Daily Water Intake Calculator
Estimate how much water to drink each day based on weight, activity and climate.
To estimate daily water intake, enter your weight, typical exercise duration and climate. The calculation starts from about 35 millilitres per kilogram of body weight and adds roughly 350 millilitres for every 30 minutes of exercise, adjusted for hot or cold conditions.
Runs in your browser- Privacy
- Runs entirely in your browser — nothing is uploaded
- Cost
- Free, unlimited, no sign-up
Frequently asked questions
Is eight glasses a day actually right?
How to use the daily water intake calculator
- 1Choose the units.
- 2Set the weight.
- 3Set the daily exercise.
- 4Choose the climate.
- 5The result appears immediately — copy or download it.
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