Voltage Divider Calculator

A voltage divider is a simple circuit that uses two resistors in series to create an output voltage (Vout) that is a fraction of the input voltage (Vin). It's one of the most fundamental circuits in electronics.

• Level shifting for sensors and microcontrollers
• Reference voltage generation
• Biasing in amplifier circuits
• Battery level monitoring
• Signal attenuation

1. Enter your input voltage (Vin)
2. Enter your desired output voltage (Vout)
3. Optionally, specify a target current for power considerations
4. The calculator will show you the best standard resistor combinations

• The output voltage must always be less than the input voltage
• Lower current means higher resistance and lower power consumption
• Higher current provides better stability but increases power consumption
• Consider resistor tolerance in sensitive applications
• For varying loads, consider using a voltage regulator instead

The voltage divider formula is:

Vout = Vin × (R2 / (R1 + R2))

Where:

• Vout = Output voltage
• Vin = Input voltage
• R1 = Upper resistor
• R2 = Lower resistor