BJJ Weight Cutting Guide — Safe Rehydration & Competition Prep

Weight cutting is one of the most misunderstood aspects of BJJ competition. Done right, it gives you a size advantage. Done wrong, it tanks your performance and risks your health. Here's the science-backed approach.

How Much Should You Cut?

Most competitive grapplers cut 3–5% of body weight. Cutting beyond 8% significantly impairs strength, endurance, and cognitive function. Calculate your natural walk-around weight vs. your target division weight.

The Water Cut Protocol

7 days out: reduce sodium and carbs to decrease water retention. 3 days out: limit water to 1.5–2L/day. 24–36 hours out: moderate restriction, hot baths/sauna for 30–45 min sessions. Never cut more than 4–5 kg of water weight.

Rehydration After Weigh-In

Rehydration window = time between weigh-in and match. 2+ hours: drink 500ml–1L per kg cut, consume electrolytes (sodium, potassium, magnesium), eat easily digestible carbs (rice, banana, sports drink). Less than 1 hour: sip electrolyte drinks only.

Day-Of Nutrition

Pre-match meal 2–3 hours before: 200–300g carbs + 30g protein + minimal fat. 30 min before: banana or small handful of dates + 250ml water. Avoid: high-fiber foods, dairy, fried food.

Red Flags — When to Stop

Dizziness during the cut, heart palpitations, confusion, inability to urinate — these are signs of dangerous dehydration. Abort the cut immediately.

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