Daily Water Intake & Hydration Schedule
Calculate your optimal daily water intake based on body weight, exercise duration, and climate with a personalised hourly hydration schedule.
Visual Daily Glass Breakdown
Personalized All-Day Hydration Timeline
💧 Clinical Hydration Benchmark
This recommendation aligns with European Food Safety Authority (EFSA) and US National Academy of Medicine benchmarks (30–35 mL per kilogram of body weight, plus electrolyte compensation for metabolic water loss during exercise).
About this tool
How to use it
- Enter your body weight in kilograms (kg) or pounds (lbs).
- Select your average daily exercise duration (0 to 90+ minutes).
- Choose your local climate (Temperate, Hot/Sunny, Arid, or Dry Air-Conditioned Office).
- Read your total target volume (in Liters and fluid ounces) and follow the glass-by-glass hourly schedule.
Why it matters
The popular '8 glasses a day' myth ignores body mass, ambient sweat rates, and workout intensity. Under-hydrating reduces cognitive focus and physical stamina, while over-hydrating without electrolytes can dilute blood sodium. A personalized scientific formula provides optimal fluid balance.
When to use it
Use this calculator when starting a fitness training regimen, adjusting to hot summer weather or high altitudes, recovering from dehydration, or tracking daily health habits.
Good to know
Food accounts for approximately 20% of standard daily fluid intake (fruits, soups, vegetables). The volume calculated here represents recommended direct beverage water consumption.
Common questions
How much water should I drink per kilogram of body weight?
Clinical guidelines from the European Food Safety Authority (EFSA) recommend approximately 30 to 35 mL of water per kilogram of body weight for healthy adults under normal conditions.
How much additional water is needed during workouts?
Add approximately 350 mL (12 fluid ounces) for every 30 minutes of moderate exercise to compensate for sweat and respiratory evaporation.
Does coffee or tea count toward my daily water goal?
Yes. Modern clinical studies show that moderate caffeine consumption (under 400 mg/day) does not cause net dehydration, and coffee or tea contributes positively to total daily fluid intake.
How do I know if I am adequately hydrated?
The simplest reliable indicator is urine color: light pale straw yellow indicates good hydration, while dark amber indicates mild dehydration requiring 1 to 2 glasses of water immediately.