Water intake at 140 lb
Daily water needs depend on body weight and activity. This page works out the amount for a person who weighs 140 lb with 30 minutes of exercise.
How it works
Water in milliliters equals 35 times weight in kilograms plus 350 times exercise minutes divided by 30. Enter pounds and the page converts them first. At 140 lb, 30 minutes of exercise adds 350 ml.
Worked example
Convert first: 140 lb is 63.5 kg. Then 63.5 × 35 = 2222.5 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. 2222.5 + 350 = 2572.5 ml. That is 2.57 liters, 87.0 ounces or 10.9 cups.
Common questions
Can I drink too much water?
Yes, though it is uncommon. Drinking far more than you need in a short time can dilute the salts in your blood. Spread your intake through the day. At 140 lb with 30 minutes of exercise, spread over 16 waking hours, 2.57 liters is about 161 ml an hour.
How many ounces or cups is that?
A US fluid ounce is 29.5735 milliliters and a cup is 8 ounces. At 140 lb with 30 minutes of exercise, 2572.5 ml is 87.0 ounces or 10.9 cups.
Do coffee and tea count toward my water?
Most drinks count toward your fluid total, though plain water is the simplest choice. At 140 lb with 30 minutes of exercise, 2.57 liters a day is about 11 cups spread across the day.
Does food count toward the total?
Food contains water. Treat the result as a goal for your total fluid across the day and not a quota for drinks alone. At 140 lb with 30 minutes of exercise, treat 2.57 liters as a goal for the day, not a quota for one sitting.
What if I exercise more or less than this?
Change the exercise minutes. Each 30 minutes adds 350 milliliters. At 30 minutes the page adds 350 ml. An extra 30 minutes would bring the total to 2922.5 ml.