Does the recommendation include food water?
Yes, 3.7L/2.7L includes all fluids plus ~500-750mL from food.
Health Fitness
Daily Water Intake Calculator
Estimate your daily water needs based on weight, activity, and climate
Stay Hydrated
Calculate recommended water intake in liters
What this calculator does
Daily water needs are ~3.7L (men) and 2.7L (women) including all beverages and food water content. Proper hydration supports temperature regulation, nutrient transport, and cognitive function.
How it works
Base amount adjusted for body weight, activity, climate. About 81% from beverages, 19% from food.
Formula
Base + (Weight kg × 0.033L) + (Activity min ÷ 30 × 0.5L) + environment adjustments.
Tips for using this calculator
- Drink consistently throughout day—kidneys process ~800-1000mL/hour
- Use urine color as guide: pale yellow = hydrated
- Add 12 oz per 30 min of moderate activity
- Hot weather and altitude increase needs
- Monitor for dry mouth, fatigue, dark urine
Frequently asked questions
Can I drink too much water?
Rare, but excessive intake without electrolytes can cause hyponatremia. Spread intake throughout day.
Do coffee and tea count?
Yes, caffeinated beverages still contribute to hydration despite mild diuretic effect.