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LED resistor calculator

LED resistor value calculation

LED TYPE LED COLOUR NUMBER OF LEDs
IN SERIES
SUPPLY VOLTAGE RESISTOR VALUE
Standard
Superbright
Ultrabright
Red,Yellow,Amber, Green
White OR Blue

Nominal battery voltages are :

NIMH
6x NIMH = 7.2 volts
7x NIMH = 8.4 volts
10x NIMH = 12 volts
12x NIMH = 14.4 volts

LIPO
1 cell = 3.7 volts
2 cell = 7.4 volts
3 cell = 11.1 volts
4 cell = 14.8 volts

Standard resistor values E12 Series (5%):

These are the standard available resistor valuse. Choose the higher value closest to the value calculated above.
47 , 56, 68, 82, 100, 120, 150, 180, 220, 270, 330, 390, 470, 560, 680, 820, 1000 ohms

LED Connections


Do not connect without an appropriate resistor. The resistor may go either side of the diode.

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