Tool
Water Intake Calculator
A simple daily fluid estimate from body weight (about 30–35 ml per kg). Heat, exercise, and medical conditions change needs.
How this estimate is made
This is a starting point, not a hydration prescription. Climate, exercise, and illness matter more than a single number.
See the medical disclaimer. Track a plan in the Fitkyn app. Browse all tools or health guides.
Frequently asked questions
Is this medical advice?
No. Results are population estimates. Discuss medical conditions, pregnancy, eating disorders, or medications with a qualified healthcare professional.
Why might my number differ from another site?
Equations, activity factors, and rounding differ. Treat every calculator as a sketch.
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