Daily Water Intake Calculator

This tool estimates your daily water needs based on your weight, activity level, and climate.

Water intake is an estimate and your individual needs may vary based on factors such as body composition, age, pregnancy or breastfeeding, climate, activity level, and certain health conditions. Use this calculator as a general guide, and speak with a healthcare provider for recommendations tailored to you.

How this is calculated. Based on roughly half an ounce of fluid per pound of body weight, adjusted for training volume and climate, and cross-checked against the National Academies’ adequate-intake reference of about 125 oz (3.7 L) of total daily water for men and 91 oz (2.7 L) for women — figures that include water from food.