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Use this tool to calculate the resistance required to drive one or more series-connected LEDs from a voltage source at a specified current level.
With this online tool, you can easily calculate the current-limiting resistor for one or more LEDs, both in series and in parallel. Simply input the number of LEDs, the supply voltage, LED forward voltage, and LED current.
3 Οκτ 2024 · Calculation Formula. The LED resistor value is determined using Ohm's law, with the formula: \ [ R = \frac {V_s - V_l} {I_L} \] where: \ (R\) is the resistance (in ohms, Ω), \ (V_s\) is the voltage of the source (in volts, V), \ (V_l\) is the voltage drop across the LED (in volts, V), \ (I_L\) is the current through the LED (in amperes, A).
Calculate resistor values for LEDs using this simple calculator. Enter any three known values and press Calculate to solve for the others.
This calculator will help you determine the value of the resistor to add in series with the LEDs to limit the current. Just input the indicated values and press the "Calculate" button. As a bonus, it will also calculate the power consumed by each LED.
Calculator and formulas for calculating the LED series resistor.
Find the resistor needed to add an LED to an electrical circuit with an easy calculator, plus see the formula to calculate the resistor with examples.
