FluxBench

Resistor Divider Calculator

v1.0 calculator

Calculate voltage divider circuits with automatic solving

Resistor Divider
Enter values. Auto solves when possible. Or choose what to solve.
Formula: -
Computed: -
Current used by resistors (A): -
R1 heat (W): -
R2 heat (W): -
Divider current is the current that continuously flows through R1 and R2. This current is burned as heat in the resistors.

Resistor Divider Calculator

Calculate Voltage divider circuits with automatic solving. Enter values and the calculator will solve for the missing parameter.

How to use

Enter any combination of:

The calculator automatically solves for the missing value when possible.

Examples

3.3V from 5V

  • Input: 5V
  • Output: 3.3V
  • R1: 1kΩ
  • R2: ~1.94kΩ (use 2kΩ standard)

Reference Voltage

  • Input: 12V
  • Output: 2.5V
  • R1: 10kΩ
  • R2: ~2.63kΩ (use 2.7kΩ standard)

FAQ

Q: What is a Voltage divider? A: A circuit using two Resistors to create a lower Voltage from a higher one. Vout = Vin × (R2 / (R1 + R2)).

Q: Can I use this for power? A: Voltage dividers are inefficient for power applications due to Power dissipation in the Resistors. Use a regulator instead.