Body Water Percentage Calculator
Your Hydration Analysis
Body Water Percentage Calculator
This calculator estimates your total body water percentage based on established medical formulas. Your body water percentage is an important indicator of hydration and overall health, varying by age, gender, weight, and body composition.
Why Body Water Percentage Matters
Water makes up about 50-75% of your body weight. Monitoring your hydration level helps maintain optimal physical and cognitive function, prevents dehydration-related health issues, and supports metabolic processes.
How the Calculator Works
The calculator uses the Watson formula, one of the most accurate methods for estimating total body water:
For Men:
TBW = 2.447 – (0.09156 × age) + (0.1074 × height) + (0.3362 × weight)
For Women:
TBW = -2.097 + (0.1069 × height) + (0.2466 × weight)
Understanding Your Results
Normal body water percentage ranges:
- Adult Men: 50-65% of body weight
- Adult Women: 45-60% of body weight
- Infants: 75-78% (highest at birth)
- Elderly: 5-10% lower than younger adults
Tips for Healthy Hydration
- Drink 30-35ml of water per kg of body weight daily
- Increase intake during exercise or hot weather
- Monitor urine color (pale yellow is ideal)
- Eat water-rich fruits and vegetables
- Limit diuretics like caffeine and alcohol
Frequently Asked Questions
For adult men, 50-65% is considered healthy. For women, 45-60% is normal. Athletes often have higher percentages due to greater muscle mass (muscle holds more water than fat).
Men typically have more muscle mass and less body fat than women. Since muscle contains about 75% water while fat contains only about 10%, men generally have higher total body water percentages.
This provides a good estimate (±2-3%) for most people. For precise measurement, medical professionals use methods like bioelectrical impedance analysis (BIA) or deuterium dilution.
Temporarily yes, but your body quickly eliminates excess water. Chronic overhydration can be dangerous. Focus on maintaining consistent, adequate hydration rather than chasing higher percentages.
Body water percentage decreases about 0.3-0.5% per decade after age 30 due to muscle loss and increased fat. Elderly people are more prone to dehydration and should monitor hydration carefully.