How is my water target calculated?

It's based on your body weight with an adjustment for exercise. Hot weather and illness can raise your needs, so use it as a helpful baseline.

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Water Intake Calculator

How much water you should drink daily.

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How to use the Water Intake Calculator

1Enter your body weight and choose your units.
2Set your daily activity/exercise level.
3See your recommended daily water intake.

About the Water Intake Calculator

Free water intake calculator — estimate how much water you should drink each day based on your body weight and activity level. Get your target in cups, ounces and litres.

Part of our Calculators collection. Browse all tools.

Frequently asked questions

How is my water target calculated?: It's based on your body weight with an adjustment for exercise. Hot weather and illness can raise your needs, so use it as a helpful baseline.