Health & Training

Daily Hydration Calculator for Grapplers

Estimate your daily water target as a grappler — a bodyweight baseline plus what you sweat out in training. A sensible starting point, not a medical rule.

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Your daily water baseline

A practical baseline for daily fluid is around 30–40 ml per kilogram of bodyweight, which already includes water from food and other drinks. This tool starts there, scaled to your weight, then adds an allowance for training. Bigger bodies and hotter climates need more; the number is a target to aim at, not a quota to force down.

Adding training and climate

Hard training adds meaningful fluid loss — we add roughly 0.5–0.7 litres per hour of grappling, bumped up in hot or humid conditions where you sweat more. The best real-time guides are still your body: thirst and urine colour. Pale-straw urine means you're well hydrated; dark means drink more. If you want a precise per-session number, measure your actual sweat rate with the sweat-rate tool.

Frequently asked questions

How much water should I drink on training days?
Start from a baseline of about 30–40 ml per kg of bodyweight, then add roughly half a litre to a litre for each hour you train — more in heat. This tool estimates yours.
Is urine colour a good hydration check?
Yes — pale straw means you're well hydrated, darker yellow means drink more. It's a better day-to-day guide than hitting an exact number.
Can I drink too much water?
Rarely, but overdrinking plain water around very long sessions can dilute sodium. For long, sweaty training, include electrolytes rather than only water.