Water Intake Calculator
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How much water should you drink?

Five short questions about you, your body, your day and the weather – and you’ll know your personal target.

5 QUESTIONS · UNDER 1 MINUTE · FREE
HOW WE CALCULATE

Five factors, one target.

Not a one-size-fits-all number, but a calculation you can follow. Every factor is listed separately in your result.

Age & weight22 to 85 ml per kilo depending on age. Children need far more per kilo than adults.22–85 ml / kg
Hydration & sweatUrine colour and sweating show how full your tank is right now.+ 30–250 ml
SportAbout 200 ml per 25 minutes – more at high intensity.200 ml / 25 min
WeatherThe season always counts; above 20 °C every degree adds up.+ 30 ml / °C
ExtrasFrequent headaches or wanting to lose weight.+ 200–250 ml
≈ 60 %

That’s how much of your body is water.

A little more or less depending on age and build. Thirst often kicks in only once water is already missing – and drinking easily gets lost in a busy day.

READ ON

More about water

Water facts →
Image: glass of waterWATER FACTS5 benefits of waterWhat drinking enough does for your head, skin and energy.Image: carafeWATER FACTSYour fluid needsWhat they depend on – and which drinks count.Image: mealWATER FACTSLosing weight with waterWhy a glass before meals can help.Image: colour scaleSTAY HYDRATEDRead your hydration levelThe simplest test costs nothing.
FAQ

Frequently asked

How much water should I drink per day?

For adults the target is usually between 1.5 and 3 litres. Weight, activity and temperature shift it noticeably – that’s why we calculate it personally.

Do I need to drink more if I do a lot of sport?

Yes. Depending on intensity you lose 0.3 to 1 litre of sweat per half hour of training. Drink before, during and after.

Do I need to drink more in summer than in winter?

In the heat, yes. But dry heating air also costs water, and cold dampens thirst – so don’t ease off in winter.

Do coffee and tea count?

Yes, in normal amounts they count towards your fluid balance. Sugary drinks and alcohol shouldn’t be counted.