Find out exactly how much water you should drink each day. This calculator factors in your body weight, activity level, and environment to give you a personalized daily hydration target.
Enter Your Measurements
Results
Daily Water Target
108
oz
Daily Water Target
3.2
liters
8 oz Cups Per Day
14
cups
Formula
How to Use This Calculator
How to Use
- 1
Enter your body weight.
- 2
Select your typical activity level.
- 3
Select your climate/environment.
- 4
Drink the recommended amount spread throughout the day.
Frequently Asked Questions
Frequently Asked Questions
Does the 8 glasses a day rule apply to everyone?
Does coffee and tea count toward daily water intake?
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About This Calculator
This calculator uses the formula: Base = Weight (lbs) × 0.5 oz; Activity add: Moderate +12oz, Active +24oz; Climate add: Warm +8oz, Hot +16oz. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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