Your Daily Water Intake Calculator
Estimate how much water you should drink each day based on your weight, exercise and climate. Results in litres, ounces and glasses.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Daily Water Intake Calculator with sample data entered and the result showing.
What is the Daily Water Intake Calculator?
Water makes up around 60% of the adult body and supports digestion, temperature control, joints and concentration. How much you need depends on your body size, how active you are and the weather. A common guideline is about 30–35 ml per kilogram of body weight, plus extra for exercise and heat.
Enter your weight, the minutes of exercise you do per day and the climate you live in, and this calculator gives a personalised daily target in litres, US ounces and standard 250 ml glasses. It is a helpful reminder to build a hydration habit — not a medical prescription.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Based on your weight, activity and climate.
Litres, fluid ounces and 250 ml glasses.
Adds water for every 30 minutes of activity.
No account needed.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How much water should I drink a day?
About 30–35 ml per kg of body weight, more with exercise or heat — commonly 2–3 litres.
Do coffee and tea count?
Yes, they contribute to fluid intake, though water is best.
Can you drink too much water?
Yes, though it is rare; do not exceed what a doctor advises.
Does exercise change the amount?
Yes, add roughly 350 ml for every 30 minutes of exercise.
Is this medical advice?
No, it is a general estimate.
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