Voltage Divider Calculator

Voltage Divider

Calculate Vout from Vin, R1, and R2. Shows divider current and resistor power.

Vin (V) R1 (Ω) — top R2 (Ω) — bottom Load (Ω) — optional

Notes: R1 is between Vin and Vout, R2 is between Vout and GND. Load is treated as parallel with R2.

Vout —

Divider current —

Power (R1) —

Power (R2) —

Power (Load) —

Effective bottom resistance —

Ratio (Vout/Vin) —

If you provide a Load value, the output voltage drops depending on the parallel resistance.

A load forms a parallel network with R2, changing equivalent resistance and lowering output voltage.

Balance low current consumption and noise sensitivity. Very high resistances can be more noise-prone.