⚡ Electricity & Magnetism Calculators
Circuits, fields, capacitors, inductors and AC power. Browse 42 free electricity & magnetism calculators, each with the formula, a worked example and an interactive chart.
Ohm's Law CalculatorFind voltage, current or resistance and power in a circuit.Electric Power CalculatorCompute electrical power from voltage and current.Electricity Cost CalculatorEstimate energy use and running cost of an appliance.Resistors in Series CalculatorTotal resistance of resistors connected in series.Resistors in Parallel CalculatorEquivalent resistance of resistors in parallel.Voltage Divider CalculatorFind output voltage of a two-resistor divider.Current Divider CalculatorSplit current between two parallel branches.LED Resistor CalculatorChoose the series resistor for an LED.Capacitor Energy CalculatorFind energy and charge stored in a capacitor.Capacitors in Series and Parallel CalculatorCombine capacitors to find total capacitance.RC Time Constant CalculatorFind time constant and charge time of an RC circuit.RL Time Constant CalculatorFind the time constant of an inductor circuit.LC Resonant Frequency CalculatorFind resonant frequency of an LC circuit.Inductive and Capacitive Reactance CalculatorCompute reactance of an inductor and capacitor at a frequency.Series RLC Impedance CalculatorFind impedance, current and phase angle of a series RLC circuit.Coulomb's Law CalculatorCompute electric force between two charges.Electric Field of a Point Charge CalculatorFind electric field strength and potential at a distance from a charge.Parallel Plate Capacitor CalculatorFind capacitance from plate area and gap.Magnetic Field of a Straight Wire CalculatorFind magnetic field at a distance from a current-carrying wire.Solenoid Magnetic Field CalculatorCompute magnetic field inside a solenoid.Magnetic Force on a Moving Charge CalculatorFind the force on a charge moving in a magnetic field.Cyclotron Radius CalculatorFind radius and frequency of a charged particle in a magnetic field.Faraday's Law (Induced EMF) CalculatorCompute induced emf from changing magnetic flux.Transformer CalculatorFind secondary voltage and current of an ideal transformer.AC Voltage RMS and Peak CalculatorConvert between peak, RMS and peak-to-peak voltage.Power Factor CalculatorFind real, reactive and apparent power in an AC circuit.Three-Phase Power CalculatorCompute power in a three-phase system.Battery Life CalculatorEstimate how long a battery will last.Wire Resistance CalculatorCompute resistance and voltage drop of a wire.Resistor Tolerance Range CalculatorFind minimum and maximum resistance from value and tolerance.Wheatstone Bridge CalculatorFind the unknown resistance of a balanced bridge.Two-Source Node Voltage CalculatorFind node voltage of two sources feeding one load.Electron Drift Velocity CalculatorCompute drift velocity of electrons in a wire.Joule Heating CalculatorFind heat produced by current in a resistor.RC Filter Cutoff Frequency CalculatorFind the cutoff frequency of an RC low-pass or high-pass filter.Skin Depth CalculatorFind how deep AC current penetrates a conductor.Electric Potential Energy CalculatorEnergy of two point charges at a separation.Inductor Energy CalculatorFind energy stored in an inductor.Solenoid Inductance CalculatorFind inductance of an air-core solenoid.Mass Spectrometer Radius CalculatorFind the path radius of an ion in a mass spectrometer.Charge, Current and Time CalculatorRelate charge, current and time.Capacitor Dielectric Breakdown Voltage CalculatorEstimate breakdown voltage across an insulating gap.
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