Daily Water Intake Calculator

Find your optimal daily water intake for better health and energy

Co-authored by Caroline Heiderscheit

Last Updated: January 15, 2026 Fact Checked

Are you drinking enough water? Staying hydrated is key for energy, brain function, and overall health, but the right amount isn't the same for everyone. Tell us a little about yourself, and we'll give you a personalized recommendation to help you stay optimally hydrated.

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A person with short hair drinking a glass of water.

Why Staying Hydrated Matters for Your Health

Water isn't just a thirst-quencher; it's a vital component for almost every bodily function. From regulating body temperature to transporting nutrients and lubricating joints, proper hydration is fundamental to your health and well-being. Ignoring your water intake can lead to fatigue, headaches, poor concentration, and even more serious health issues.

Make sure you stay hydrated with these tips and tricks:

Ready to optimize your daily water intake? Use the calculator above to get a personalized recommendation and start feeling the benefits of proper hydration! Or, if you'd rather read a brief overview, we're walking you through the basics below.

How much water does a person need? Generally, 15.5 cups of water per day is recommended for men and 11.5 cups of water per day is recommended for women. However, factors like activity level, daily medications, diet, age, and environment can raise or lower the ideal amount of water that an individual should drink in a day. For example, if you have a higher activity level, you need to increase your water intake.