Sam Gorman

Find inductive reactance, inductance, or frequency, with unit conversion and optional real-coil current checks.

Calculate ideal capacitive reactance from capacitance and frequency, or find the capacitance or frequency for a target reactance.

Decode 3-digit, 4-digit, R notation, and EIA-96 SMD resistor codes, or create an exact supported marking.

Decode 4-, 5-, and 6-band resistor colors into resistance, tolerance range, temperature coefficient, and direction check.

Split total current across 2 to 10 parallel resistors. Get branch currents, percent share, voltage, power, tolerance range, and checks.

Estimate annual and monthly standby electricity cost from watts and your electricity rate. Check optional cutoff-plan savings and payback.

Find RC high-pass cutoff frequency, resistor, or capacitor, then check gain, phase, reactance, and loading effects.

Find ideal RC low-pass cutoff, resistor, or capacitor values. Check time constant, tolerance range, gain, and phase.

Calculate equivalent capacitance for capacitors in series, plus optional ideal voltage shares and voltage-rating checks.

Enter capacitor values in pF, nF, uF, mF, or F to calculate the equivalent capacitance of a parallel group.