I have used Stu’s calculator often and for arrow weights and estimating FOC it seems to work OK. However, I plugged in my (wood) arrow numbers and came up with an estimated FOC which was 2-3% short compared to using actual BOP length (L), balance-point measurement from nock valley to balance point (P) and running the ((B/L)-0.50)*100 equation to calculate actual FOC percentage. The calculator comes up with an estimated FOC in the mid-15% Range but the actual FOC equation yields an FOC in the high 18’s.
