Data-backed tools to plan your jiu-jitsu journey — built and pressure-tested by a physician purple belt, not pulled from gym folklore. Free, no sign-up to use.
BJJ Black Belt Calculator — Project your personal black belt date from how you actually train. Calibrated to survey data from 1,948 practitioners — the real average is 13.3 years, not 10.
Weight Cut Calculator (coming soon) — Plan a safe, legal cut to your division — water-loading schedule, daily targets, and a hard stop before you hurt your performance or your health.
Jiu-Jitsu Style Quiz (coming soon) — Answer a handful of questions and find the game that fits your body and brain — guard player, pressure passer, leg locker, or scrambler.