Led Calculator

LED Calculator - Current limiting resistor calculator for LED arrays

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This LED calculator will help you design your LED array and choose the best current limiting resistors values. To get started, input the required fields below and hit the "Design Circuit" button.
Power supply voltage (V):  Help
LED voltage drop (V):  Help
LED current rating (mA):  Help
Number of LEDs:  Help
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  • You will need 12 x 3 ohm 2 watt resistors.
  • The 3 ohm resistor is color coded: Orange, Black, Gold, Gold.
  • Each 3 ohm resistor consumes 1470 milliwatt.
  • Total power consumed by the resistors is 17640 milliwatt.
  • Total power consumed by the LEDs is 83160 milliwatt.
  • Total power consumed by the circuit is 100.8 watt.
  • Total current drawn by the circuit is 8400 milliampere.
  • The resistor values are calculated based on the common ±5% tolerance resistors.
  • Make sure to wire the LEDs in the correct direction as shown below.
  • Always leave some space for the resistors to breathe. They might get hot.

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