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Electronics
Resistors, power, and cable sizing.
Ohm's Law Calculator
Solve for voltage, current, resistance, and power.
Explore →Resistor Color Code Calculator
Decode a 4-band resistor's color code.
Explore →Voltage Divider Calculator
Find Vout and current from Vin, R1, and R2.
Explore →Resistors in Series and Parallel Calculator
Total resistance for resistors in series or parallel.
Explore →SMD Resistor Code Calculator
Decode 3-digit and 4-digit SMD resistor codes.
Explore →LED Resistor Calculator
Find the right series resistor for an LED.
Explore →Capacitor Code Calculator
Decode a 3-digit capacitor code into its capacitance.
Explore →Inductor Color Code Calculator
Decode a 3-band inductor color code into its inductance.
Explore →Wire Gauge (AWG) Calculator
Find a wire's diameter and ampacity from its AWG number.
Explore →Battery Runtime Calculator
Estimate how long a battery will last under a given load.
Explore →RC Time Constant Calculator
Find the time constant of an RC circuit.
Explore →Reactance Calculator
Find capacitive and inductive reactance at a given frequency.
Explore →Decibel Calculator
Convert a power or voltage ratio into decibels.
Explore →Transformer Turns Ratio Calculator
Find a transformer's turns ratio and secondary voltage.
Explore →