Voltage divider calculator

Voltage Divider Calculator

Pick a mode, enter only what’s needed. Compare your result with the nearest standard (E12/E24).

Mode

Input voltage (Vin)

Target output (Vout target)

R1 (top resistor)

R2 (bottom resistor)

Invalid input. Ensure 0 < Vout < Vin when solving, and R1,R2 > 0. Check units.

Precision:

Vout (ideal)

Divider current (no load)

Solved R1 (ideal)

Solved R2 (ideal)

Nearest standard series

R1 (nearest standard)

R2 (nearest standard)

Divider current (rounded)

Vout (rounded)

Error vs target/ideal

Vout = Vin · R2 / (R1 + R2)