Arrow Spine Calculator
Draw Weight (lbs)
Enter a value between 10 and 100.
Arrow Length (inches)
Enter a value between 20 and 36.
Point Weight (grains)
Enter a value between 50 and 300.
Calculate Spine
Recommended Arrow Spine
Formula:
Spine = (DrawWeight × ArrowLength) / PointWeight. Approximate spine value (higher number = weaker spine).