Unloaded Voltage Divider Calculator
Calculate ideal output voltage across the lower resistor of a two-resistor divider.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Unloaded Voltage Divider Calculator
Connect the upper resistor to the input and the lower resistor to the return reference. This model assumes the output is measured without drawing load current.
The calculation
Worked example
12 V across 10,000 ohms above and 5,000 ohms below gives an unloaded output of 4 V.
Assumptions and limits
A load changes the equivalent lower resistance and the output. Component tolerances, resistor power ratings and input source resistance are excluded.
Common questions
Which inputs should I use?
Connect the upper resistor to the input and the lower resistor to the return reference. This model assumes the output is measured without drawing load current.
What does the result exclude?
A load changes the equivalent lower resistance and the output. Component tolerances, resistor power ratings and input source resistance are excluded.