Pick your components, watch the arrow come together, and get the numbers that matter — total weight, FOC, kinetic energy and a spine match — live. Save or share your build. Runs in your browser.
FOC here is estimated from component weights and typical positions — good for comparing builds; a finished arrow measured on a balance point is exact. Spine match uses the same chart as our Spine Selector. These numbers are a starting point — always paper-tune.
Start with the shaft manufacturer’s specifications and your actual component weights. The tool updates as you change inputs; you can print a build card or copy a share link to discuss the setup with a shop or arrow builder.
Total weight is shaft GPI × length, plus point, insert, nock, fletching and wrap weights entered here. Glue, adapters or other items not represented in those entries are not automatically included. The finished arrow’s measured weight is the check on the estimate.
Estimated. This tool assumes typical component positions to estimate the balance point; actual hardware and assembly can change it. Compare builds here, then measure the finished arrow’s balance point using a consistent manufacturer-recommended method.
No. The comparison is a simplified chart-based starting point using bow type, draw weight, shaft length and point weight—not a complete dynamic-spine simulation. Insert weight contributes to total weight and estimated FOC here, but is not an input to the spine recommendation. Check the shaft manufacturer’s selection chart and work with a qualified shop to confirm suitability before purchasing, cutting or shooting.