You can download Archers Advantage for $39.99 last I checked. Then you can get arrow recommendations, sight pin settings, FOC, cut charts, over/under charts... It's a bargain in my book! But if all you want is FOC the GoldTip program is plenty accurate for calculating FOC.
Forget the KE calculator. It doesn't mean very much when you are dealing with hunting arrows. It's good for calculating how much thump you are going to give a rabbit with an Bludgeon, but beyond that is a rather worthless tool once you screw on a broadhead.