Daily Water Intake Calculator
Based on your profile, your estimated daily water goal is:
*This includes water from all beverages and food sources. Approximately 20% of intake usually comes from food.
How Much Water Should You Drink Daily?
Staying hydrated is essential for nearly every bodily function, from regulating temperature to lubricating joints and flushing out waste. While the "8 glasses a day" rule is a popular benchmark, actual hydration needs vary significantly based on individual factors.
The Hydration Formula Used Here
Our calculator utilizes a scientifically-backed baseline combined with activity adjustments. The core logic follows these principles:
- Base Intake: Roughly 30ml to 35ml of water per kilogram of body weight.
- Exercise Adjustment: For every 30 minutes of vigorous exercise, you should add approximately 350ml (12 oz) of water to compensate for sweat loss.
- Environmental Factors: High temperatures or humidity increase perspiration, requiring an additional 500ml or more.
If you weigh 180 lbs (81.6 kg) and exercise for 60 minutes in a hot climate:
1. Base: 81.6kg × 35ml = 2,856ml
2. Exercise: 60 mins = +700ml
3. Climate: Hot = +500ml
Total: 4.05 Liters per day.
Signs of Dehydration
If you aren't meeting your daily water intake goals, you might notice:
- Dark yellow or amber-colored urine.
- Dry mouth and persistent thirst.
- Fatigue or unexplained headaches.
- Dizziness or lightheadedness.
Tips to Reach Your Daily Goal
If you find it difficult to drink enough water, try carrying a reusable bottle, flavoring your water with fresh fruit slices (lemon, cucumber, or berries), or using a mobile app to set reminders throughout the day.