A voltage divider is one of the simplest and most common circuits in electronics. By using two resistors in series, you can drop a supply voltage to a lower level suitable for sensors, logic inputs or signal conditioning. This makes voltage dividers useful for reducing 5V logic to 3.3V inputs, scaling analog signals and many more applications.
This Voltage Divider Calculator lets you input the supply voltage along with two resistor values to instantly calculate the output voltage. It can also help you design resistor pairs to reach a specific target output if you are developing custom hardware or working on breadboard projects.
Understanding voltage dividers is important when working with microcontrollers, ADC inputs and signal interfaces. The output voltage depends on the resistor ratio rather than the absolute values, so you can adjust the resistors to achieve precise control. Lower resistance reduces noise but increases current consumption, while higher resistance saves power but may reduce accuracy with high-impedance loads.
Use this calculator for:
- Reducing 5V logic signals to 3.3V
- Scaling analog voltages for ADC inputs
- Sensor interfacing and microcontroller inputs
- Quick resistor ratio calculations
- Learning how resistor dividers work in practice
If you want, I can generate an HTML paste-ready table of common resistor pairs for standard output voltages like 3.3V and 1.8V from a 5V source.