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How Much Water to Drink Calculator

Health information notice: Results are estimates for general information only and are not a diagnosis or substitute for personalized advice from a qualified healthcare professional.

Estimate a daily fluid target from a chosen milliliters-per-kilogram guideline.

Formula and assumptions

This is not a universal prescription. Fluid needs vary with health, climate, activity and medications; follow clinician advice where applicable.

Results depend on the inputs and assumptions shown. Check units and independently verify important decisions.

For general information. Report an issue.

Frequently asked questions

How much water should I drink each day?

Needs vary with body size, activity, climate, diet and health. This tool applies the guideline you select; it is not a universal prescription.

Does this estimate include water from food?

That depends on the guideline used. Some recommendations refer to total water from drinks and food, while this calculator may estimate fluid intake only. Check the method displayed on the page.

Who should seek individual fluid advice?

People with kidney, heart or liver conditions, those taking certain medicines, and anyone given fluid restrictions should follow advice from their healthcare professional.