Voltage Divider Calculator

Calculate voltage divider circuits with our advanced calculator. Find resistor values, input/output voltages, and more.

Voltage Divider Formula:

V_out = V_in × R₂ / (R₁ + R₂)

Vin = 5V

Vin = 12V

R1 = 10kΩ, R2 = 10kΩ

R1 = 4.7kΩ, R2 = 10kΩ

Voltage Input (V_in):

Voltage Output (V_out):

1st Resistance (R₁):

2nd Resistance (R₂):

Enter any three values and click Calculate.

Note: The circuit diagram updates automatically as you enter values.

Auto-calculate as you type

Standard Resistor Finder

Input Voltage (V_in):

Desired Output Voltage (V_out):

Resistor Series:

Enter input and output voltages to find standard resistors.

R1	R2	Actual Vout	Error (%)

Input Voltage (V_in):

Resistor 1 (R₁):

Resistor 2 (R₂):

Load Resistance (R_L):

Enter values to calculate power dissipation.

Given: V_in=12V, R₁=6.8kΩ, R₂=4.7kΩ

Given: V_in=5V, R₁=350Ω, R₂=350Ω

Given: V_in=5V, R₁=2kΩ, R₂=3kΩ