Enter your total body weight, minutes of exercise, and difficulty of exercise into the calculator. The calculator will evaluate and display your suggested water intake per day.

Water Intake Formula

The following formula is used to calculate your daily water intake needs.

Total Water Intake = .65 * bw + e*.40*df

  • Where total water intake is in ounces
  • bw is your body weight in lbs
  • e is your number of exercise minutes
  • df is the difficulty factor of your exercise

In this case, since the exertion level of your exercise is directly correlated with how much water you lose to sweat, you must add a factor that accounts for that. Please listen to your own body, and drink as much as you feel you need. This is only an estimation.

Another important aspect to keep in mind when considering your daily water intake is electrolytes. If you are working out often, you lose many electrolytes to sweat. Make sure you are drinking enough electrolytes like salt and potassium when exercising to avoid cramps.

Water Intake Definition

Water intake is defined as the total volume of water a person should consume in order to live healthy based on their size and activity level.

Water Intake Example

How to calculate water intake?

  1. First, determine your body weight.

    Measure your body weight.

  2. Next, determine your activity level.

    Calculate the length and intensity of your activity.

  3. Finally, calculate your water intake.

    Use the calculator or formula above to calculate your recommended water intake.


How much water should i drink per day?

The average guideline for water intake says that you should drink two-thirds of your body weight in ounces of water. For example, if you weigh 100lbs, you should drink around 66 ounces of water per day.

Does water intake effect excercise?

Absolutely, proper water intake is essential for athletic performances. Just as important is drinking enough electrolytes with that water.

water intake calculator
water intake formula