💧 Water Intake Calculator
Calculate your daily water intake needs
How Water Intake Calculation Works
Formula
Base Intake = Body Weight (lbs) × 0.5 oz (or kg × 33 mL)
- 1Enter your body weight and select units.
- 2Select your activity level (sedentary to very active).
- 3The base recommendation is calculated from body weight.
- 4Adjustments are made for exercise, climate, and other factors.
- 5The result shows daily intake in ounces, liters, and cups.
About Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity level, and climate. Get personalized hydration recommendations backed by health guidelines.
Frequently Asked Questions
Is 8 glasses a day enough?
The '8 glasses' rule (64 oz) is a simplified guideline. Actual needs vary by weight, activity, and climate. A 200-lb active person may need 100+ oz while a 120-lb sedentary person may need only 60 oz.
Does coffee count toward water intake?
Yes, moderate coffee and tea consumption contribute to daily hydration. While caffeine is a mild diuretic, the water content more than compensates. However, pure water remains the best hydration source.
How do I know if I'm dehydrated?
Check your urine color — pale yellow means well-hydrated, dark yellow indicates dehydration. Other signs include thirst, dry mouth, fatigue, dizziness, and headaches.