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Free tool
Water Intake Calculator
There is no single right amount of water for everyone. This calculator gives a rough daily estimate from your weight, activity and climate (Florida summers count as hot), shown in liters, ounces and cups.
Your result
Fill in the form and choose Calculate. Results appear here and never leave your browser.
Estimates are educational. They do not diagnose any condition and do not establish eligibility for any medication. A licensed provider decides what is appropriate for you. Explore programs.
How it works
Total water (L) = 0.035 × weight (kg) + activity addition + climate addition
- Baseline: 35 mL per kg, a common rule of thumb for healthy adults.
- Activity: 0 to 1.4 L for typical sweat losses.
- Climate: 0, 0.5 or 1.0 L.
The National Academies adequate intake for total water is about 3.7 L per day for men and 2.7 L for women, from food and drinks combined. Most healthy people meet their needs by drinking when thirsty.
Limitations
- A rough estimate only.
- If you have a fluid restriction (heart failure, kidney disease, low sodium), follow your care team's limit.
- Pregnancy and breastfeeding raise needs beyond this estimate.
Does coffee count toward my water intake?
Yes. Caffeinated drinks contribute to total water intake for regular consumers.
Why show total water and drinking water separately?
Official values cover all sources. Roughly 80 percent comes from drinks and 20 percent from food.
How do I know if I am drinking enough?
Pale yellow urine, infrequent thirst and steady energy are practical signs for most healthy adults.
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