Water intake at 240 lb
Enter your weight and exercise time to estimate how much water to drink in a day. The example below is 240 lb with 30 minutes of exercise.
How it works
Take your weight in kilograms and multiply by 35. Then add 350 for each half hour of exercise. That is your daily water target in milliliters. At 240 lb, 30 minutes of exercise adds 350 ml.
Worked example
For 240 lb with 30 minutes of exercise, the weight is 108.86 kg. Body weight gives 108.86 × 35 = 3810.1 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. The daily target is 4160.1 ml. Divide by 1000 for 4.16 liters. Divide by 29.5735 for 140.7 ounces. Divide by 8 for 17.6 cups.
Common questions
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 240 lb with 30 minutes of exercise, treat 4.16 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 4510.1 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 240 lb the starting figure is 3810.1 ml before exercise, and 4160.1 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 240 lb with 30 minutes of exercise, spread over 16 waking hours, 4.16 liters is about 260 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 240 lb with 30 minutes of exercise, 4160.1 ml is 140.7 ounces or 17.6 cups.