This is a calculator for LED’s which will give the proper resistor values, draw a schematic and calculates total device current requirements for single, parallel and parallel/series multiple LED configurations !
All you need to know is your LED specs (fwd voltage and max current in m/amps), supply voltage and number of LEDs you wish to use.
Go to http://led.linear1.org/led.wiz
I hope you find this usefull - - I sure have !