How to use this calculator
- Enter the input voltage.
- Enter the upper resistor R1 and lower resistor R2 in ohms.
- Check output voltage, divider current and power.
Example
With 12 V input and equal 10 kΩ resistors, the unloaded output is 6 V.
How it works
Calculate voltage divider output, current, and resistor power from Vin, R1 and R2. Inputs are calculated directly in your browser and the result updates whenever a value changes.
Frequently asked questions
Does this include load resistance?
No. This is the ideal unloaded divider. A connected load in parallel with R2 will lower the output.
Which resistor is R1?
R1 is connected from Vin to Vout. R2 is connected from Vout to ground.