LED Current Limiting Resistor Calculator

Calculate the resistor value needed for an LED circuit using:
\[ R = \frac{V_{\text{supply}} – V_{\text{LED}}}{I_{\text{LED}}} \]

* Enter the supply voltage (V), LED forward voltage (V), and LED current (mA).

Step 1: Enter Circuit Parameters

Supply Voltage, \( V_{\text{supply}} \) (V):

Example: 9 V battery

LED Forward Voltage, \( V_{\text{LED}} \) (V):

Example: 2 V for a red LED

LED Current, \( I_{\text{LED}} \) (mA):

Example: 20 mA

Calculated Resistor Parameters