Daily Water Intake Calculator
Estimate your daily water needs based on body weight, activity level, and climate.
Informational estimate only. Not medical advice. All fluids (water, tea, coffee, foods) contribute to total hydration.
Frequently Asked Questions
How is this calculated?
Baseline: ~35 mL per kg bodyweight (≈0.5 oz/lb). Additions: +350 mL per 30 minutes of exercise, +10% for hot climate. Rounded to reasonable daily totals.
Does coffee or tea count?
Yes — most fluids contribute to hydration. The old 'coffee dehydrates you' claim is largely a myth for habitual drinkers; net fluid gain is positive.
Can I drink too much water?
Yes. Drinking several liters in a short time can dilute sodium (hyponatremia). Spread intake across the day and don't force volumes you don't need.
Is this medical advice?
No. This tool is for informational purposes only and is not a substitute for advice from a registered dietitian or physician.