▷| Diode Bias Calculator

Forward bias current, voltage drop, and power dissipation

Diode Presets

Silicon
Vf ≈ 0.7V

Germanium
Vf ≈ 0.3V

Schottky
Vf ≈ 0.2V

LED Red
Vf ≈ 2.0V

Supply Voltage (Vs)

Forward Voltage (Vf)

Series Resistor (R)

Temperature (°C)
affects Vf

Forward Current

—

Power (Diode)

—

Power (Resistor)

—

Adj. Vf @ Temp

—

If = (Vs − Vf) / R

P_diode = Vf × If | P_resistor = If² × R

Vf temp correction: −2 mV/°C from 25°C baseline

Actual Vf varies with current and temperature. The Shockley equation gives exact I-V characteristics.