💧 Daily Water Intake Calculator
Find out how much water you should drink each day based on your body weight, activity level, and climate.
Your Details
Your Result
This is a general estimate for informational purposes only, not medical advice. Individual hydration needs vary — consult a doctor if you have kidney, heart, or other conditions affecting fluid intake.
How This Daily Water Intake Calculator Works
This water intake calculator starts with a baseline of half your body weight (in pounds) in ounces of water per day — a commonly used guideline — then adds extra water for exercise and hot/humid climates, since both increase fluid loss through sweat.
Formula
+ Exercise Adjustment (12 oz per 30 min of exercise, based on activity level)
× Climate Multiplier (1.0 temperate, 1.1 hot/humid, 1.2 very hot)
This tool provides a general estimate for informational purposes only. Actual hydration needs vary by individual, diet, medications, and health conditions — consult a doctor or registered dietitian for personalized guidance.
Frequently Asked Questions
How much water should I drink a day?
A common baseline is about half your body weight in pounds, in ounces of water per day, adjusted upward for exercise and hot climates. This calculator applies that formula to your specific stats.
Does all fluid intake count toward hydration?
Water is the most efficient source, but other beverages and water-rich foods (fruits, vegetables, soup) also contribute to daily hydration.
Can I drink too much water?
Yes — drinking excessive amounts of water in a short period can lead to a dangerous condition called hyponatremia. Spread your intake throughout the day rather than drinking it all at once.