Look up a traditional-bow brace-height starting range or compare a measured value with that range.
Recurve and Longbow Brace-Height Lookup
Brace height is measured from the grip pivot point to the string. Because it is design-specific, this tool returns a transparent starting range rather than claiming a universal formula.
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
For a 68-inch recurve, the lookup returns 8.75 to 9.50 inches, with a 9.125-inch midpoint. A measured 9.10 inches is within that range.
Input and Result Guide
| Item | How to use it |
|---|---|
| Bow type | Choose recurve or longbow; compound bows require their exact tune chart. |
| AMO length | Enter the marked traditional-bow length in inches. |
| Measured brace height | Measure from the grip pivot point to the string at 90 degrees. |
| Status | Below, within, or above refers only to the displayed starting range. |
| Adjustment | Use string twists only within manufacturer and string-maker limits. |
Interpreting the Result
A measurement inside the displayed range is a reasonable starting point, not proof of ideal tuning. Noise, grouping, clearance, and the maker's recommendation remain important.
Assumptions and Limitations
Range charts vary by limb and riser design. Do not apply this lookup to compounds, and do not tune outside the bow or string manufacturer's safe limits.
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
Archery Trade Association, brace-height measurement terminology; recurve and longbow manufacturer tune charts.