Voltage divider calculator
Get the output voltage of a two-resistor divider, the current through it and the dissipated power.
V
Ω
Ω
- Output voltage
- 3.333 V
- Ratio
- 0.667
- Current
- 166.7 µA
- Total power
- 833.3 µW
Formula
Vout = Vin × R2 / (R1 + R2)
Handy to shift a 5 V signal down to 3.3 V, or to measure a battery with an analog input. Never use it to power a module: the voltage sags as soon as current is drawn.
Check your result in a real circuit
Wire the circuit in the Circuitly simulator and measure voltage and current with the multimeter — free, no account.
Open the simulator