Find the recommended brace height range for your bow length and see how it affects performance.
Brace height is the perpendicular distance from the string at rest to the deepest point of the grip. Enter your bow's overall length in inches (the AMO length for a recurve) and your current measured brace height.
The recommended window centers on 12.71% of bow length and extends 0.625 inches to either side — a 1.25-inch band. For a 68-inch recurve that puts the midpoint near 8.6 inches with a working range of roughly 8.0 to 9.3 inches; a 70-inch bow centers around 8.9 inches.
Your current setting is rated as below, inside, or above that window. Brace height is normally adjusted by twisting or untwisting the string a few turns at a time. Treat the manufacturer's printed specification as the authority when it differs from the generic 12.71% rule used here.
The recommendation centers on 12.71% of bow length, so a 68-inch bow gets a midpoint near 8.6 inches with a working window of roughly 8.0 to 9.3 inches (±0.625 inches around the midpoint). A 70-inch bow centers around 8.9 inches.
Measure the perpendicular distance from the resting string to the deepest point of the grip (the pivot point), in inches. A T-square bow gauge hooked on the string is the standard way to read it consistently.
On a recurve you add twists to the string to raise brace height and remove twists to lower it, a few turns at a time. If the manufacturer publishes a recommended range for your specific model, that printed range takes precedence over the generic percentage rule used here.