LED Series Resistor Calculator

Calculate the required series resistor for LED circuits using Ohm's Law to ensure proper current limiting

Inputs

Supply Voltage (Vs)

Voltage Drop (Vd)

Forward Current (If)

Resistance (R)

0Ohms (Ω)

Power Dissipation (P)

0Watts (W)

Resistance

R = \frac{V_s - V_d}{I_f}

Power Dissipation

P = (V_s - V_d) \cdot I_f

Vs=Supply Voltage (Volts (V))

Vd=Voltage Drop (Volts (V))

If=Forward Current (Amperes (A))

R=Resistance (Ohms (Ω))

P=Power Dissipation (Watts (W))