Water Intake Calculator
Instantly estimate how much water you need to drink per day based on your body weight, activity, and climate.
100% privacy-safe, modern Multi Tools design, SEO optimized, mobile-friendly, and downloadable!
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About the Water Intake Calculator
The Water Intake Calculator by Multi Tools is a fast, mobile-optimized way to determine the right hydration target for you. This tool serves water intake calculator, daily hydration estimator, and how much water per day searchers for top SEO results and clarity.
How is my daily water need calculated?
- Recommended base is 35 ml per kg body weight (e.g. 68 kg → 2.38 L).
- Activity and climate may add 0.2-1 extra liters to base; sweatier and more active you are, the more you need.
- Get your daily minimum, an ideal goal, and download your personal hydration plan—private, no data kept.
* Calculation: (Weight × 0.035) + Activity + Climate (all in Liters). Example: 70 kg, active, warm = 2.45 L + 0.5 + 0.2 = 3.15 L/day.