The water intake calculator estimates how much water to drink per day in milliliters and cups from body weight (kg) and activity level, with a simple cup visual for quick comparison.
How to use
- Enter your weight in kilograms.
- Pick the activity tier that matches an average week.
- Read daily ml, approximate cups (~240 ml per cup), and the cup graphic.
What the estimate means
Base intake uses about 33 ml per kg per day, plus fixed bumps for moderate, active, and very active lifestyles. Heat, nursing, heavy sweating, or clinician orders may require more—this page does not replace medical fluid guidance.
Example
70 kg, moderate activity → about 70×33+350 ≈ 2,660 ml/day, roughly 11 cups (rounded; changes with inputs).
Hydration is separate from calories—pair with the calorie calculator or TDEE calculator if you are planning weight goals.
More tools on the health hub. For planning reference only—not medical, nutrition, or obstetric advice.
Frequently asked questions
How much water should I drink per day?
There is no single cup count for everyone. We estimate ml and cups from weight and activity (~240 ml per cup). Nursing, heat, illness, or clinician orders may require different targets.
How do I enter weight and activity?
Use kilograms for weight. Pick the tier that matches an average week—not a one-off long walk unless you are rough-guessing a heavy day.
Are the cup counts exact?
Cups are a convenience conversion; mugs and bottles vary. Treat milliliters as the primary number.
Does water intake affect weight loss?
Hydration supports habits and exercise but does not directly drive fat loss. Pair with the calorie calculator or TDEE calculator for intake targets.
Do tea, coffee, or soup count?
This page models total fluid reference, not water-only. Adjust for caffeine, sugar, or medical fluid limits as needed.
Is this medical advice?
No—results are for planning reference only. See clinicians for pregnancy, pediatrics, cycle disorders, or sleep conditions. Do not rely on calendar math alone for contraception.