How this estimate works
The calculator starts at about 33 ml per kg of body weight a day, a common rule of thumb for adults, and adds about 350 ml for every 30 minutes of exercise. Hot weather adds a little more. The result is shown in litres, fluid ounces and 250 ml cups.
Official reference values
The European Food Safety Authority (EFSA) sets adequate total water intake at 2.0 litres a day for women and 2.5 litres for men. That total includes water from food, which usually covers about 20%, so drinks make up the rest. Needs rise with heat, exercise, pregnancy and breastfeeding.
Signs you need more
Dark yellow urine, thirst, headaches and tiredness can all mean you are not drinking enough. If you have kidney, heart or liver problems, ask your doctor how much fluid is right for you.
Make it a habit
In Yumi, water tracking sits right next to your meals: one tap per cup, your daily goal always in view.
