Water intake at 170 lb
Enter your weight and exercise time to estimate how much water to drink in a day. The example below is 170 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 170 lb with 30 minutes of exercise, the body weight part of the target is 2698.85 milliliters.
Worked example
For 170 lb with 30 minutes of exercise, the weight is 77.11 kg. Body weight gives 77.11 × 35 = 2698.85 ml. Exercise adds 350 × 30 divided by 30 = 350 ml. The daily target is 3048.85 ml. Divide by 1000 for 3.05 liters. Divide by 29.5735 for 103.1 ounces. Divide by 8 for 12.9 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 170 lb with 30 minutes of exercise, 3048.85 ml is 103.1 ounces or 12.9 cups.
Do coffee and tea count toward my water?
Most drinks count toward your fluid total, though plain water is the simplest choice. At 170 lb with 30 minutes of exercise, 3.05 liters a day is about 13 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 170 lb with 30 minutes of exercise, treat 3.05 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 3398.85 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 170 lb the starting figure is 2698.85 ml before exercise, and 3048.85 ml with 30 minutes of exercise.