More tools · Wellness
Water Intake Calculator
Estimate how much water to drink daily based on your weight, activity level, and climate.
This is a general estimate. Needs vary with health conditions, medications, pregnancy, and breastfeeding. Ask a doctor for guidance if you have kidney, heart, or other conditions that affect fluid intake.
How this is calculated
This uses a common baseline of about 33ml of water per kilogram of body weight, then adds roughly 350ml for every 30 minutes of exercise (to replace fluid lost through sweat), and an extra 500ml if you selected a hot or humid climate. It's a reasonable starting estimate, not a precise physiological requirement. Thirst, urine color (pale yellow is a good sign), and how you feel are still the best day-to-day guides.