A simple daily guide
Daily Water Intake.
A gentle estimate of how much water suits your body and your day. A general guide to sip through the day — not a strict target.
Your weight
How active are you today?
What's the weather like?
A general guide for healthy adults, based on common rules of thumb. Food and other drinks add to your intake too. If you're pregnant, breastfeeding, have a kidney, heart, or other medical condition, or take medication that affects fluids, follow your doctor's advice rather than this estimate. Thirst and pale-yellow urine are your best everyday signals.
Little habits, gently kept
Hydration is one small act of self-care among many. Our free journal helps a few kind habits stick — without the pressure of perfect streaks.
Get the free journalA daily water intake calculator estimates how much water you should drink based on your body weight and how active you are. Enter your details and this free tool gives you a simple daily target in glasses or litres.
The U.S. National Academies suggest about 3.7 litres of total water a day for men and 2.7 litres for women, from all food and drink combined — link the National Academies guidance.
How much water should I drink a day?
A common guide is roughly 2.7–3.7 litres of total water from all sources, adjusted for weight, activity and climate. The calculator personalises this.
Do tea, coffee and food count toward water intake?
Yes. Most drinks and many foods contribute to total water, though plain water is the simplest way to top up.
How does the water intake calculator work?
It takes your weight and activity level and applies a standard per-kilogram estimate to suggest a daily target.
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