Electricity Calculators & Tools

Apply Ohm's law to find voltage, current, or resistance.

Calculate electrical power in watts from voltage, current, or resistance.

Calculate electrical power, voltage, current, resistance, or energy with power formulas.

Calculate voltage, current, resistance, power, energy, charge, and time.

Calculate electrostatic force, charge, or distance between point charges.

Read resistor color codes, calculate series, parallel, and wire resistance.

Calculate electric field strength, force, charge, or distance.

Calculate electric potential, charge, distance, potential energy, or work.

Calculate resistivity, wire resistance, conductor dimensions, or conductivity.

Calculate conductance, resistance, conductivity, current, or voltage.

Calculate equivalent resistance for two or more resistors in parallel.

Find equivalent resistance for mixed series-parallel resistor networks.

Calculate the current-limiting resistor for LED circuits with standard resistor recommendations.

Calculate output voltage, resistor values, and loaded divider behavior.

Calculate how current splits across parallel resistor branches.

Apply KCL and KVL to solve for unknown currents, voltages, and single-loop circuits.

Check bridge balance, find unknown resistance, and calculate output voltage.

Calculate capacitance, charge, voltage, stored energy, and parallel-plate capacitance.

Find equivalent capacitance for capacitors in series or parallel.

Calculate capacitance, area, separation, or permittivity for a parallel-plate capacitor.

Calculate RC time constant, charging voltage, discharging voltage, charge, current, energy, and time to target.

Calculate energy stored in a capacitor from capacitance, voltage, or charge.

Calculate voltage drop, load voltage, drop percentage, conductor resistance, and power loss.

Calculate capacitive reactance, capacitance, frequency, AC current, or voltage.

Calculate inductance, inductor voltage, current change rate, energy, or solenoid inductance.

Calculate energy stored in an inductor from inductance and current.

Calculate inductive reactance, inductance, frequency, AC current, or voltage.

Calculate AC impedance for series RC, RL, and RLC circuits with phase angle and power factor.

Calculate RC time constant, cutoff frequency, resistance, capacitance, and voltage.

Calculate RL time constant, current rise, current decay, inductance, and resistance.

Analyze RC transient charging/discharging, time constants, and low-pass/high-pass filter response.

Calculate series RLC impedance, current, voltage drops, resonant frequency, Q factor, and bandwidth.

Calculate LC/RLC resonant frequency, find L or C for target resonance, Q factor, and bandwidth.

Calculate RC high-pass filter cutoff frequency, gain, phase, and output voltage at any frequency.

Calculate RC low-pass filter cutoff frequency, gain, phase, and output voltage at any frequency.

Calculate RC or RL cutoff frequency, find components for target cutoff, and compare filter types.

Calculate power factor, phase angle, real/reactive/apparent power for single and three-phase AC circuits.

Convert kVA to kW, kW to kVA, and calculate power factor for single and three-phase systems.

Convert kW to kVA, kVA to kW, and calculate power factor for single and three-phase systems.

Calculate battery runtime from capacity and current, energy, duty cycle, and efficiency.

Calculate required battery capacity, Ah/Wh conversions, runtime, and duty-cycle sizing.

Decode 3-digit, 4-digit, EIA-96, and R-notation SMD resistor codes or encode resistance values.

Convert dBm to watts, watts to dBm, milliwatts, dBW, and RMS voltage with impedance.

Convert joules, kWh, BTU, therms, calories, electronvolts, and other energy units.