Water Intake Calculator
Estimate how much water to drink each day from your weight and activity level, shown in liters, ounces and cups.
Estimate how much water to drink a day from your body weight and activity level, shown in litres, ounces and cups. This water intake calculator gives a simple daily hydration target and adjusts for the exercise you do, so heavier and more active days ask for more.
Read the guide: How Much Water Should You Drink a Day?Your details
Daily water target
2.8 L
About 12 cups
- In ounces
- 95 oz
- In cups
- 12 cups
A general guide — needs rise with heat, illness and pregnancy, and some comes from food. Don't over-drink. Informational only, not medical advice.
How it works
- 1
Enter your weight
Add your body weight in metric or imperial.
- 2
Add exercise
Include your typical daily exercise minutes.
- 3
See your target
View your daily water goal in your preferred units.
Instant & 100% private — nothing is uploaded
Every calculation runs locally in your browser. The measurements, dates and details you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.
Frequently asked questions
- Does all fluid count?
- Yes. Water, other drinks and the water in food all contribute. The target here is a general guide for total intake, not water alone.
- Can you drink too much water?
- Rarely, but yes. Drinking far more than you need can dilute your blood sodium. Let thirst and urine colour guide you, and don't force large amounts.
- How do I know if I am drinking enough?
- Pale yellow urine and rarely feeling thirsty are good signs you are on track. Dark urine, headaches or a dry mouth suggest you could drink more.
Important
These calculators give general, informational estimates and are not medical advice, diagnosis or treatment. Everyone is different — for decisions about your health, talk to a qualified clinician.
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