Calculate bare shaft weight, cut shaft length, or grains per inch from the other two values while keeping finished components separate.
Bare Arrow Shaft Weight Formula
For a straight, constant-GPI shaft, bare shaft weight is cut length multiplied by the manufacturer's grains-per-inch rating.
How the Calculation Works
For an algebraic solve mode, the selected target input is hidden, marked unavailable to assistive technology, disabled, cleared, and made non-required. Conditional workflows show only the values needed for that choice.
How to Use This Calculator
- Select the value or workflow you want in the Solve for menu.
- Enter only the visible source values and use the units shown beside them.
- Select Calculate and review the primary answer, supporting values, warning, and steps.
- Use Reset before starting a different bow, arrow, or round.
Worked Example
A 30-inch shaft rated at 8.000 grains per inch weighs an estimated 240.0 grains before the point, insert, nock, fletching, wrap, or other parts are installed.
Input and Result Guide
| Item | How to use it |
|---|---|
| Cut length | Measure the shaft only using the shaft maker's stated convention. |
| GPI | Use the rating for the exact model and spine. |
| Shaft weight | This is the bare shaft contribution, not finished arrow weight. |
| Components | Use Total Arrow Weight for the complete assembled build. |
| Scale check | Weigh the finished arrow when an exact operational mass is needed. |
Interpreting the Result
Use this result to compare shaft models or estimate the shaft contribution before assembly. The calculation is linear for constant-GPI shafts.
Assumptions and Limitations
Tapered and barreled shafts can vary along their length, manufacturing tolerances apply, and the Gold Tip product name does not make this formula a substitute for the exact shaft specifications.
Common Questions
Why did a field disappear after I changed Solve for?
A hidden field is either the requested output or irrelevant to the selected workflow. Enter the remaining visible source values.
Will my last successful calculation be restored?
Yes. The calculator saves enabled source values and the successful result in this browser. Reset clears that saved state.
Sources
Easton Archery, arrow GPI definition and shaft-weight guidance; exact shaft manufacturer's specifications.