LED Calculator

Find the right current-limiting resistor for your LED

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Common LED Forward Voltages

ColorVf (typical)If (typical)Wavelength
πŸ”΄ Red1.8 – 2.2 V20 mA620–750 nm
🟠 Orange2.0 – 2.2 V20 mA590–620 nm
🟑 Yellow2.0 – 2.2 V20 mA570–590 nm
🟒 Green2.0 – 3.5 V20 mA495–570 nm
πŸ”΅ Blue2.5 – 3.7 V20 mA450–495 nm
βšͺ White2.8 – 4.0 V20 mAbroadband
🟣 UV3.0 – 4.0 V20 mA<400 nm
πŸ’‘ IR1.2 – 1.8 V50–100 mA>700 nm