Water intake at 270 lb
A common starting point is 35 milliliters of water per kilogram of body weight, plus more for exercise. Here it is applied to 270 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 270 lb with 30 minutes of exercise, the body weight part of the target is 4286.45 milliliters.
Worked example
For 270 lb with 30 minutes of exercise, the weight is 122.47 kg. Body weight gives 122.47 × 35 = 4286.45 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. The daily target is 4636.45 ml. Divide by 1000 for 4.64 liters. Divide by 29.5735 for 156.8 ounces. Divide by 8 for 19.6 cups.
Common questions
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 4986.45 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 270 lb the starting figure is 4286.45 ml before exercise, and 4636.45 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 270 lb with 30 minutes of exercise, spread over 16 waking hours, 4.64 liters is about 290 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 270 lb with 30 minutes of exercise, 4636.45 ml is 156.8 ounces or 19.6 cups.
Do coffee and tea count toward my water?
Most drinks count toward your fluid total, though plain water is the simplest choice. At 270 lb with 30 minutes of exercise, 4.64 liters a day is about 20 cups spread across the day.