General Electronics Calculators

Ohm's Law

Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to solve for the remaining two quantities.

Color Code

Decode resistor color bands to resistance value and tolerance. Supports 4-band, 5-band, and 6-band resistors. Instant color band to ohms conversion.

RC Time Constant

Calculate RC circuit time constant τ, charge time to 63.2% and 99%, and −3dB cutoff frequency. Essential for filter and timing circuit design.

Series/Parallel R·C·L

Calculate the equivalent series and parallel combination of up to four resistors, capacitors, or inductors. Also computes the voltage divider ratio for two-resistor networks.

LC Resonance

Calculate the resonant frequency, characteristic impedance, Q factor, and bandwidth of a series or parallel LC tank circuit. Enter inductance, capacitance, and optional series resistance.

Op-Amp Gain

Calculate op-amp voltage gain, gain in dB, −3 dB bandwidth, and input impedance for inverting, non-inverting, and differential amplifier configurations.

Wire Gauge

Convert between AWG and mm², calculate wire current capacity, resistance, and voltage drop

Capacitor Energy

Calculate energy stored, charge, and current in capacitors for power supply design

Zener Diode

Calculate series resistor, power dissipation, and load current for zener diode voltage regulators

Inductor Energy

Calculate energy stored in an inductor, L/R time constant, and current rise time

BJT Bias Point

Calculate BJT voltage divider bias Q-point including collector current, base voltage, VCE, power dissipation, and operating region

MOSFET Operating Point

Calculate MOSFET drain current, saturation voltage, transconductance, and operating region (cutoff, triode, saturation) for NMOS transistors

Comparator Hysteresis

Calculate comparator hysteresis trip points for Schmitt trigger circuits, upper and lower threshold voltages, and design resistor values for a desired hysteresis percentage

555 Timer

Calculate 555 timer frequency, period, duty cycle, and pulse width for both astable oscillator and monostable one-shot configurations

Transistor Switch

Calculate BJT transistor switch parameters including load current, required base current, base resistor value, saturation check, and power dissipation

Current Mirror

Calculate current mirror output current, beta error, reference resistor, power consumption, and Widlar mirror resistor for analog IC and bias circuit design