Resources
Technical tools and resources for understanding, building, and improving consistent arrow sets.
These resources explain arrow building itself — how components, measurements, and calculations come together in a finished arrow — whether or not you use Precision Arrow Builder.
Featured Tools
Calculator
Calculate finished arrow weight from shaft GPI, cut shaft length, and installed component weights.
Calculator
Calculate front-of-center (FOC) percentage from arrow length and balance point.
Explore by goal
How total arrow weight and front-of-center are calculated, and which measurements each calculation needs.
How shafts, inserts, points, nocks, fletching, and other parts add weight and shift balance in a finished arrow.
Why nominally identical arrows still differ, and the steps from weighing components to building a matched set.
Look up measurements and terminology
Measurement conventions, datum and sign rules, and plain-language definitions of arrow-building terms.
Browse by topic
Practical arrow calculations: total arrow weight, shaft weight from GPI, and front-of-center.
Components as a system: weight contribution, measurement, and component-to-component variation.
A learning path from measured components to consistent, matched arrow sets.
Concise reference material, including Component Measurements and Terminology.
Featured technical resource
Reference
Illustrated datum and sign conventions for measuring component lengths and center-of-gravity locations the same way every time.
How the topics connect
The topics build on each other. Calculations describe a single arrow. Component knowledge explains where its weight and balance come from. Consistency work applies both across a full set, where small measured differences between components add up from arrow to arrow.
Looking for help with the app?
Resources explain arrow building. Help explains the app: installing and using Precision Arrow Builder. Start with Getting Started or browse the Tutorials.