How much water should you drink a day?
30 ml for every kilo you weigh, not a flat two litres for everybody. Enter your weight and get your day in litres and glasses — the rule the Healthness app sets your water goal with.
Water a day
2.1 l
about 8 glasses of 250 ml
Why it matters
Energy and focus
Even mild dehydration is commonly linked to tiredness, headaches and a harder time concentrating. A glass of water is the easiest thing to try first.
It carries a fast
Between meals, water is the one thing you have freely. A full glass in the morning is part of the day the app is built around.
Sized to you
Someone at 55 kg and someone at 95 kg don’t need the same amount. A flat two litres is too much for one and too little for the other.
Healthness keeps count for you.
The goal comes from your weight and moves with it. A glass is one tap — 200, 250, 330, 500 or 750 ml — and water sits beside movement on the home screen: the two things you can win during a fast.
Is Healthness medical advice? No. It is an educational tracking tool. Fasting is not right for everyone — if you are pregnant, diabetic, on medication, or have a history of disordered eating, talk to your doctor before changing how you eat.