Electronics
Electronics calculators
Circuit design helpers for voltage, current, impedance, and component sizing.
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21
Calculators built for electronics scenarios.
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21 calculators match your filter.
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555 Timer Astable Frequency Calculator
Finds output frequency and duty cycle for a 555 timer in astable mode.
Battery Life Calculator
Estimates runtime from battery capacity, load current, and discharge depth.
Capacitance Calculator
Computes capacitance for parallel plate capacitors.
Current Divider Calculator
Splits current through resistors in a parallel branch.
dB Converter
Converts linear power or voltage ratios to decibels and back.
Electrical Power (P = VI)
Calculates real, apparent, and reactive power for single- or three-phase systems.
Inductance Calculator
Estimates inductance for air-core and ferrite-core coils.
LED Series Resistor Calculator
Finds the current-limiting resistor for LEDs on a fixed supply voltage.
Ohm’s Law Calculator
Solves for voltage, current, or resistance in DC circuits.
PCB Trace Width Calculator
Finds the minimum copper trace width for a target current using IPC-2221.
Power Factor Calculator
Computes real, reactive, and apparent power with power factor.
RC Time Constant
Finds τ = R·C plus the time to hit 63%, 95%, and 99% charge levels.
Reactance Calculator
Computes capacitive and inductive reactance, or LC resonant frequency.
Resistor Color Code Calculator
Decodes resistor band colors into resistance and tolerance.
RMS Voltage & Current Calculator
Converts a peak sine, square, or triangle waveform value to RMS and average.
Series/Parallel Resistors
Equivalent resistance calculator plus branch count at a glance.
Transformer Turns Ratio Calculator
Finds secondary voltage and current from a transformer's turns ratio.
Voltage Divider Calculator
Computes output voltage for resistor dividers with load awareness.
Wheatstone Bridge Calculator
Solves for an unknown resistor at balance or the output voltage of a resistor bridge.
Wire Gauge & Voltage Drop Calculator
Estimates voltage drop across AWG wire sizes and recommends a gauge for your run.
Zener Diode Series Resistor Calculator
Sizes the series resistor for a Zener diode voltage regulator.