Daily Water Intake Calculator
Estimate how much water you need each day based on your weight, activity, and climate. It’s a quick, science-informed starting point — your body knows best.
About this calculator
How is my water intake calculated?
We start from about 30 ml of water per kilogram of body weight, then adjust with a factor for your activity level and your climate. The result is a daily target in milliliters (or ounces).
Is this medical advice?
No. This calculator gives a general estimate for healthy adults. Your real needs depend on health, medication, pregnancy, and more — check with a professional for personal guidance.
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