Daily Water Intake Calculator
Estimate daily water intake from body weight.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Daily Water Intake Calculator
How to use this tool
- Enter body weight in kilograms.
- Press Generate to see the daily estimate in millilitres and litres.
- Use Load sample for 70 kg, or Clear to start again.
Worked example
At 70 kg, 70 times 35 ml gives 2,450 ml per day, which is 2.45 litres.
What this tool does not do / Limits
This is a general estimate only, about 35 ml per kilogram of body weight, and is not medical advice and not a personal medical recommendation. Real needs vary with heat, exercise, health conditions and medical guidance, so follow a clinician's advice where it differs.
Frequently asked questions
Does this include water from food?
The figure is a general total-water guide, not a drinking-only target. Food, drinks and soups all contribute, so the amount to drink is usually less than the total.
Should children use this figure?
No. The 35 ml per kilogram guide is a general adult planning figure. Children's needs differ and should follow medical guidance.
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