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Calculate your daily water intake needs based on weight, activity level, and climate. Get personalized hydration recommendations and tips.
Daily water intake is the recommended volume of water a person should drink each day, based on body weight, activity level, climate, and lifestyle factors.
Coffee, tea, energy drinks
Beer, wine, spirits
Formula
Water (ml) = Weight (kg) × 33 × Activity Factor × Climate FactorBase = 33 ml per kg of body weight per day
Activity Factor = 1.0 (sedentary) to 1.4 (athlete/physical job)
Climate Factor = 0.95 (cold) to 1.3 (very hot, >35°C)
Caffeine/Alcohol = +150 ml per caffeinated drink, +250 ml per alcohol serving
Worked Example
Example: 70 kg, moderately active, warm climate, 2 coffees
Did you know? The popular rule to drink 8 glasses (2 litres) of water per day was first mentioned in a 1945 US Food and Nutrition Board recommendation — with the caveat that most of it comes from food. That caveat has been largely forgotten.
Sources
33ml per kg of body weight (or half your weight in oz)
Increased for exercise and physical activity
Hot weather increases water needs
Extra water for caffeine and alcohol
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