how many inches do you add to your draw length (middle of nock to far end of shelf) for the length of the arrow?  Example: 27" draw so a 28" arrow....

Keep in mind that you will need about an inch taper for the field point or broadhead.  I usually add about another inch for clearance from the back of the point to the back of the riser.  Thus, for a 27-inch draw, I would be cutting the shafts to about 29 inches.  A plastic nock will add about 1/8 inch to the tapered nock end of the arrow.

Add one inch....  If you draw 27" you shoot a 28" arrow. You can also measure by drawing back with a extra long arrow, and have someone mark the arrow on inch past the shelf.

rappstar

I personally go an inch and a half over.  On wood, remember to cut the shaft another 1" longer since the taper for the point requires it.  So for your example 27" draw, I would start with a 29.5" shaft.

I thought you were talking about the length of a finished arrow..  What Orion said is correct.....

thanks guys!

I shoot 29" cedars for my 26" draw. I like the extra length for the reduced spine since I shoot mostly self bows.   Pat

Pat:
Then why not just order weaker spines instead of having 3" of arrow hanging out?
Bob

I like the extra weight on the arrows and I don't mind if 3" is sticking out. They still fly well.   Pat