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Water Intake Calculator

A daily hydration target from your weight, exercise and climate.

How to use

  1. Enter your weight.
  2. Add minutes of daily exercise and pick your climate.
  3. See your target in litres and 250 ml glasses.

Frequently asked questions

Is 8 glasses a day right?

It's a rough average. Needs scale with body size and sweat loss - this uses ~33 ml/kg plus exercise and climate adjustments.

Does tea or food count?

Yes - food supplies roughly 20% of fluids, and most beverages count towards the total.

Is this medical advice?

No. Some conditions require restricted or increased fluids - follow your clinician's guidance.

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