Voltage Divider Calculator

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Calculates the output voltage from a simple circuit that divides a source voltage across two resistors.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Source Voltage (V), Resistor 1 (Ω), and Resistor 2 (Ω) in the units shown.

Step 2

Read Output Voltage (V) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Source Voltage (V): 12; Resistor 1 (Ω): 1,000; Resistor 2 (Ω): 2,000

Output Voltage (V): 8

Source Voltage (V): 5; Resistor 1 (Ω): 220; Resistor 2 (Ω): 330

Output Voltage (V): 3

Source Voltage (V): 9; Resistor 1 (Ω): 4,700; Resistor 2 (Ω): 10,000

Output Voltage (V): 6.12244898

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