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Calculators
Focused engineering tools for fast, well-defined problems.
25 calculators · Electrical Engineering
Electrical Engineering
25 calculatorsDomain overview →
DC Networks & Kirchhoff
- Ohm's Law CalculatorSolve voltage, current or resistance from the other two, with signed values and absorbed power.
- Series & Parallel Resistor CalculatorEquivalent resistance and conductance of up to 8 resistors, with each resistor's share of voltage or current.
- Voltage Divider CalculatorUnloaded two-resistor divider: output voltage, current, drops and dissipated powers.
- Current Divider CalculatorConductance-based split of a total current across up to 8 parallel branches.
- Thévenin & Norton Equivalent CalculatorV_th, R_th and I_N between two terminals of a DC network, with explicit polarity.
Capacitors & Transients
- Capacitance Calculator (C = Q/V)Solve capacitance, charge or voltage from the other two, with stored energy and signed charge/voltage.
- Parallel-Plate Capacitor CalculatorIdeal parallel-plate capacitance from area, gap and relative permittivity, with optional charge, field and energy.
- Capacitors in Series & Parallel CalculatorEquivalent capacitance of up to 8 capacitors with per-capacitor charge, voltage and energy.
- Capacitor Energy CalculatorStored energy and the remaining capacitor quantities from any sufficient pair of C, V, Q and E.
- RC Charge & Discharge CalculatorFirst-order RC response from any V0 to Vf: τ, Vc(t), i(t), Q(t), stored energy and progress.
AC & RLC
- Inductive Reactance CalculatorXL = 2πfL with the impedance jXL, its magnitude and +90° phase; f = 0 gives a short circuit.
- Capacitive Reactance CalculatorXC = 1/(2πfC) with the impedance −jXC and −90° phase; f = 0 is reported as an open circuit, never infinity.
- Series RLC Circuit CalculatorImpedance, phase and inductive/capacitive character of a series RLC circuit, with f0, Q and optional RMS current and element voltages.
- RLC Resonant Frequency Calculatorf0 = 1/(2π√LC) and ω0, with the quality factor only when R is supplied.
- RLC Transient Response CalculatorSeries RLC step or natural response from explicit Vc(0) and i(0): α, ω0, ζ, damping class, ωd, Vc(t) and i(t).
Power & Three-Phase
- Single-Phase AC Power CalculatorApparent, real and reactive power from RMS voltage, current and power factor, with phase angle and lagging/leading nature.
- Power Factor & Power Triangle CalculatorSolve the power triangle from any two of P, Q, S and |PF|; the sign of Q is never invented and inconsistent sets are refused.
- Power Factor Correction CalculatorSingle-phase shunt-capacitor correction: initial and target Q, required Qc and capacitance C; real power unchanged.
- Three-Phase Power CalculatorBalanced star/delta power: line and phase voltages and currents, P, Q and S, with consistency checks on redundant inputs.
- Star–Delta Line & Phase Relations CalculatorBalanced line/phase voltage and current relations for star and delta connections, solved independently per side.
Magnetics & Transformers
- Magnetic Circuit CalculatorLinear magnetics and ideal transformer analysis with shared SI state.
- Solenoid Inductance CalculatorLinear magnetics and ideal transformer analysis with shared SI state.
- Faraday’s Law / Induced EMF CalculatorLinear magnetics and ideal transformer analysis with shared SI state.
- Ideal Transformer CalculatorLinear magnetics and ideal transformer analysis with shared SI state.
- Reflected Impedance CalculatorLinear magnetics and ideal transformer analysis with shared SI state.