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Water intake calculator
Estimate how much water you need a day from your weight, today's exercise and the heat. The water intake calculator gives litres or fluid ounces, shows how much should come from drinks, and compares it with the EFSA reference for adults. Free and online.
How to calculate your daily water intake
- 1Enter your weight
- 2Add today's exercise in minutes
- 3Tick the box if it is hot
- 4Read your daily total and the drinks part
- Your daily water, from drinks, in glasses or cups.
What you get
- A total and a drinks share.About 80 % of your water is counted as coming from drinks, the rest from food.
- Glasses or cups.The drinks part is also shown as glasses of 250 ml, or cups of 8 fl oz in imperial units.
- Nothing is sent.The sums run in your browser.
What you can do
- Calculate from your weight in kg or lb: 35 ml per kg.
- Add 0.5 l for every hour of exercise you did today.
- Add 0.5 l for hot weather or a hot place.
- Compare the result with the EFSA reference for adults: 2.5 l for men and 2.0 l for women.
Good to know
- The total is water from all sources, food included. Only about 80 % has to come from drinks.
- It is an estimate. Heart or kidney conditions can call for less water, so ask your doctor.
- Exercise minutes can be from 0 to 1,440.
Questions
How much water should I drink a day?
The tool counts 35 ml per kg of body weight. At 70 kg that is about 2.5 l in total, of which about 2 l from drinks.
Does coffee or tea count?
The tool counts all drinks as the "from drinks" part, without separating the types.
Should I drink more when I exercise?
Yes. The tool adds 0.5 l per hour of exercise and another 0.5 l in hot weather.
Is my data stored?
No. It stays in your browser and is not sent.