How it works
We use about 35 ml per kg of body weight, plus about 12 oz for every 30 minutes of exercise and 17 oz on hot days. Some water also comes from food.
Example
A 160 lb person exercising 30 minutes a day needs about 98 oz (2.9 liters).
People with kidney or heart conditions should follow their doctor's advice.
Frequently asked questions
Does coffee count?
It counts as fluid, but plain water is still the best choice.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.