Water intake at 150 lb
Daily water needs depend on body weight and activity. This page works out the amount for a person who weighs 150 lb with 30 minutes of exercise.
How it works
Start with 35 milliliters for each kilogram you weigh. Add 350 milliliters for every 30 minutes you exercise. Divide milliliters by 29.5735 to get fluid ounces. This page converts 150 lb to 68.04 kg first, with 30 minutes of exercise.
Worked example
Say a person weighs 150 lb with 30 minutes of exercise. That is 68.04 kg. The body weight part is 68.04 × 35 = 2381.4 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. Together that is 2731.4 ml, which is 2.73 liters or 92.36 ounces. In cups that is 11.5.
Common questions
Is 35 milliliters per kilogram right for everyone?
No. It is a common starting estimate. Heat, illness, pregnancy and some health conditions change needs. For 150 lb the starting figure is 2381.4 ml before exercise, and 2731.4 ml with 30 minutes of exercise.
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 150 lb with 30 minutes of exercise, spread over 16 waking hours, 2.73 liters is about 171 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 150 lb with 30 minutes of exercise, 2731.4 ml is 92.36 ounces or 11.5 cups.
Do coffee and tea count toward my water?
Most drinks count toward your fluid total, though plain water is the simplest choice. At 150 lb with 30 minutes of exercise, 2.73 liters a day is about 12 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 150 lb with 30 minutes of exercise, treat 2.73 liters as a goal for the day, not a quota for one sitting.