🔌 Voltage Divider Calculator
Calculate voltage divider output voltage
How Voltage Divider Calculation Works
Formula
Vout = Vin × R2 / (R1 + R2)
- 1Enter the input voltage (Vin) and two resistor values (R1, R2).
- 2Output voltage is calculated as Vin × R2 / (R1 + R2).
- 3R1 is the resistor connected to Vin, R2 is connected to ground.
- 4In reverse mode, enter Vin, desired Vout, and R1 to find R2.
- 5Current through the divider is also calculated: I = Vin / (R1 + R2).
About Voltage Divider Calculator
Calculate voltage divider output. Enter Vin, R1, and R2 to find Vout. Reverse mode: find R2 given desired Vout. Shows step-by-step solution.
Frequently Asked Questions
What is a voltage divider?
A voltage divider uses two resistors in series to produce a fraction of the input voltage. The output is taken from between the two resistors. It's one of the most basic and useful circuits in electronics.
Can I power a circuit with a voltage divider?
Voltage dividers are not suitable for powering circuits that draw significant current. The output voltage drops under load. For power regulation, use a voltage regulator IC instead.
How do I choose resistor values?
Use values between 1kΩ and 100kΩ for most applications. Lower values waste power; higher values are more susceptible to noise. The ratio R2/(R1+R2) determines the output, not the absolute values.