Calculate Baseline Intake
70kg, moderate activity
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Average Adult
70kg, moderate activity
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Active Athlete
80kg, intense training
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Pregnant Woman
65kg, second trimester
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Elderly Adult
65kg, sedentary lifestyle
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Hot Climate Worker
75kg, outdoor work
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Quick Profiles
Select a profile to get started:
Average Adult
70kg, moderate activity
Active Athlete
80kg, intense training
Pregnant Woman
65kg, second trimester
Elderly Adult
65kg, sedentary lifestyle
Hot Climate Worker
75kg, outdoor work
Personal Information
Lifestyle Factors
Special Considerations
Your Daily Water Intake
3.3 L
(14 cups / 112 oz)
2658 mL
Minimum
3322 mL
Target
3986 mL
Maximum
Hydration Tips
- Carry a reusable water bottle and refill throughout the day
- Set hourly reminders to drink water
- Drink a glass of water before each meal
- Eat water-rich foods (cucumbers, watermelon, oranges)
Hydration Analysis
Intake Sources
Daily Distribution
Suggested Hydration Schedule
| Time | Amount | Reason |
| 7:00 AM | 500 mL (2 glasses) | Rehydrate after sleep |
| 9:00 AM | 250 mL | Mid-morning hydration |
| 11:00 AM | 250 mL | Before lunch |
| 1:00 PM | 500 mL | With/after lunch |
| 3:00 PM | 250 mL | Afternoon energy |
| 5:00 PM | 250 mL | Pre-dinner |
| 7:00 PM | 250 mL | With dinner |
| 9:00 PM | 250 mL | Evening (limit to avoid nighttime waking) |
How We Calculated This
Step 1: Calculate Baseline Intake
Formula: ext{Baseline} = ext{Weight} ( ext{kg}) imes 30-35 ext{mL}/ ext{kg}
Calculation: Baseline = 70 × 33 mL/kg
Result: 2310 mL/day
Step 2: Apply Activity Adjustment
Formula: ext{Activity} ext{Adjusted} = ext{Baseline} imes ext{Activity} ext{Multiplier}
Calculation: Activity Adjusted = 2310 × 1.2
Result: 2772 mL/day
Step 3: Final Recommended Intake
Formula: ext{Total} = ext{Sum} ext{of} ext{all} ext{adjustments}
Calculation: Total = 3322 mL
Result: 3322 mL/day (14.0 cups)
Why is Proper Hydration Important?
Water makes up about 60% of your body weight and is essential for virtually every bodily function. Proper hydration supports digestion, nutrient absorption, circulation, temperature regulation, cognitive function, and joint lubrication.
Brain Function
Even mild dehydration (1-2%) can impair concentration, mood, and short-term memory.
Physical Performance
Losing just 2% of body weight in fluid can decrease endurance and strength by up to 25%.
Heart Health
Adequate hydration helps maintain blood volume and supports cardiovascular function.
Signs of Dehydration
Mild Dehydration
- • Thirst
- • Dry mouth and lips
- • Dark yellow urine
- • Decreased urine output
- • Mild headache
- • Fatigue
Severe Dehydration (Seek Medical Help)
- • Extreme thirst
- • Very dark urine or no urination
- • Dizziness or confusion
- • Rapid heartbeat
- • Sunken eyes
- • Fainting
Daily Water Intake Recommendations
| Age Group | Males | Females | Notes |
| Children 4-8 yrs | 1.2 L (5 cups) | 1.2 L (5 cups) | All beverages count |
| Children 9-13 yrs | 1.8 L (8 cups) | 1.6 L (7 cups) | Increase during activity |
| Teens 14-18 yrs | 2.6 L (11 cups) | 1.8 L (8 cups) | Higher during growth spurts |
| Adults 19-50 yrs | 3.7 L (16 cups) | 2.7 L (11 cups) | IOM recommendation |
| Adults 51+ yrs | 3.7 L (16 cups) | 2.7 L (11 cups) | Thirst sense may diminish |
| Pregnant Women | - | 3.0 L (13 cups) | Support blood volume expansion |
| Breastfeeding | - | 3.8 L (16 cups) | Replace fluid in breast milk |
* Based on Institute of Medicine (IOM) adequate intake recommendations. Individual needs vary.
When You Need More Water
Exercise
Add 350-500mL per 30 minutes of moderate exercise. For intense/endurance activity, consider electrolyte replacement.
Hot Weather
Increase intake by 500-1000mL in temperatures above 30°C (86°F). Watch for excessive sweating.
High Altitude
Above 2,500m (8,200ft), increase fluids by 1-1.5L daily due to increased respiratory water loss.
Fever/Illness
Add 200-500mL for each degree of fever. Vomiting and diarrhea require extra fluid and electrolytes.
Air Travel
Cabin humidity is very low (10-20%). Drink 250mL per hour of flight to prevent dehydration.
Caffeine/Alcohol
While moderate caffeine hydrates, alcohol is dehydrating. Drink water alongside alcoholic beverages.
Water Content in Foods
| Food | Water Content | Category |
| Cucumber, Lettuce | 95-96% | Vegetables |
| Watermelon, Strawberries | 91-92% | Fruits |
| Oranges, Peaches | 88-89% | Fruits |
| Yogurt, Cottage Cheese | 80-85% | Dairy |
| Rice, Pasta (cooked) | 65-70% | Grains |
| Chicken, Fish (cooked) | 60-65% | Protein |
| Bread | 35-40% | Grains |
| Nuts, Crackers | 1-5% | Dry Foods |
* About 20% of daily water intake typically comes from food
Water Intake Formulas
1. Weight-Based Formula
Standard formula: 30-35mL per kg of body weight
2. Activity Adjustment
Replace fluid lost through sweat during physical activity
3. The 8×8 Rule (Simplified)
Easy to remember but may not fit everyone's needs
Frequently Asked Questions
Can you drink too much water?
Yes, drinking excessive water can lead to hyponatremia (low blood sodium), which is dangerous. Stick to recommended amounts and spread intake throughout the day.
Do other beverages count toward water intake?
Yes, most beverages contribute to hydration, including coffee and tea despite their caffeine content. However, water is the best choice as it has no calories or additives.
How do I know if I'm drinking enough?
Check your urine color - pale yellow (like lemonade) indicates good hydration. Dark yellow or amber suggests you need more fluids. Also, you shouldn't feel thirsty often.
Should I drink water even if I'm not thirsty?
Yes, especially if you're older, exercising, or in hot weather. Thirst is a late indicator of dehydration. By the time you feel thirsty, you may already be mildly dehydrated.
Hydration Tips
Morning Hydration
Drink 1-2 glasses of water when you wake up to rehydrate after 7-8 hours without fluids.
Before Meals
Drinking water 30 minutes before meals aids digestion and may help with weight management.
Exercise Hydration
Drink before, during (every 15-20 min), and after exercise. Weigh yourself to track fluid loss.
Evening Limit
Reduce intake 2 hours before bed to minimize nighttime bathroom trips and improve sleep.
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
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