LED Series Resistor Value Calculator

LED Series Resistor Calculator

Supply Voltage (V):

LED Forward Voltage (V):

LED Forward Current (mA):

Calculate Resistor

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The LED Series Resistor Calculator is a tool that assists in finding the right resistor value for connecting an LED to a power source without causing damage. This resistor serves to regulate the current flowing through the LED.

To figure out the appropriate series resistor value for an LED, you usually need to know three key things:

1. Supply voltage (V_s): This is the power source’s voltage, such as that of a battery.
2. LED forward voltage (V_f): The specific voltage drop across the LED.
3. LED forward current (I_f): The desired current to pass through the LED.

The general formula to calculate the series resistor for an LED is:

R = (V_s - V_f) / I_f

Here:

• R represents the resistance value in ohms (Ω).
• V_s stands for the supply voltage.
• V_f is the LED’s forward voltage.
• I_f denotes the LED’s forward current.