One problem per tool
Each page answers a specific electronics design question rather than behaving like a generic equation solver.
Engineering tools
Electronics calculators built around real design tasks
Fast browser-based tools for component values, timing, filters, analogue circuits and everyday power calculations. Each calculator keeps the formula, assumptions and engineering context beside the result.
20calculators
Fundamentals
Ohm’s Law
Calculate voltage, current or resistance from the other two values, with power shown automatically.
Open calculatorFundamentals
Voltage Divider
Solve an unloaded two-resistor divider for output voltage, input voltage, or either resistor.
Open calculatorFundamentals
LED Series Resistor
Calculate the series resistor, supply voltage, LED forward voltage or LED current for a single LED.
Open calculatorFundamentals
Resistor Network
Combine any number of resistor values in series or parallel and find the equivalent resistance.
Open calculatorFundamentals
Capacitor Network
Combine any number of capacitors in series or parallel and find the equivalent capacitance.
Open calculatorTiming & Filters
RC Time Constant
Solve the RC time constant, resistance or capacitance and see useful 3τ and 5τ settling times.
Open calculatorTiming & Filters
RC Low-Pass Filter
Calculate the -3 dB cutoff frequency, resistance or capacitance for a first-order RC low-pass filter.
Open calculatorTiming & Filters
RC High-Pass Filter
Calculate the -3 dB cutoff frequency, resistance or capacitance for a first-order RC high-pass filter.
Open calculatorTiming & Filters
Capacitive Reactance
Solve capacitor reactance, frequency or capacitance for sinusoidal AC analysis.
Open calculatorTiming & Filters
Inductive Reactance
Solve inductor reactance, frequency or inductance for sinusoidal AC analysis.
Open calculatorTiming & Filters
LC Resonance
Calculate resonant frequency, inductance or capacitance for an ideal LC resonant circuit.
Open calculatorTiming & Filters
555 Astable
Solve frequency, R1, R2 or timing capacitance for the conventional 555 astable oscillator.
Open calculatorTiming & Filters
555 Monostable
Solve pulse width, timing resistance or timing capacitance for a 555 monostable one-shot.
Open calculatorAnalogue
Non-Inverting Op-Amp
Solve ideal closed-loop gain or either feedback resistor for a non-inverting op-amp stage.
Open calculatorAnalogue
Inverting Op-Amp
Solve gain magnitude, feedback resistance or input resistance for a standard inverting op-amp stage.
Open calculatorAnalogue
Sine RMS / Peak
Convert a symmetrical sine wave between RMS, peak and peak-to-peak voltage.
Open calculatorDigital & Power
ADC Resolution & Code
Calculate ideal ADC volts-per-LSB, digital code from an input voltage, or nominal voltage from a code.
Open calculatorDigital & Power
BJT Base Resistor
Estimate a base resistor for using an NPN BJT as a switch from drive voltage, load current and forced beta.
Open calculatorDigital & Power
Zener Series Resistor
Size a series resistor for a simple Zener shunt regulator from input voltage, load current and desired Zener current.
Open calculatorDigital & Power
Linear Regulator Thermal
Estimate linear-regulator dissipation, ideal efficiency and the maximum total junction-to-ambient thermal resistance.
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Try a broader search or choose another category.
Engineering units built in
Work naturally in mA, kΩ, nF, µH, kHz and other practical units without converting everything by hand first.
Formula and assumptions visible
Results stay connected to the equation and model being used, so it is clear what the number does—and does not—represent.