Kinetic Energy and Momentum Calculator

Enter the arrow weight in grains:

Enter the arrow speed in fps:

Momentum =

Kinetic Energy =


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FOC Calculator

See Arrow FOC (Front of Center) Basics and How to Calculate It for more details on front of center.

AMO Method:

1) Measure the length of the shaft from the throat of the nock to the end of the shaft, excluding the insert, this is L

2) Using a sharp edge, balance the arrow (including the point) and mark the balance point

3) Measure the distance from the throat of the nock to the balance point, this is B


The second method replaces the total length of the arrow, including the point, for the (L) value.

Enter the total length "L":

Enter the measured length "B":

FOC = %