If using the calculator PLEASE down load the directions..
I copied this from them
Important:
If using a longer insert than a std RPS insert, like the popular 100 gr brass insert, remember to set the “Footing” option to yes and enter the additional insert length there. The HIT inserts also fall into this category and are very long for their weight. Remember to include the depth set into the
shaft also!
Footing
If an internal OR external footing is being utilized then select "YES" from the drop down menu.
In the boxes below enter the length of the footing in inches and also the total weight of the
footing.
- An example of an internal footing would be any insert with a length greater than 0.9"
(std. insert length) or the extends into the shaft more than 0.9” An example is the HIT
insert as shown in the diagram below.
- An example of an external footing would include be an aluminum shaft glued over the
outside of a carbon shaft. In the case of an external footing enter the total length of the
footing minus 0.9” as indicated by X.XX” in the diagram below.
The diagram below shows the correct interpretation of a standard insert, an internal footing, and an external footing.
6 Nock End Weight
Enter the total weight of the nock and/or nock insert. If an arrow crown wrap is being used then it
weight should also be added.
Ex: A 11/32" Bohning Classic Nock weighs 13.5 grains. A CE Nock weighs 9.8 grains.
A wrap typically runs between 6 to 15 grains.