💧Water Intake Calculator
How much water to drink per day.
Disclaimer: These tools are for general information and educational use only and are not medical advice, diagnosis or treatment. Individual health needs vary. Always consult a qualified doctor or healthcare professional before making health decisions.
About the Water Intake Calculator
Estimate how much water you should drink each day based on your weight and activity level, in litres and glasses. Free daily water intake calculator. General guidance, not medical advice.
How to use the Water Intake Calculator
- 1Enter your details (such as height, weight or age) into the Water Intake Calculator.
- 2Pick your preferred units and any relevant options.
- 3Read your estimated result and the guidance shown below it.
- 4Results are indicative only — always consult a professional for medical decisions.
Why use this tool?
Private by design
The Water Intake Calculator runs entirely in your browser — nothing you enter is uploaded to a server.
Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
How much water should I drink?＋
As a general guide, about 35 ml per kg of body weight plus extra for exercise. Needs vary with climate and health — this isn't medical advice.