert amps and voltage to kVA (apparent power) for single-phase and three-phase AC circuits.
Open Calculator →Amps to kW Calculator
Convert amps, voltage, and power factor to kW (real power) for single-phase and three-phase AC circuits.
Open Calculator →Amps to VA Calculator
Convert amps and voltage to VA (apparent power) for single-phase and three-phase AC circuits.
Open Calculator →kVA to Amps Calculator
Convert kVA and voltage to amps for single-phase and three-phase AC circuits.
Open Calculator →kVA to kW Calculator
Convert kVA to kW (real power) using the power factor.
Open Calculator →kVA to VA Calculator
Convert kVA to VA (volt-amps) instantly.
Open Calculator →kVA to Watts Calculator
Convert kVA to watts (real power) using the power factor.
Open Calculator →kW to Amps Calculator
Convert kW, voltage, and power factor to amps for single-phase and three-phase AC circuits.
Open Calculator →kW to kVA Calculator
Convert kW to kVA (apparent power) using the power factor.
Open Calculator →kW to VA Calculator
Convert real power in kilowatts to apparent power in volt-amps using power factor.
Open Calculator →kW to Volts Calculator
Find voltage from real power, current, and power factor for single-phase or three-phase AC circuits.
Open Calculator →VA to Amps Calculator
Convert apparent power (VA) to current in amps for single-phase or three-phase circuits.
Open Calculator →VA to kVA Calculator
Convert apparent power from volt-amps (VA) to kilovolt-amps (kVA).
Open Calculator →VA to kW Calculator
Convert apparent power (VA) to real power in kilowatts using power factor.
Open Calculator →VA to Watts Calculator
Convert apparent power (VA) to real power in watts using power factor.
Open Calculator →Volts to kW Calculator
Calculate real power in kilowatts from voltage, current, and power factor, single-phase or three-phase.
Open Calculator →Watts to kVA Calculator
Convert real power in watts to apparent power in kilovolt-amps using power factor.
Open Calculator →Watts to VA Calculator
Convert real power (W) to apparent power (VA) using a power factor, with a plain explanation of the difference.
Open Calculator →kW to kWh Calculator
Convert kilowatts and hours of use into total energy in kilowatt-hours (kWh).
Open Calculator →kWh to kW Calculator
Convert kilowatt-hours and hours of use into an average power draw in kilowatts.
Open Calculator →kWh to Watts Calculator
Convert kilowatt-hours and hours of use into an average power draw in watts.
Open Calculator →Watts to kWh Calculator
Convert watts and hours of use into total energy in kilowatt-hours (kWh).
Open Calculator →Electricity Bill Calculator
Estimate a total electricity bill from a list of appliances, their wattage, daily run time, and your rate per kWh.
Open Calculator →Energy Consumption Calculator
Calculate daily, monthly, and annual energy consumption in kWh from a device's wattage and run time.
Open Calculator →Energy Cost Calculator
Calculate the total electricity cost from a kWh usage figure, a rate per kWh, and an optional fixed service fee.
Open Calculator →Amps to Horsepower Calculator
Convert current, voltage, and power factor into mechanical horsepower for single-phase and three-phase AC motors.
Open Calculator →Amps to Kilovolt-Amps (kVA) Conversion Calculator
Convert amps and voltage to kVA (apparent power) for single-phase and three-phase AC circuits.
Open Calculator →Amps to Kilowatts (kW) Conversion Calculator
Convert amps, voltage, and power factor to kW (real power) for single-phase and three-phase AC circuits.
Open Calculator →Amps to Volt-Amps (VA) Conversion Calculator
Convert amps and voltage to VA (apparent power) for single-phase and three-phase AC circuits.
Open Calculator →Horsepower to Amps Calculator
Convert mechanical horsepower, voltage, and power factor into the current an AC motor draws.
Open Calculator →Horsepower to Kilovolt-Amps (kVA) Conversion Calculator
Convert mechanical horsepower to apparent power (kVA) using the power factor.
Open Calculator →Kilovolt-Amps (kVA) to Amps Conversion Calculator
Convert kVA and voltage to amps for single-phase and three-phase AC circuits.
