Hydration Calculator – Find Your Ideal Daily Water Intake

Is the '8 glasses of water' rule accurate?

No, the '8 glasses of water' rule is a simple guideline but isn't personalized. Your actual daily water requirement is highly dependent on individual factors like weight, activity level, and climate, which is why a personalized calculator like this is more accurate.

Does coffee or tea count towards my daily water intake?

While non-alcoholic beverages like coffee, tea, and juice contain water and contribute to overall fluid intake, they may also contain diuretics (like caffeine). For accurate hydration tracking, it's best to prioritize plain water. For calculation purposes, this tool focuses on pure water intake.

How does climate affect my water needs?

In hot or humid climates, your body loses more water through sweating to regulate temperature. This calculator accounts for this by adding a significant adjustment to your baseline intake when you select "Hot / Humid" to compensate for increased evaporative fluid loss.

What is considered a "safe hydration range"?

The safe hydration range accounts for the typical daily variation in fluid needs. The range shown is a +/- 10% buffer around your recommended intake. If you have kidney or heart conditions, the lower end of the range is often safer, and medical advice is paramount.

Can I drink too much water?

Yes, drinking excessive amounts of water can lead to a condition called hyponatremia (low sodium levels in the blood), which is rare but serious. This is especially a risk for endurance athletes or individuals with certain health conditions (like kidney disease). This calculator provides a safe estimate, but listen to your body and consult a doctor if unsure.