The right spine is the foundation of a well-flying arrow. This calculator helps you find a practical starting range for carbon arrows – simple, understandable, and based on real-world use. It does not replace a manufacturer spine chart, but it provides a reliable guideline for recurve and compound archers.

Your Setup

Measured from the throat of the nock to the end of the shaft, without the point.
In this mode, arrow length is used as an approximation for draw length.

Result

Select your bow type and the key setup details on the left. The calculator will then suggest a practical spine range for guidance.
Important note
This calculator does not replace a manufacturer spine chart. Differences in shaft diameter, point weight, string material, and overall setup can affect the final choice.