About WaterDailyGoal
A calm, fast tool for one small question: how much water should you drink today?
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Maya Renner
Hydration & nutrition writer
Maya Renner researches everyday hydration and translates the science from the U.S. National Academies, EFSA, and the Mayo Clinic into plain, practical guidance.
Why this exists
Most hydration advice is either a vague “drink 8 glasses” rule or a wall of medical text with no actual number. We wanted the opposite: a tool that takes your weight, activity, and climate and gives you a clear, honest target in seconds — then explains the maths instead of hiding it.
Our principles
- Honest, not medical. We give friendly estimates for healthy adults and point you to professionals for anything clinical.
- Transparent. The formula and sources are public. We cite the U.S. National Academies, EFSA, and the Mayo Clinic — and tell you when the science is uncertain.
- Private & free. No signup, no ads chasing you, no data leaving your device. The calculator runs entirely in your browser.
- Useful over flashy.Every page should answer a real question better than the alternatives, or it doesn't ship.
Get your personal number
Plug in your weight, activity, and climate for a daily goal made for you.