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Water intake calculator, in 30 seconds

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Water intake calculator

About 20% of the water you take in each day comes from food, which is why the official intake numbers look bigger than what most people drink.

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Step 1

Pick your sex and enter your weight.

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Step 2

Enter your average minutes of exercise a day.

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Step 3

Choose mild or hot and humid weather, and say whether you take a GLP-1 medicine.

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The rule of thumb we use

Base: half your body weight in ounces (0.5 oz per lb) Exercise: plus 12 oz for every 30 minutes Heat: plus 16 oz in hot or humid weather…

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How it compares with official guidance

The National Academies set adequate intakes for total water of about 3.7 liters a day for men and 2.7 liters for women, including water…

Want the full picture?

Get a daily water target from your weight, exercise and climate, compared with the National Academies' adequate intake. Includes a GLP-1 note.

Tap below for the full page. Not medical advice; talk to your clinician about your care.

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