Electrical & Electronics

Voltage Divider Calculator

Calculate divider output, current and resistor power, or solve for a missing resistor in reverse mode.

CALCULATOR

Enter values

Vin

V

Vout

V

R1

R2

USAGE

How to use it

Choose direct or reverse mode.
Enter voltages and resistances using the required units.
Account for loading as described in the technical notes.

FORMULA

Calculation

Vout = Vin × R2 / (R1 + R2)

Example

12 V with R1 = R2 = 10 kΩ gives 6 V

TECHNICAL

Technical notes

Results assume an unloaded ideal divider.
A low-impedance load appears in parallel with R2.