💧 Body Water Calculator
Estimate your total body water (TBW) using the Watson formula for men and women.
How to Interpret the Results
A healthy total body water percentage typically ranges between 50–65% for men and 45–60% for women. If your value is lower, it might indicate dehydration or low muscle mass.
Tips for Improving Hydration
- Drink water consistently throughout the day, not just when you feel thirsty.
- Consume foods with high water content, like cucumbers, oranges, and lettuce.
- Limit caffeine and alcohol intake.
- Use the Water Intake Calculator to determine your optimal hydration level.
For more accurate tracking, combine this tool with the Body Fat Calculator or BMI Calculator to monitor your fitness progress.
Body Water Calculator – Calculate Your Total Body Water Percentage
The Body Water Calculator helps you estimate how much water your body contains based on your age, gender, height, and weight. Water makes up a major portion of our body — in fact, it accounts for 50–70% of body weight. Maintaining the right hydration level is crucial for energy, metabolism, and overall health.
What Is Body Water?
Body water refers to all the water contained in your body, distributed between cells, tissues, blood, and organs. It supports vital processes such as nutrient transport, temperature regulation, digestion, and joint lubrication. Your body’s total water content changes with age, gender, and body composition — lean muscle holds more water than fat.
Using a Body Water Calculator can help you understand whether you are properly hydrated and how your body composition affects water percentage. It’s especially useful for athletes, fitness enthusiasts, and anyone tracking health metrics.
How the Body Water Calculator Works
This calculator uses scientifically validated equations such as the Watson Formula and the Hume Formula to estimate Total Body Water (TBW). Both formulas take into account your weight, height, age, and gender to provide accurate results.
Watson Formula
- Men: TBW (L) = 2.447 – (0.09156 × Age) + (0.1074 × Height in cm) + (0.3362 × Weight in kg)
- Women: TBW (L) = –2.097 + (0.1069 × Height in cm) + (0.2466 × Weight in kg)
The Watson method is widely used in medical practice for its reliability and accuracy in estimating body water percentage.
Hume Formula
- Men: TBW (L) = 0.194786 × Height + 0.296785 × Weight – 14.012934
- Women: TBW (L) = 0.34454 × Height + 0.183809 × Weight – 35.270121
The Hume formula provides an alternative calculation and is particularly useful for people with non-average body compositions.
Typical Body Water Percentage
| Group | Average Body Water % |
|---|---|
| Adult Men | 50–65% |
| Adult Women | 45–60% |
| Children | 65–75% |
| Infants | 70–80% |
| Elderly (65+) | 45–55% |
Muscle tissue holds significantly more water than fat tissue. Therefore, fit individuals with higher muscle mass tend to have higher body water percentages. Dehydration, aging, and low physical activity can decrease your total body water.
Why Body Water Percentage Matters
Your body’s hydration status directly affects energy, mood, metabolism, and even brain performance. A healthy water balance helps:
- 💧 Maintain blood volume and circulation
- ⚡ Boost metabolism and fat oxidation
- 🧠 Improve concentration and memory
- 🏋️ Enhance muscle recovery and performance
- ❤️ Support kidney and heart function
If your Body Water Calculator results show below-average hydration, it may indicate you’re not drinking enough fluids or that your electrolyte balance needs improvement.
Tips to Maintain Optimal Hydration
- Drink 30–35 ml of water per kilogram of body weight daily.
- Eat hydrating foods like cucumbers, oranges, and watermelon.
- Avoid excessive caffeine and alcohol, which can cause dehydration.
- Track your urine color — pale yellow means good hydration.
- Use the Water Intake Calculator to plan daily water goals.
Related Health Tools
You can use the BMI Calculator or Body Fat Calculator together with this tool for a more complete picture of your health. For athletes, the VO₂ Max Calculator offers insight into endurance and oxygen efficiency.
External References
Frequently Asked Questions (FAQ)
1. What is a healthy body water percentage?
For men, between 50–65% is considered healthy, while women typically range between 45–60% due to higher fat composition.
2. Can you have too much water in your body?
Yes — overhydration can dilute sodium levels, leading to hyponatremia, which can be dangerous if not addressed promptly.
3. Does drinking more water increase body water percentage?
Drinking water improves hydration temporarily, but long-term increases depend on maintaining muscle mass and a balanced diet.
4. How does dehydration affect my body?
Dehydration reduces performance, causes fatigue, headaches, and can impact heart and kidney function.
5. How accurate is the Body Water Calculator?
It provides an estimate based on widely accepted formulas. For medical-grade results, bioelectrical impedance or DEXA scans are more precise.
Want to know your hydration status? Try the Body Water Calculator now.