The ultimate archery toolkit. Calculate arrow FOC, kinetic energy, momentum, and spine. Professional ballistics tools for hunters and competitive target archers.
Pre-calculated ballistics for common arrow length and bow speed combinations
For hunting, an FOC between 12% and 15% is considered ideal. High FOC (above 15%) improves arrow flight stability and increases penetration power on impact.
Kinetic energy (KE) is calculated using the formula: KE = (Weight in grains × Velocity² / 450,240). Our tool automates this to help you meet minimum hunting requirements.
Yes. A longer arrow is more flexible (effectively weaker). If you increase arrow length, you usually need a stiffer shaft (lower spine number) to maintain proper flight.