Daily Water Intake Calculator
Calculate your daily hydration needs using both European (EFSA) and American (IOM) standards. Get personalized recommendations based on age, activity, and conditions.
Patient Information
Water Intake Result
Complete the form to view your calculation
EFSA vs IOM Standards
European (EFSA) and American (IOM) standards differ by 20-30%. IOM generally recommends higher intake, especially for men. Both are scientifically validated.
Understanding Hydration
About 20% of daily water comes from food. Monitor urine color - pale yellow indicates good hydration. Thirst is a late indicator of dehydration.
Clinical Considerations
Individual needs vary based on age, activity, climate, and health conditions. Pregnancy and lactation significantly increase fluid requirements.
Standards Used
EFSA (2010)
European Food Safety Authority guidelines for adequate water intake
IOM (2005)
Institute of Medicine dietary reference intakes for water
Medical Reference
Gandy, J. (2015). Water intake: validity of population assessment and recommendations. Eur J Nutr 54 (Suppl 2): 11–16.
View Publication DOIDr. Beltrán J.F.