Basic Circuits

Capacitance Calculator

Calculate capacitance from charge and voltage, plate geometry, or frequency and reactance, then review readable units, dielectric shortcuts.

Coulomb's Law Calculator

Solve electric force, one missing point charge, or separation distance with a Coulomb's law calculator that handles small charge units, known-force units.

Current Calculator

Calculate electrical current from voltage and resistance, power and voltage, or power and resistance, with exact equations, current-scale conversions.

Electrical Load Calculator

Use this electrical load calculator to estimate residential demand amps, panel size, service headroom, and future-upgrade impact from dwelling area.

eV to Volts Calculator

Convert electron-volts to volts from charge count or coulombs, with eV-to-joule working, particle examples, and same-energy charge comparisons.

Linear Charge Density Converter

Convert electric charge per unit length between metre-, centimetre-, and millimetre-based units, with full supported-unit equivalents and SI base-value context.

Linear Current Density Converter

Convert electric current per unit length between metre-, centimetre-, and millimetre-based units, with full supported-unit equivalents and base A/m context.

Ohms Law Calculator

Use this ohm's law calculator to solve voltage, current, resistance, and power from exactly two known values with unit selectors, quick examples.

Parallel Plate Capacitance Calculator

Solve capacitance, plate area, plate separation, or dielectric constant for an ideal parallel-plate capacitor, with optional electric-field, stored-charge.

Parallel Resistor Calculator

Use the parallel resistor calculator to solve equivalent resistance, branch current sharing, and optional power breakdown for two or more resistors in parallel.

Peak Voltage Calculator

Convert sine-wave RMS or peak-to-peak voltage into peak voltage, with the supporting RMS and peak-to-peak values shown beside the result.

Peak-to-Peak Voltage Calculator

Convert RMS or peak sine-wave voltage into peak-to-peak voltage with the supporting RMS and peak values shown beside the result.

Power Factor Calculator

Calculate AC power factor from real and apparent power, or from phase angle, with leading or lagging load context and supporting reactive-power figures.

RC Circuit Calculator

Calculate RC time constant, cutoff frequency, charge/discharge timing, filter gain, impedance, and resistor or capacitor values from target τ or cutoff.

Resistance Calculator

Calculate resistance from voltage and current, voltage and power, or power and current, with the exact working equation shown.

Resistor Calculator

Decode 4-band and 5-band resistor colour codes, or calculate total resistance for resistor lists in series and parallel.

Resistor Color Code Calculator

Decode 3-band, 4-band, 5-band, and 6-band resistor color codes or reverse-lookup the closest band sequence from a target resistance, with tolerance, tempco.

RLC Impedance Calculator

Use this RLC impedance calculator to compare series and parallel impedance, phase angle, resonance frequency, quality factor, estimated bandwidth.

RMS Voltage Calculator

Convert sine-wave peak, peak-to-peak, or rectified average voltage into RMS voltage.

Series and Parallel Capacitor Calculator

Use this series and parallel capacitor calculator to find equivalent capacitance, charge, energy, voltage split.

Series Resistor Calculator

Series resistor calculator for total resistance, current through series resistors, voltage drop across each resistor, power dissipation, resistance share.

Surface Charge Density Converter

Convert surface charge density between C/m², mC/m², µC/m², nC/m², C/cm², and C/mm² with a clear SI base-value table.

Surface Current Density Converter

Convert electric current per unit area between A/m², mA/m², µA/m², kA/m², A/cm², mA/cm², µA/cm², A/mm², A/ft², mA/ft², and µA/in².

Voltage Calculator

Calculate voltage from current and resistance, power and current, or power and resistance, with the exact working equation shown.

Voltage Divider Calculator

Calculate the unloaded output voltage of a two-resistor divider from source voltage and resistor values.

Volts to eV Calculator

Convert voltage into electron-volts from either elementary-charge count or direct charge in coulombs.

Volume Charge Density Converter

Convert electric charge per unit volume between C/m³, μC/m³, C/cm³, and other supported volume charge density units.