Open Calculator →Kilovolt-Amps (kVA) to Horsepower Conversion Calculator
Convert apparent power (kVA) to mechanical horsepower using the power factor.
Open Calculator →Kilovolt-Amps (kVA) to Kilowatts (kW) Conversion Calculator
Convert kVA to kW (real power) using the power factor.
Open Calculator →Kilovolt-Amps (kVA) to Volt-Amps (VA) Conversion Calculator
Convert kVA to VA (volt-amps) instantly.
Open Calculator →Kilovolt-Amps (kVA) to Watts Conversion Calculator
Convert kVA to watts (real power) using the power factor.
Open Calculator →Kilowatts (kW) to Amps Conversion Calculator
Convert kW, voltage, and power factor to amps for single-phase and three-phase AC circuits.
Open Calculator →Kilowatts (kW) to Kilovolt-Amps (kVA) Conversion Calculator
Convert real power in kilowatts to apparent power in kilovolt-amps using the power factor.
Open Calculator →Kilowatts (kW) to Volt-Amps (VA) Conversion Calculator
Convert real power in kilowatts to apparent power in volt-amps using the power factor.
Open Calculator →Volt-amps (VA) to Amps Conversion Calculator
Convert apparent power in volt-amps to amps using voltage, for single-phase or three-phase circuits.
Open Calculator →Volt-Amps (VA) to Kilovolt-Amps (kVA) Conversion Calculator
Convert apparent power in volt-amps to kilovolt-amps instantly.
Open Calculator →Volt-amps (VA) to Kilowatts (kW) Conversion Calculator
Convert apparent power in volt-amps to real power in kilowatts using the power factor.
Open Calculator →Watts to Kilovolt-Amps (kVA) Conversion Calculator
Convert real power in watts to apparent power in kilovolt-amps using the power factor.
Open Calculator →Current Calculator
Solve for electric current, charge, or time using the current-as-charge-over-time relationship.
Open Calculator →Voltage Calculator
Solve for voltage, energy, or electric charge using the energy-per-charge definition of voltage.
Open Calculator →Wattage Calculator
Solve for average power, energy, or duration using the energy-over-time definition of power.
Open Calculator →Peak Voltage Calculator
Calculate a sine wave's peak voltage from its RMS or peak-to-peak voltage.
Open Calculator →Peak-to-Peak Voltage Calculator
Calculate a sine wave's peak-to-peak voltage from its peak or RMS voltage.
Open Calculator →RMS Voltage Calculator
Calculate a sine wave's RMS voltage from its peak or peak-to-peak voltage.
Open Calculator →2026 Electricity Cost Calculator
Add appliances with their own wattage, hours per day, and days used to estimate a whole-home electricity cost at your own rate per kWh.
Open Calculator →2026 Lighting Energy Cost Calculator
Estimate lighting energy cost from a list of bulbs by brightness and technology, with a built-in LED savings comparison.
Open Calculator →Amp-Hours (Ah) to Kilowatt-Hours (kWh) Conversion Calculator
Convert amp-hours to kilowatt-hours using a battery's voltage — Ah alone isn't an energy figure without it.
Open Calculator →Amp-Hours (Ah) to Watt-Hours (Wh) Conversion Calculator
Convert amp-hours to watt-hours using a battery's voltage, the unit most manufacturers and airlines actually compare.
Open Calculator →Kilowatt-Hours (kWh) to Amp-Hours (Ah) Conversion Calculator
Convert a kWh energy figure to amp-hours at a given voltage, for battery bank and wiring sizing.
Open Calculator →Kilowatt-Hours (kWh) to Kilowatts (kW) Conversion Calculator
Convert kilowatt-hours and hours of use into an average power draw in kilowatts.
Open Calculator →Kilowatt-Hours (kWh) to Watts Conversion Calculator
Convert kilowatt-hours and hours of use into an average power draw in watts.
Open Calculator →Kilowatts (kW) to Kilowatt-Hours (kWh) Conversion Calculator
Convert kilowatts and hours of use into total energy in kilowatt-hours (kWh).
