Tennis tools

This calculator turns a calendar rule of thumb into a rough reminder. It applies a 1.5× multiplier for polyester and rounds to at least one restring per year; this is a scheduling assumption, not a measured string-life model. It does not account for session length, exact setup, wear or changes in response. Build a schedule from your own playing history.

Points head-light (negative means head-heavy). 1 point = 1/8 in = 3.175 mm, measured against the midpoint of the racket.