Daily Water Intake Calculator
Calculate how much water you should drink daily based on weight and activity level. Free hydration calculator.
Frequently asked questions
- How is my daily water target calculated?
- It starts from 33 ml per kilogram of body weight, multiplies by a climate factor, and adds about 350 ml for every 30 minutes of exercise.
- What does the climate setting change?
- Choosing hot or humid conditions multiplies the base amount by 1.15, since you lose more fluid through sweat in warm weather.
- How many glasses is that?
- The result is also expressed in 250 ml glasses, which is easier to track through the day than liters.
- Is this amount right for everyone?
- It is a general guideline. Illness, pregnancy and some medications change fluid needs, so ask a doctor if you have a medical condition.
This tool runs entirely in your browser. No data is uploaded anywhere.