The toolkit

All 10 BJJ calculators

Every BJJMath tool in one place, grouped by what you’re working on. Each one shows its source and links to the full methodology.

IBJJF-SourcedSports-Medicine CitedSources Cited
Competition

Rules, weigh-ins and scoring

01

IBJJF Weight Class Finder

Find your gi division by weight and sex.

Open calculator 02

Tournament Weight Cut Planner

Plan a safe cut to your target division.

Open calculator 03

IBJJF Points Calculator

Score a live match — points, advantages, subs.

Open calculator 04

IBJJF Age Division Lookup

Birth year to Juvenile / Adult / Master bracket.

Open calculator
Gear & Sizing

Getting the gi right

05

BJJ Gi Size Finder

Height + weight to a starting gi size.

Open calculator 06

Gi Shrinkage Calculator

Estimate shrink by fabric, wash and dry.

Open calculator
Health & Training

Fuel, recovery and progress

07

Caloric Needs for Grapplers

Calories + macros for your training week.

Open calculator 08

Belt Promotion Timeline Estimator

A realistic range to your next belt.

Open calculator 09

Return-to-Roll Calculator

A recovery-timeline starting point by injury.

Open calculator 10

Training Load Calculator

Read load vs recovery from sleep and age.

Open calculator