Body Water Percentage Calculator: Hydration Levels
Find out what percentage of your body weight is water. Learn why hydration matters for health, how age and gender affect body water, and how to stay optimally hyd...
What is Body Water Percentage?
Body water percentage is the proportion of your total body weight made up of water. Water is essential for virtually every physiological process — from regulating temperature to transporting nutrients and flushing waste. Average adult body water content ranges from 45% to 65%, varying by age, gender, and body composition.
💧 Body Water Percentage Calculator
Use our free calculator for instant, accurate results.
📐 Formula
BWP (Men) = 2.447 − 0.09156×Age + 0.1074×Height + 0.3362×Weight
Watson Formula (1980): Height in cm, Weight in kg, Age in years. Result in liters; divide by weight to get percentage.
📝 Worked Example
A 25-year-old male, height 175 cm, weight 70 kg:
Total Body Water ≈ 42.5 L → Body Water % = 42.5/70 × 100 = 60.7% (within healthy range)
📝 How to Use the Calculator
❓ FAQ
Does muscle contain more water than fat?
Yes — muscle tissue is ~75% water while fat tissue is only ~10% water. Athletes typically have higher body water percentages.
How much water should I drink daily?
General guidance is 35 mL per kg of body weight, but needs vary with activity, climate, and health status.
Veer Kumavat
Founder & AuthorVeer is a 14-year-old student from Nashik, Maharashtra, who built SciFi Calculators to help students worldwide master STEM subjects. He is passionate about making complex science and math problems accessible through intuitive digital tools.