Voltage Calculator

Voltage Calculator is a fast, focused toolbox for everyday electronics work. Three calculators in one clean, dark interface give you instant answers while you type.

KEY FEATURES • Series & parallel calculator: combine up to 15 resistors or capacitors and read the result in every common unit • LED series resistor: enter supply voltage, forward voltage and forward current to get the right resistor and its power rating • Built-in reference table of typical LED forward voltages • Voltage divider: calculate the output voltage, or find the missing resistor for a target output • Live circuit diagrams that show your values in place • Results update instantly in multiple units as you type • Available in 24 languages