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Water Intake Calculator
Estimate how much water to drink each day from your weight, activity and climate.
Drink about
How it’s estimated: about 35 ml per kg of body weight, plus roughly 350 ml for every 30 minutes of exercise and extra for hot weather, pregnancy or breastfeeding. That total includes water from food and other drinks — around a fifth usually comes from food. Pale yellow urine is a good sign you’re drinking enough. People with kidney or heart conditions should follow their doctor’s advice.
About the Water Intake Calculator
The Water Intake Calculator estimates how much water to drink each day from your body weight, daily exercise and climate, with extra for pregnancy or breastfeeding. It shows the answer in litres, 250 ml glasses, US fluid ounces and 500 ml bottles, so staying hydrated is easy to plan.
How to use the Water Intake Calculator
- Enter your weight in kg or lb.
- Enter how many minutes you exercise each day.
- Choose your climate and any other factors.
- Read how much to drink in litres, glasses, ounces and bottles.
Frequently asked questions
How much water should I drink a day?
A common estimate is about 35 ml per kg of body weight — around 2.5 litres for a 70 kg adult — plus more when you exercise or it is hot.
Does coffee or tea count towards water intake?
Yes. Most drinks count, and around a fifth of daily water usually comes from food.
How do I know if I am drinking enough?
Pale yellow urine and rarely feeling thirsty are good signs you are well hydrated.