Electromagnetism calculators
41 calculators Capacitance Calculator Find capacitance from charge and voltage (C = Q/V) or from parallel plate geometry (κ·ε0·A/d) with a dielectric table. Get stored charge, energy, and field strength.
Open Electric Field Calculator Find electric field strength three ways: from a point charge (E = kq/r²), parallel plates (E = V/d), or force on a test charge (E = F/q), with force output.
Open Power Dissipation Calculator Find electrical power dissipated as heat from any two of voltage, current and resistance, or across a series or parallel resistor network, with cost estimate.
Open Voltage Drop Calculator Find voltage drop, percent drop and voltage at the load for DC, single or three phase runs. Pick a wire size or enter resistance, with power factor and energy cost.
Open Watts to Amps Calculator Convert watts to amps for DC, single-phase and three-phase AC. Set voltage, power factor and line type, see the work, milliamps, and an optional running-cost estimate.
Open AC Wattage Calculator Calculate AC wattage from amps and volts (single or three-phase) or from BTU and EER rating. Includes daily, monthly, and yearly electricity cost estimates.
Open Acceleration in the Electric Field Calculator Calculate the acceleration, force, final velocity, and kinetic energy of a charged particle in a uniform electric field. Includes electron, proton, and alpha-particle presets.
Open Conductivity to Resistivity Calculator Convert electrical conductivity to resistivity or reverse. Choose a preset material or enter a custom value with unit switches, worked steps, and a materials reference table.
Open Coulomb's Law Calculator Calculate the electrostatic force between two charges using Coulomb's Law. Solve for force, charge, or distance with metric unit switching and step-by-step math.
Open Cutoff Frequency Calculator: RC, RL, and LC Filters Find the -3 dB cutoff frequency for RC, RL, or LC filters. Reverse-solve for R, C, or L. Shows time constant, angular frequency, Bode plot, and step-by-step math.
Open Cyclotron Frequency Calculator Calculate cyclotron frequency, angular frequency, and orbital period for protons, electrons, and alpha particles. Particle presets, unit switches, and worked steps.
Open Delta to Wye Conversion Calculator Convert resistor networks between delta and wye (star) configurations. Enter three resistance values, get the equivalent network instantly, with step-by-step working.
Open Dipole Moment Calculator Calculate the electric dipole moment from charge and separation, or reverse-solve for charge or distance. Get results in Debye and C*m with a worked example.
Open Drift Velocity Calculator Calculate drift velocity using three methods: current-density, mobility times field, or Drude model. Includes worked steps, reference table, and charts.
Open Electric Motor Torque Calculator Calculate electric motor torque from power and speed, or find synchronous speed and slip for AC motors, or solve DC motor torque from voltage, current and efficiency.
Open Electric Potential Calculator Calculate electric potential V = kq/r for a point charge. Reverse-solve for charge or distance, compute potential difference, and apply superposition for two charges.
Open Electrical Power Calculator Calculate electrical power (watts), voltage, current, and resistance instantly. Enter any two values and solve all four using Ohm's Law and Watt's Law.
Open Energy Density of Fields Calculator Calculate energy density stored in electric and magnetic fields. Supports vacuum and custom media, total energy from volume, and reverse-solve for field strength.
Open Excess Electrons Calculator Convert electric charge (coulombs) to the number of excess electrons, or find the charge from an electron count. Shows the full worked calculation.
Open Faraday's Law Calculator Calculate induced EMF, magnetic flux change, number of turns, time interval, or coil area using Faraday's law. Six solve modes with step-by-step working.
Open Free Space Path Loss Calculator Calculate free space path loss in dB from frequency, distance, antenna gains and feeder losses. Instant results with a worked example, chart, and link budget.
Open Fresnel Zone Calculator Calculate the first Fresnel zone radius, obstruction clearance, nth zone radius, and earth-bulge correction for any wireless link. Metric and imperial, instant results.
Open Gauss's Law Calculator Calculate electric flux, field strength, and enclosed charge with Gauss's Law. Supports spherical, cylindrical, planar, and general surfaces with step-by-step math.
Open Hall Coefficient Calculator Calculate the Hall coefficient, carrier concentration, mobility, Hall angle and resistivity from Hall voltage, sample thickness, current and magnetic field.
Open HP to Amps Calculator Convert horsepower to amps instantly for DC, single-phase, and three-phase AC motors. Enter HP, voltage, efficiency, and power factor to get full-load current.
Open Inductive Reactance Calculator Calculate inductive reactance (XL), frequency, or inductance instantly. Supports Hz to GHz, H to nH unit switching, admittance output, and a worked example.
Open Insertion Loss Calculator Calculate insertion loss in dB from power or voltage ratios, cascade multiple segments, or budget a fiber optic link with connectors, splices and attenuation.
Open Internal Resistance Calculator Calculate internal resistance, EMF, terminal voltage, current, power loss, and efficiency for any battery or voltage source. Solve for any unknown in seconds.
Open kVA Calculator Calculate kVA from amps and voltage, or from kW and power factor, for single-phase and three-phase systems. Get kW, kVAR, and amps instantly.
Open Lorentz Force Calculator Calculate the Lorentz force on a moving charged particle. Solve for force, charge, velocity, field, or angle, with particle presets and worked steps.
Open Magnetic Declination Calculator Calculate magnetic declination by latitude, longitude, and date. Get the angle between true north and magnetic north, the annual change rate, and corrected bearings.
Open Magnetic Dipole Moment Calculator Calculate the magnetic dipole moment of a current loop, solenoid, or permanent magnet. Get torque and potential energy in an external field, with step-by-step working.
Open Magnetic Field of a Straight Current-Carrying Wire Calculator Calculate the magnetic field produced by a long, straight current-carrying wire using the Biot-Savart law. Solve for B, current, or distance with unit switching.
Open Magnetic Permeability Calculator Calculate permeability, relative permeability, susceptibility, flux density, field strength, and permeance. Six solve modes with a material reference table.
Open Power Factor Calculator Calculate power factor, real power, reactive power, apparent power, phase angle, impedance and correction capacitor size for single-phase and three-phase AC circuits.
Open Skin Depth Calculator Calculate electromagnetic skin depth for copper, aluminum, silver, iron and custom conductors. Full formula, worked example, frequency chart and material table.
Open Volt to Electron Volt Calculator Convert volts to electron volts instantly. Enter voltage and charge in elementary charges or coulombs. Includes the V to eV formula and reverse eV to V conversion.
Open VSWR Calculator - Voltage Standing Wave Ratio Calculate VSWR, reflection coefficient, return loss, mismatch loss, and reflected power from any RF input. Switch between VSWR, return loss, and impedance modes.
Open Watt Calculator Solve for power, voltage, current, or resistance. Enter any two quantities to get the others with Ohm and Watt laws, for DC and AC with power factor.
Open Watt-Hour Calculator Calculate watt-hours from watts and time or from volts and amp-hours. Get kWh, amp-hours, battery runtime, and daily electricity cost in one tool.
Open Watts to Lux Calculator Convert watts to lux instantly using luminous efficacy and area. Supports 11 light source presets, metric and imperial area, and reverse lux-to-watts mode.
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