Open Calculator →Milliamp-Hours (mAh) to Watt-Hours (Wh) Conversion Calculator
Convert milliamp-hours to watt-hours using a cell's nominal voltage — the unit airline battery limits are actually written in.
Open Calculator →Watt-Hours (Wh) to Amp-Hours (Ah) Conversion Calculator
Convert watt-hours to amp-hours at a given voltage, for sizing battery capacity from an energy spec.
Open Calculator →Watt-Hours (Wh) to Milliamp-Hours (mAh) Conversion Calculator
Convert watt-hours to milliamp-hours using a cell's nominal voltage, for comparing against mAh-labeled batteries.
Open Calculator →Watts to Kilowatt-Hours (kWh) Conversion Calculator
Convert watts and hours of use into total energy in kilowatt-hours (kWh).
Open Calculator →Capacitance Calculator
Solve for charge, capacitance, or voltage using Q = C × V, with unit choices for each.
Open Calculator →Capacitance to Charge Conversion Calculator
Convert a capacitance and voltage directly into stored charge using Q = C × V.
Open Calculator →Coulomb's Law Charge Calculator
Find the electrostatic force between two point charges and whether it's attractive or repulsive.
Open Calculator →LED Resistor Calculator
Calculate the series current-limiting resistor an LED needs, plus its power dissipation.
Open Calculator →Parallel Plate Capacitance Calculator
Calculate capacitance from plate area, separation, and dielectric material using C = ε₀ × εr × A ÷ d.
Open Calculator →Parallel Resistor Calculator
Calculate the total resistance of any number of resistors wired in parallel.
Open Calculator →Resistance Calculator
Calculate a conductor's resistance from its material, length, and cross-section using R = ρ × L ÷ A.
Open Calculator →Resistor Capacitor Circuit Calculator
Find an RC circuit's time constant and capacitor voltage during charging or discharging.
Open Calculator →RLC Impedance Calculator
Calculate a series RLC circuit's reactance, impedance, and phase angle from R, L, C, and frequency.
Open Calculator →Series and Parallel Capacitor Calculator
Calculate the combined capacitance of capacitors wired in series or in parallel.
Open Calculator →Series Resistor Calculator
Calculate the total resistance of any number of resistors wired in series.
Open Calculator →Charge Conversion Calculators
Convert electric charge between coulombs, millicoulombs, microcoulombs, nanocoulombs, and picocoulombs.
Open Calculator →Conductance Conversion Calculators
Convert electrical conductance between siemens, millisiemens, microsiemens, and kilosiemens.
Open Calculator →Electric Charge Conversion
Convert a charge value between coulombs and its millicoulomb, microcoulomb, nanocoulomb, and picocoulomb multiples.
Open Calculator →Electric Current Conversion
Convert electric current between kiloamps, amps, milliamps, and microamps.
Open Calculator →Electrical Conductance Conversion
Convert a conductance value between siemens and its millisiemens, microsiemens, and kilosiemens multiples.
Open Calculator →Electrical Inductance Conversion
Convert electrical inductance between henries, millihenries, microhenries, and nanohenries.
Open Calculator →Electrical Resistance Conversion
Convert electrical resistance between megaohms, kilohms, ohms, and milliohms.
Open Calculator →Inductance Conversion Calculators
Convert inductance between henries, millihenries, microhenries, and nanohenries.
Open Calculator →Mixed Electrical Unit Conversion
Convert between units for voltage, current, resistance, power, charge, capacitance, inductance, or conductance, all in one tool.
Open Calculator →Energy Conversion Calculators
Convert energy between joules, kilojoules, watt-hours, kilowatt-hours, calories, kilocalories, and BTU.
Open Calculator →Wire Ampacity Calculator
Look up NEC Table 310.16 base ampacity ratings for AWG copper or aluminum wire at 60°C, 75°C, or 90°C.
Open Calculator →Wire Size Calculator
Find the smallest AWG copper or aluminum wire size that meets a required ampacity under NEC Table 310.16.
Open Calculator →