Electronics Calculators.

Voltage divider

Enter 2–10 resistors, from input voltage at the top down to ground. No output load is included.

Divider results

Voltages at every node

Current divider

Distribute a total supplied current among 2–10 parallel resistor branches or calculate branch currents from supply voltage.

Branch currents

Current in each branch

Capacitor networks

Compare equivalent capacitance in series and parallel. Positive ideal capacitors only; no parasitics or voltage ratings included.

Equivalent capacitance

Inductor networks

Calculate series and parallel inductance of ideal, uncoupled inductors. Mutual coupling and winding resistance are not included.

Equivalent inductance

LED series resistor

For a single LED on a DC supply.

Resistor requirement

Select a suitable standard value and resistor power rating with adequate margin. Always verify LED maximum current.

Ohm's law

Current & power