Water intake at 280 lb
A common starting point is 35 milliliters of water per kilogram of body weight, plus more for exercise. Here it is applied to 280 lb with 30 minutes of exercise.
How it works
Multiply your weight in kilograms by 35 to get milliliters of water. Add 350 milliliters for every 30 minutes of exercise. The page converts the total to liters and ounces. For 280 lb with 30 minutes of exercise, the exercise part is 350 ml.
Worked example
Take a person who weighs 280 lb with 30 minutes of exercise. In metric that is 127.01 kg. Multiply by 35: 127.01 × 35 = 4445.35 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. The total is 4795.35 ml. Divide by 1000 to get 4.80 liters. Divide 4795.35 by 29.5735 to get 162.2 ounces. Divide by 8 to get 20.3 cups.
Common questions
How many ounces or cups is that?
A US fluid ounce is 29.5735 milliliters and a cup is 8 ounces. At 280 lb with 30 minutes of exercise, 4795.35 ml is 162.2 ounces or 20.3 cups.
Do coffee and tea count toward my water?
Most drinks count toward your fluid total, though plain water is the simplest choice. At 280 lb with 30 minutes of exercise, 4.80 liters a day is about 20 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 280 lb with 30 minutes of exercise, treat 4.80 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 5145.35 ml.
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 280 lb the starting figure is 4445.35 ml before exercise, and 4795.35 ml with 30 minutes of exercise.