Voltage Divider Calculator
Find Vout for any R1/R2 combination, or solve backwards for a target output voltage.
Vout
3.837 V
Current
816 µA
R1 / R2 power
6.66 mW / 3.13 mW
Frequently Asked Questions
What is a voltage divider?+
Two resistors in series connected to a supply voltage. The output is tapped between them: Vout = Vin × R2 / (R1 + R2).
When should I use a voltage divider?+
Common uses: level-shifting a 5 V signal to 3.3 V for a microcontroller pin, biasing a transistor, or creating a reference voltage. Avoid high-current loads — use a dedicated regulator instead.