Hydration
Water Intake Calculator
A practical daily hydration target based on body weight and activity level.
What your result means
Use this as a guide. In hot weather or hard training, sweat losses can add another litre or more.
How we calculate this
Approximately 33 ml per kg of body weight, plus 350 ml per 30 minutes of exercise.
Limitations
Healthy adults can largely trust their thirst signal. This calculator is most useful for athletes, older adults, and people who forget to drink.
Frequently asked questions
Related calculators
Related guides
References
- World Health Organization. https://www.who.int
- NHS — Health A to Z. https://www.nhs.uk
- Centers for Disease Control and Prevention. https://www.cdc.gov
Browse all calculators or read our evidence-based guides.