Voltage Divider Calculator

Calculate the output voltage, current, and power dissipation of a resistor voltage divider.

Volts
Ohms (Ω)
Ohms (Ω)

Results

Output Voltage (Vout)
—
Vout = Vin × R2 / (R1+R2)
Divider Current
—
I = Vin / (R1+R2)
Power in R1
—
P₁ = I² × R1
Power in R2
—
P₂ = I² × R2
R2 / (R1+R2) Ratio
—
Voltage division factor
Total Resistance
—
R1 + R2

Circuit Diagram

Vin R1 Vout R2 GND GND + −

Formulas Used

Vout = Vin × R2 / (R1 + R2)
I = Vin / (R1 + R2)
P₁ = I² × R1 (power dissipated by R1)
P₂ = I² × R2 (power dissipated by R2)
Ratio = R2 / (R1 + R2)