Bowjackson measures to the tip of the point. The archer's program I have been told measures to the tip of the arrow shaft.

You can do the mathematics without either, and calculate both methods.

First, measure from the nock seat to the shaft tip. Next, balance the arrow on a pencil, and mark the balance point (with the tip on). Now measure from the nock to the balance point. Divide the balance distance by the overall length, subtract 0.5 and multiply by 100. This will give you the FOC %. To change the calculations, simply measure the entire arrow to the broadhead/fieldpoint tip.

By not measuring the entire tip (broadhead or fieldpoint), you obviously will increase the FOC. The reason for not measuring the point is due to the relationship between spine and FOC. The weight of the nose affects spine---hence a fieldpoint and a Zwickey might both weigh 145 grains, but they are very different in length. However, the arrow's FOC balance point will still be the same, as the nose weight is kept constant (at least in physical theory---in actuality, there may be very minor discrepancies---like 1/16 of an inch).

The general rule of thumb is target FOC = 8-12%, hunting FOC 11-15%---a happy medium is anywhere from 10-12 %. The higher FOC, as indicated earlier, will result in loss of trajectory as yardage increases. However, a higher FOC will also result in increased penetration and KE at shorter distances, where most hunting shots are taken.

S&R

PS> There's also an article on this in the October Peterson's Bowhunting magazine.