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Resistor
Ohm's Law
LED Calc
Voltage Divider
Reference
Voltage Divider Calculator
Vout = Vin × R2 / (R1 + R2)
Circuit Parameters
Input Voltage Vin (V)
R1 (top resistor, Ω)
Ω
kΩ
MΩ
R2 (bottom resistor, Ω)
Ω
kΩ
MΩ
Load Resistance RL (optional)
Ω
kΩ
MΩ
Results
Circuit Diagram
Vin
R1
10kΩ
Vout
R2
10kΩ
GND
Voltage Distribution
Common Presets
5V → 2.5V (equal)
12V → 4V (2:1)
3.3V → 1.2V (ADC)
5V → 1.16V (sensor)
9V → 1.6V