Daily Water Intake Calculator
Find out how much water you should drink each day
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Liters per day
Proper hydration supports nearly every function in your body, but the right amount varies with your body weight and how active you are. This water intake calculator estimates your recommended daily water intake in liters (and glasses) based on your weight and daily exercise time, using a widely used hydration formula.
How to Use the Water Intake Calculator
- 1Enter your body weight in kilograms.
- 2Enter your average daily exercise time in minutes.
- 3Click Calculate Intake to see your recommended daily water in liters.
- 4Check the equivalent number of standard 250ml glasses.
Why Use This Tool
- Adjusts your target based on exercise, not just weight.
- Shows results in both liters and glasses for easy tracking.
- Simple enough to check daily without any setup.
- No account needed — just enter and go.
Frequently Asked Questions
Is this recommendation the same for everyone?
No, this is a general estimate based on weight and activity. Climate, health conditions, pregnancy, and individual needs can all change how much water you should drink — consult a doctor for personalized advice.
Does the 8 glasses a day rule still apply?
The '8 glasses a day' guideline is a simple rule of thumb, but individual needs vary considerably by body size and activity, which is why this calculator personalizes the estimate.
Do other drinks count toward this total?
This estimate is for water intake specifically; other beverages and water-rich foods also contribute to overall hydration but are not included in this calculation.