Led Resistor Calculator
Calculate the correct resistor value for your LED circuit. Input supply voltage, LED forward voltage, and LED current to get the resistor value, power dissipation, and nearest standard resistor value.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
Previous Results
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Frequently Asked Questions
It calculates the resistor value needed to limit current through an LED to prevent damage.
Enter the source voltage, LED forward voltage (typically 2V for red, 3V for blue/white), and desired current (usually 20mA). Click calculate.
Standard values are from the E12 series (e.g., 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82 ohms and multiples). The calculator picks the nearest.