Ohm's law, power, resistors, capacitors, circuit calculators, and more
Calculate voltage, current, resistance, and power
Calculate watts, amps, volts, and ohms
Decode resistor color bands to resistance value
Calculate resistor needed for an LED circuit
Calculate output voltage of a resistor divider
Capacitance in series and parallel
Inductance in series and parallel
Calculate RC circuit time constant and charging
AWG wire size, resistance, and current capacity
Calculate electricity cost from watts and hours
Estimate battery runtime from capacity and load
Calculate transformer turns ratio and voltages
Convert between dBm and watts/milliwatts
Calculate PCB trace width for current carrying
Convert between frequency and wavelength