Voltage Divider Calculator
Vout = Vin · R2/(R1+R2)
How to Use This Calculator
Enter input voltage and resistor values. The output assumes no load (infinite load resistance).
Formula
Vout = Vin · R2/(R1+R2)
If a load RL is present, replace R2 by R2‖RL.
Frequently Asked Questions
Why is my measured Vout lower?
Real loads draw current; use the loaded divider formula considering RL.
What resistor ratio gives 50%?
Choose R1 = R2 for Vout ≈ Vin/2 under no-load conditions.