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Daily Water Intake Calculator
There is no one-size-fits-all water number — but there is a sensible starting range. This calculator gives a general daily water guide from your weight and activity. Everything runs in your browser; nothing you type ever leaves this page.
General daily water guide
Includes water from food and other drinks. Spread intake through the day — do not force it all at once.
🔒 Private: all math runs in your browser. Nothing is sent anywhere, stored, or tracked.
How to actually hit it
- Start the day with a glass — overnight you lose fluid through breathing and sweat.
- Keep water visible — a bottle on your desk beats willpower.
- Drink with meals — it is the easiest habit anchor there is.
- Check the colour test: pale straw urine usually means you are hydrated; dark yellow means drink more. Clear-as-water every time can mean you are overdoing it.
- Exercise days: drink during and after training, and replace what you sweated out — do not wait until you are very thirsty.
Turn hydration into a daily habit
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See plans & free trial →Frequently asked questions
How much water should I drink per day?
A common general guide is roughly 30–35 ml per kilogram of body weight per day, plus extra for exercise and heat. For a 70 kg adult, that is about 2.1–2.5 litres. Needs vary widely with climate, activity, health conditions, and medication.
Can you drink too much water?
Yes. Drinking far more water than your body needs can dilute blood sodium (hyponatremia), which is dangerous. Do not force extreme volumes — spread intake through the day and let thirst and urine colour guide you.
Does coffee or tea count as water?
Mostly yes. Coffee, tea, and other unsweetened drinks hydrate you, and food provides roughly a fifth of daily water. Alcohol does not count — it increases fluid loss.
Is this water calculator private?
Yes. All math runs in your browser. Nothing you enter is sent anywhere, stored, or tracked.
Disclaimer: General guide, not a prescription. Needs vary with climate, activity, health conditions, and medication — follow your clinician's advice if you have kidney or heart conditions, or if you take medication that affects fluid balance.