Know your numbers before you step on the mat.
Weight classes, points, weight cuts, gi sizing, recovery — the numbers every BJJ practitioner Googles mid-week, worked out from cited sources instead of forum guesses.
Every result links to the IBJJF rule or sports-medicine source behind it. Nothing here is made up to fill a box.
The ones people open most
Jump straight into the four calculators grapplers reach for before a comp, a gi order, or a hard week of training.
Built like a calculator, reviewed like methodology
A wrong weight class or a reckless cut costs someone a medal or their health. So every tool is sourced, shown, and held to a review standard before we call it done.
Straight from the rule book
Divisions, points and brackets follow the current IBJJF rules — with the gi-on weigh-in convention competitors actually face.
Every number is sourced
Open the methodology page and you can trace each calculator to the rule, study, or equation it runs on. No black boxes.
Practitioner review before launch
Health and rules tools are written for black-belt and sports-medicine review. Until that’s signed off, each one says so plainly.
Honest about estimates
Recovery, belt timelines and calories are ranges, not promises. We label what’s a rule versus what’s an educated estimate.
The 20 BJJ calculators
Filter by what you need. Competition prep, gear and sizing, or health and training.
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 calculatorBJJ 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 calculatorCaloric 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 calculatorNo serious calculator hub for grappling existed. So we built one.
Search any of these questions today and you get a PT clinic blog, a five-year-old Reddit thread, or a forum argument. We wanted one place that does the math, shows its work, and earns the community’s trust the hard way.
The Tournament Prep Checklist
One page: making weight safely, registration deadlines, what to pack, and a warm-up that won’t gas you before bracket one. Join the list and we’ll send it over.
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- Weigh-in math, double-checked
- Safe cut timeline
- Mat-side warm-up
- Packing & rules recap