Water Intake Calculator
Estimate how much water you should drink daily based on your weight and activity.
Daily Water Intake Calculator
Your Result
How This Estimate Is Calculated
This calculator starts from a common baseline of about 35 ml of water per kilogram of body weight, then adds extra for exercise (roughly 400-700 ml per session depending on duration) and hot or humid climates. This is a general guideline, not a medical prescription, individual needs vary with health conditions, diet, and climate.
Remember that water from food and other beverages also counts toward your total daily fluid intake.
Frequently Asked Questions
Does this count water from food and other drinks?
No, this estimates your recommended water intake specifically. Food and other beverages also contribute to your total daily fluids.
Is 'drink 8 glasses a day' accurate for everyone?
That's a rough rule of thumb that doesn't account for body weight, activity, or climate, this calculator gives a more personalized starting estimate.
Should I drink more water if I'm sick or pregnant?
Fluid needs can increase with illness, pregnancy, or breastfeeding, consult a healthcare provider for personalized guidance in those situations.