Water Intake Calculator
How much water to drink daily, based on your weight and activity.
Estimate a daily water intake target based on your body weight, exercise minutes, and climate — using the commonly recommended 30-35 ml per kilogram baseline.
Frequently asked questions
How is this calculated?
A baseline of about 33 ml of water per kilogram of body weight — a range (30-35 ml/kg) commonly used by dietitians for average healthy adults — plus extra for exercise, since sweating increases fluid needs.
Does this include water from food and other drinks?
No — this is an estimate of water/fluid intake specifically. In practice, food and other beverages also contribute to daily hydration.
Is this accurate for everyone?
It's a general guideline for healthy adults in moderate climates. Needs vary with heat, altitude, pregnancy/breastfeeding, and certain health conditions (like kidney or heart disease) — check with a doctor if any of those apply to you.
This tool provides a general estimate and isn't medical advice.