Voltage Divider Calculator
Find the output of a voltage divider.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator applies the voltage divider formula, Vout = Vin × (R2 / (R1 + R2)), to find the output voltage across the second resistor in a two-resistor series circuit fed by an input voltage.
Electronics hobbyists and engineers use voltage dividers constantly to step down a voltage for a sensor or microcontroller input, to bias a transistor, or to scale a signal before feeding it into an analog-to-digital converter. The calculator assumes an ideal, unloaded divider (no current drawn at the output), which is the standard simplification taught in intro electronics — real circuits with a loaded output need a modified formula that accounts for the load resistance.
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