All 20 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.
Rules, weigh-ins and scoring
IBJJF Weight Class Finder
Find your gi division by weight and sex.
Open calculator 02Tournament Weight Cut Planner
Plan a safe cut to your target division.
Open calculator 03IBJJF Points Calculator
Score a live match — points, advantages, subs.
Open calculator 04IBJJF Age Division Lookup
Birth year to Juvenile / Adult / Master bracket.
Open calculator 11IBJJF Match Time Lookup
Round length by belt and age division.
Open calculator 12ADCC Weight Class Finder
Find your ADCC submission-grappling division.
Open calculatorGetting the gi right
BJJ Gi Size Finder
Height + weight to a starting gi size.
Open calculator 06Gi Shrinkage Calculator
Estimate shrink by fabric, wash and dry.
Open calculator 13BJJ Belt Size Calculator
Find your BJJ belt size (A0–A5).
Open calculator 14BJJ Gi Rotation Calculator
How many gis your wash schedule needs.
Open calculator 15BJJ Mat Space & Cost Calculator
Mats and cost to cover a training space.
Open calculatorFuel, recovery and progress
Caloric Needs for Grapplers
Calories + macros for your training week.
Open calculator 08Belt Promotion Timeline Estimator
A realistic range to your next belt.
Open calculator 09Return-to-Roll Calculator
A recovery-timeline starting point by injury.
Open calculator 10Training Load Calculator
Read load vs recovery from sleep and age.
Open calculator 16Calories Burned in BJJ
Calories burned per BJJ session by intensity.
Open calculator 17Protein Intake Calculator for Grapplers
Daily protein target by weight and goal.
Open calculator 18Sweat Rate & Rehydration Calculator
Measure fluid lost in a session and replace it.
Open calculator 19One-Rep Max (1RM) Calculator
Estimate your 1RM from reps and weight.
Open calculator 20Daily Hydration Calculator for Grapplers
Daily water target with training added in.
Open calculator