Calculate arrow front of center (FOC) using official Gold Tip shaft GPI presets — Hunter, Velocity, Kinetic, Pierce, and more. Includes a Gold Tip spine chart quick-reference and comparison against other brand calculators.
Pick your Gold Tip shaft and enter the build details. FOC calculates using the ATA/AMO formula.
FOC% = ((A − L/2) ÷ L) × 100
A = distance from nock throat to balance point; L = total shaft length. This calculator estimates A from component masses distributed along the arrow.
Grains per inch (GPI) is the single biggest factor in your arrow's weight and FOC. Here is a quick reference for the current Gold Tip lineup.
| Model | GPI | Common Spine Range | Typical Use |
|---|---|---|---|
| Gold Tip Hunter | 7.3 | 340–500 | All-around hunting |
| Gold Tip Hunter Pro | 8.2 | 300–500 | Heavier hunting setups |
| Gold Tip Velocity | 6.3 | 300–500 | Flat trajectory 3D / target |
| Gold Tip Velocity Pro | 7.9 | 300–500 | Target with weight margin |
| Gold Tip Kinetic Pierce | 8.5 | 250–400 | Penetration hunting |
| Gold Tip Kinetic Kaos | 9.3 | 200–400 | Heavy hunting / EFOC |
| Gold Tip Kinetic XT | 10.6 | 200–340 | Extreme penetration builds |
Source: Gold Tip official shaft specification charts. Verified for the 2024–2025 product line.
FOC formulas are universal — every properly built FOC calculator uses the same ATA/AMO equation. If your result differs from another calculator (Gold Tip, Podium Archer, Ranch Fairy, Easton), the difference comes from one of these three sources:
For a fair comparison, always use the same measured A and L values in every tool.
Higher GPI shafts (Kinetic XT at 10.6 gpi, Kinetic Kaos at 9.3 gpi) combined with heavy inserts (50–100 gr) and 125–200 gr points produce the highest FOC. Kinetic series is popular for EFOC hunting builds.
Yes. All legitimate FOC calculators use the ATA/AMO formula: FOC% = ((A − L/2) ÷ L) × 100. If you get a different result elsewhere, the difference is in the input measurements, not the formula.
For a 70 lb compound at 29 in draw with a 125 gr point, most shooters land in the 300–340 spine Gold Tip Velocity or Hunter. Use our arrow spine calculator first, then cross-check against Gold Tip's published spine chart.
Factory aluminum inserts typically run 12–15 grains. Brass aftermarket inserts run 50–100 grains and dramatically raise FOC without changing arrow diameter.
Yes — all current Gold Tip shaft models are available in the dropdown. If your shaft is discontinued, choose "Custom GPI" and enter your shaft's GPI manually.