Daily Hydration Calculator
Notice: This calculation is an estimate based on standard conditions. Always consult with a health professional.
Why is it important to calculate your water intake?
Water represents approximately 60% of human body weight and is vital for almost all biological functions: it regulates body temperature, transports nutrients, eliminates toxins and lubricates joints.
The recommended hydration formula
One of the most widely accepted formulas by nutrition experts to calculate basal water needs is:
*Approximately 600-800 ml should be added to this base for every hour of intense exercise due to loss through sweat.
Reference table by body weight
| Body weight | Minimum daily water | With moderate exercise |
|---|---|---|
| 50 kg | 1.75 L | 2.35 L |
| 60 kg | 2.1 L | 2.7 L |
| 70 kg | 2.45 L | 3.05 L |
| 80 kg | 2.8 L | 3.4 L |
| 90 kg | 3.15 L | 3.75 L |
| 100 kg | 3.5 L | 4.1 L |
Factors that increase your water needs
- Hot or humid climate: Sweating considerably increases fluid loss.
- Pregnancy and breastfeeding: Water needs increase by 300-700 ml daily.
- Fever: For each degree of fever, approximately 500 ml of additional fluids are lost.
- High altitude: Accelerated breathing at high altitude increases water loss.
Frequently Asked Questions about Hydration
Does coffee or tea count towards daily hydration?
Yes, infusions contribute to the daily total. Although caffeine has a mild diuretic effect, the fluid intake compensates for that effect in most people with moderate consumption (less than 4 cups a day).
Can you drink too much water?
Yes, it is known as hyponatremia or water intoxication. Drinking extreme amounts in a short time can dangerously dilute the body's electrolytes, especially sodium. It is uncommon in healthy people with normal activity levels.
Is it better to drink water in sips or all at once?
Small, frequent sips throughout the day are better. The body absorbs water more effectively when ingested continuously rather than in large amounts at once. Drinking a glass upon waking is especially beneficial as the body has gone hours without hydration.
Do fruits and vegetables count as hydration?
Yes. Foods like cucumber, watermelon, lettuce, or tomato contain between 90% and 97% water. While they do not replace plain water, they contribute significantly to total daily hydration.