About
About Ideal Water Intake
Ideal Water Intake is a free, browser-based water intake calculator that turns hydration guidelines into one clear, personal number — no sign-up, no app install, no guesswork.
Our mission
Most people have heard the "8 glasses a day" rule — and most people it doesn't fit. Our mission is to replace generic hydration advice with a personalized daily target, grounded in published EFSA and ACSM guidance and transparent about how the number is derived.
What we do
We build simple, fast tools for everyday health decisions. The water intake calculator considers your weight, height, age, sex, activity level, exercise, climate, and life stage — then returns your recommended daily water intake in liters, ounces, glasses, and bottles in real time.
Our approach
Every calculation follows a documented method: start from the EFSA reference values, scale by body size, add lifestyle factors, and compare against what you already drink. No vague rules, no paid tiers — the full method is published on the homepage.
Privacy first
Your data never leaves your device. All calculations run in your browser; we don't require an account, and nothing you enter is stored on our servers. See our privacy policy for details.
Get in touch
Questions, corrections, or partnership ideas? We'd love to hear from you at hello@idealwaterintake.com.