Enter the body weight (lbs) and the exercise time (min) into the Calculator. The calculator will evaluate the Fluid Ounces from Galpin Equation. 

Fluid Ounces from Galpin Equation Formula

FO = W / 30 *T/15


  • FO is the Fluid Ounces from Galpin Equation ((oz of fluid))
  • W is the body weight (lbs)
  • T is the exercise time (min)

To calculate Fluid Ounces from Galpin Equation, divide your body weight by 30, then multiply by the exercise time over 15.

How to Calculate Fluid Ounces from Galpin Equation?

The following steps outline how to calculate the Fluid Ounces from Galpin Equation.

  1. First, determine the body weight (lbs). 
  2. Next, determine the exercise time (min). 
  3. Next, gather the formula from above = FO = W / 30 *T/15.
  4. Finally, calculate the Fluid Ounces from Galpin Equation.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

body weight (lbs) = 200

exercise time (min) = 30


What is the Galpin Equation used for?

The Galpin Equation is used to calculate the amount of fluid ounces a person should consume based on their body weight and the duration of their exercise. It helps in ensuring adequate hydration during physical activities.

Why is hydration important during exercise?

Hydration is crucial during exercise because it helps maintain normal body function, regulates body temperature, and prevents dehydration. Adequate hydration can also improve performance and reduce the risk of heat-related illnesses.

Can the Galpin Equation be used for any type of exercise?

Yes, the Galpin Equation can be applied to any type of exercise or physical activity where hydration is a concern. However, the specific hydration needs may vary based on the intensity and environment of the exercise.

How accurate is the Galpin Equation for calculating fluid needs?

The Galpin Equation provides a general guideline for fluid intake during exercise. However, individual hydration needs can vary based on factors such as age, sex, weight, environmental conditions, and exercise intensity. It’s important to listen to your body and adjust fluid intake as needed.