⚡ Voltage Divider Calculator

Calculate output voltage and divider current from any resistor pair

Inputs

Input Voltage (Vin)

R1 (Ω)

R2 (Ω)

Load Resistance (Ω)
optional

—

Output Voltage (Vout)

Divider Current

—

Power Dissipated

—

Vout / Vin Ratio

—

Voltage Drop R1

—

Vout = Vin × R2 / (R1 + R2)

Current I = Vin / (R1 + R2)

With load: R2_eff = R2 ∥ RL = (R2 × RL) / (R2 + RL)

Tip: For stable Vout, keep RL ≥ 10× R2.