Water Intake Calculator
Estimate how much water you should drink daily.
Result
Results are estimates for general information only and are not professional advice.
Staying hydrated
A common guideline is roughly 30–35 ml of water per kilogram of body weight, plus extra for exercise. This calculator gives a personalised daily estimate. Needs rise in hot weather, during illness and with intense activity.
Frequently Asked Questions
What is the Water Intake Calculator?
Estimate how much water you should drink daily. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Water Intake Calculator?
The Water Intake Calculator asks for the following values (2): Weight (kg), Exercise (minutes/day). Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Water Intake Calculator?
The Water Intake Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Water Intake Calculator free, and do I need an account?
Yes. The Water Intake Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.