Voltage Divider Designer

Design voltage divider circuits. Calculate output voltage, resistor values, current, and power dissipation. Essential for analog circuit design.

Calculation Mode

Voltage Divider Designer

Input Voltage (Vin)

Resistor R1

Resistor R2

Output Voltage (Vout)

Load Resistance (Optional)

Leave empty for unloaded divider

Circuit Diagram

Vin+─────

│

R1────[Ω]────

│

Vout─────

│

R2────[Ω]────

│

GND─────

Formulas

Output Voltage (Unloaded):

Vout = Vin × (R2 / (R1 + R2))

Output Voltage (With Load):

R2_parallel = (R2 × R_load) / (R2 + R_load)

Vout = Vin × (R2_parallel / (R1 + R2_parallel))

Current:

I = Vin / (R1 + R2)

Calculate R2 from R1:

R2 = (R1 × Vout) / (Vin - Vout)

Calculate R1 from R2:

R1 = (R2 × (Vin - Vout)) / Vout

Power Dissipation:

P = I² × R = V × I

Note: For best results, choose R1 and R2 such that their parallel combination is much smaller than the load resistance (typically 10× smaller). This minimizes the effect of load on output voltage.