How Much Water Should You Drink?
Staying properly hydrated is essential for your overall health, digestion, cognitive function, and physical performance. While the common "8 glasses a day" rule is easy to remember, it doesn't account for your unique body size or how much you sweat during exercise.
This calculator uses a widely accepted rule-of-thumb formula to give you a personalized daily water intake goal based on your weight and activity level.
The Hydration Formula
Our calculator uses a two-step formula to determine your baseline and activity-adjusted hydration needs:
- Base Intake: A general guideline is to drink roughly half your body weight in ounces of water per day. For example, a 150-pound person should aim for 75 ounces of water as a baseline.
- Exercise Adjustment: Physical activity increases fluid loss through sweat. It's recommended to add 12 ounces of water to your daily total for every 30 minutes of exercise.
Other Factors to Consider
While this formula provides a solid foundation, you may need even more water if you live in a hot or dry climate, are at high altitude, are pregnant or breastfeeding, or are fighting an illness. Additionally, keep in mind that about 20% of your daily fluid intake comes from moisture-rich foods like fruits and vegetables. Always listen to your body and check the color of your urine (pale yellow is ideal) to gauge your hydration status.