Calculate your daily water intake needs based on body weight and activity level.
Advertisement
Enter Your Measurements
Results
Daily Water Intake
75
oz
Advertisement
Formula
Water = (Weight / 2) × Activity Multiplier (ounces)
How to Use This Calculator
How to Use
- 1
Enter your body weight.
- 2
Select your activity level.
- 3
Get your recommended daily water intake.
Frequently Asked Questions
Frequently Asked Questions
Is the 8x8 rule accurate?
The 8x8 rule (8 glasses of 8oz) is a general guideline. Individual needs vary based on weight, activity, climate, and diet.
What if I don't like plain water?
Water from foods (fruits, vegetables) and other beverages counts toward hydration, though water is best.
Advertisement
Related Calculators
Related Calculators
About This Calculator
This calculator uses the formula: Water = (Weight / 2) × Activity Multiplier (ounces). 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.
▶Embed this calculator on your website
Copy and paste this code into your page:
<iframe src="https://calcsmart.io/embed/water-intake-calculator" width="100%" height="520" frameborder="0" style="border-radius:8px;border:1px solid #e5e7eb" title="Water Intake Calculator"></iframe>Free to embed. Attribution link included automatically.