Arrow FOC, kinetic energy & speed calculator
Enter your bow setup and arrow components. Arrow Lab calculates total weight, FOC, kinetic energy, momentum, speed, penetration index, and a recommended spine.
Compound bow arrow setup is a system: spine has to match the dynamic load of your bow, point weight drives both spine and FOC, total weight trades trajectory against penetration. The lab models the system end-to-end so you can move one variable and see the rest update in real time.
Inputs: peak draw weight, draw length, IBO speed, finished arrow length, shaft GPI, point weight, insert weight, nock weight, fletching weight, and target use case (target, 3D, hunting). Outputs: estimated fps, FOC%, kinetic energy in ft-lb, momentum in slug-fps, penetration index, and a manufacturer-chart-style spine recommendation with adjustment notes.