Daily Water Intake Calculator
Hydrate to a number, not a guess.
Daily Water Intake Calculator
Water (L) = Weight (kg) x 0.033 + Activity adjustment
Calculated instantly
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What This Calculator Does
The Daily Water Intake Calculator estimates how much fluid your body needs based on weight and activity. It converts the recommendation into liters and fluid ounces so the goal is easy to track.
How It Works
The baseline recommendation scales at 33 milliliters per kilogram of body weight, with an extra 350 milliliters per 30 minutes of activity. This aligns with common clinical guidance of 2-3 liters for most adults.
Example
A 70 kg adult who exercises 45 minutes daily targets about 2.31 + 0.53 = 2.84 liters, roughly 96 fluid ounces.
Formula
Water (L) = Weight (kg) × 0.033 + (Activity min / 30) × 0.35Baseline scales to body weight with an activity adjustment.
Reading the Results
Daily Water Target
The recommended daily fluid intake in liters, scaled to your weight plus a bonus for exercise.
Frequently Asked Questions
How much water should I drink a day?
Common guidance is about 2 liters for women and 3 liters for men, adjusted for weight, activity, heat, and health conditions.
Does coffee and tea count toward water?
Mostly yes. While caffeine has a mild diuretic effect, the fluid in coffee and tea still contributes to daily hydration.
Can I drink too much water?
Excess water is rare but possible and can dilute blood sodium. Very high intakes far above the target are unnecessary.