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Voltage Divider Calculator

Output voltage of a two-resistor divider, the current it draws, and R2 for a target output.

Enter values

Results update as you type.

Result

Output voltage

3.8367 V

Divider current
0.8163 mA
Power in R1
6.664 mW
Power in R2
3.132 mW
Output impedance
3,197.3 Ω

About the Voltage Divider Calculator

Output voltage of a two-resistor divider, the current it draws, and R2 for a target output.

Also known as: potential divider, resistor divider, vout calculator, divide voltage.

How to use this calculator

  1. Enter calculate, input voltage, r1 (top) and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

V_out = V_in × R₂ / (R₁ + R₂)

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Output voltage
  • Input voltage = 12 V
  • R1 (top) = 10,000 Ω
  • R2 (bottom) = 4,700 Ω

the calculator returns:

  • Output voltage: 3.8367 V
  • Divider current: 0.8163 mA
  • Power in R1: 6.664 mW
  • Power in R2: 3.132 mW

Tips & common mistakes

  • A divider only holds its output if the load draws far less current than the divider itself.