Resistor voltage divider
Calculate unloaded or loaded divider output voltage.
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Resistor Voltage Divider Calculator
Calculate unloaded or loaded voltage-divider output, current and effective lower resistance.
About this calculator
How to use it
Enter input voltage, both divider resistors and an optional load resistance to calculate the output.
Understanding the result
A connected load changes the divider ratio. For stable supplies or significant current, use a regulator or buffer rather than a simple divider.
More ham radio calculators
Use this calculator as a practical starting point. Check critical radio, electrical and installation work with suitable test equipment and current licence requirements.