Calculate the correct series resistor needed to safely power light-emitting diodes. Input supply voltage, LED voltage drop, current, and the number of LEDs to find the required resistor value and wattage.
4.8(8 ratings)
$2.99
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Resistance Color Calculator by Fabian Schiller
Strong Contender
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4.9(125 ratings)
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Easily determine the resistance value of electronic components. Simply select the number of color bands on your resistor and input the colors one by one to instantly get the resistance and tolerance. This tool simplifies a common electronics task.
Resistor Code Calculator by Vivid Planet Software
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3.6(27 ratings)
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Easily determine the resistance value of electronic components using their color bands. This reference tool supports both 4 and 5-band resistors, making it ideal for makers, engineers, and students working with electronics projects.
