Free Voltage Divider Calculator - Calculate Volt & Resistor Values

Voltage Divider Calculator

Calculate output voltage, current, and power dissipation for voltage divider circuits with precision

Circuit Parameters

Input Voltage (V_in)

Resistor 1 (R₁)

Resistor 2 (R₂)

Load Resistor (R_L) – Optional

Resistor Tolerance

Enter values and click Calculate to see results

V_out = V_in × (R₂ / (R₁ + R₂))

This is the standard voltage divider formula without load.

R_eq = (R₂ × R_L) / (R₂ + R_L)

When a load resistor is connected, R₂ and R_L form a parallel combination.

P = V × I = I² × R = V² / R

Power dissipation in each resistor can be calculated using these formulas.