How to Use Water Intake Calculator
Estimate your recommended daily water intake from your body weight plus a bump for exercise, shown in liters, fluid ounces and cups.
Open the Water Intake Calculator tool →What is Water Intake Calculator?
Find out how much water to drink each day based on your weight and activity. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Water Intake Calculator
- Open the Water Intake Calculator tool.
- Enter your details or values.
- The result is calculated instantly.
- Copy or use the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
How is my water need estimated?
From your body weight and activity level, using common hydration guidelines.
Does food count toward hydration?
Yes — you also get water from food and other drinks, so total needs vary. Use this as a rough target.
Is it medical advice?
No — needs change with climate, health and exercise; drink to thirst and consult a professional if unsure.
Ready to try it?
Open Water Intake Calculator →