Advanced Led Resistor Calculator

Serial and Paraller LED resistor calculations to run LEDs – Led Calculator

Calculation of the resistor value in series with the LED, parallel to the LED to operate the LED at high voltages. If you do not know clearly the current drawn by the LED in the LED calculation table, enter the value as 10 mA. The standard LED voltage information is given below. In general, the outer plastic covers of Ultra bright LEDs are white and transparent. The operating voltage of these LEDs is higher than the normal colors, for example, while the normal red LED is 2V, the ultra bright red LED works with 3V, generally drawing 10..20ma current.

One of the outstanding features of the LED resistance calculation tool is the calculated LED resistance value is given as full and rounded, for example, 1k-ohm is recommended for 980-ohm, the same applies to the resistance power.

RED 1.8V..2V ORANGE 1.9..2.2V YELLOW 1.9..2.2V GREEN 2V..3.1V BLUE 3V..3.7V WHITE 3V..3.4V

Single Led Series Resistor Calculation
	Supply Voltage (DC)   V Working voltage of LED   V Current drawn by the LED   ma Calculated resistor value:   Ω Calculated resistor power value:   W Recommended resistor value:   Recommended resistance power:   W
Multiple Led Series Resistor Calculation
	Supply Voltage (DC) V Working voltage of LED   V Current drawn by the LED   ma Number of LEDs Connected in Series   Calculated resistor value:   Ω Calculated resistor power value:   W Recommended resistor value:   Recommended resistance power:   W
Parallel Led Resistor Calculation
	Supply Voltage (DC)   V Working voltage of LED   V Current drawn by the LED   ma Number of Leds Connected in Parallel   Calculated resistor value:   Ω Calculated resistor power value:   W Recommended resistor value:   Recommended resistance power:   W

Even if the number of LEDs is determined in the LED calculations, the example diagram will give an idea about the resistor connection of more than one LED with different connection types for those who are new to electronics or have no experience.

In the circuit diagram, there are 4 different connection types to operate 15 LEDs with 12v. By connecting the LEDs in parallel, it will be easier with a single resistor, but with this method, the life of the LEDs will be very short because even if the brand and model of the LEDs are the same, the internal resistances are different, and you have to know the working voltage of the LED and the current it draws.

For example; You want to connect 12v and 10 leds in parallel and use it. In parallel led calculation, you entered the led current of 20ma. You will connect the operating voltage of 3v 10 leds in parallel. The result of the calculation is 45 ohms, but if the current drawn by the leds is 10ma, the resistance value is 100 ohms. If you use a low value resistor because you entered it incorrectly, the life of the leds will be even less. You will not have this problem in serial connection.