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As the title states. There are plenty out there that tell you how to measure an arrow you currently have built. I need one that I can put all of my own numbers into to get an idea of a variety of arrows and their FOC.
 

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#1. Multiply shaft grains/inch by finished arrow length - nock groove to other end of carbon.

#2. Multiply shaft grains/inch by the distance from nock groove to end of carbon at nock end. change to negative number.
Add weight of bushing, nock, fletch to the negative number above. this your net weight of nock, bushing, and fletch.

#3. Add #1 + #2 + point weight.

#4. Subtract #2 from PW, then divide that in half, then divide that by total arrow weight (#3).

This result is your FOC.
 

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If you have a smartphone, do a search for "archery tool" app. The one I've downloaded has KE and foc calcs along with paper tuning tips and a glossary.
 
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