Medical Disclaimer.

This website does not provide medical advice.

All content is for general informational and educational purposes only. The calculator provides estimates — not personalised medical recommendations. Always consult a qualified healthcare professional before making decisions about your hydration or health.

The information, tools, and calculators provided on waterintakecalci.com (the "Site") are intended for general informational and educational purposes only. Nothing on this Site constitutes, or is meant to constitute, medical advice, diagnosis, treatment, or a substitute for professional medical consultation. The hydration estimates generated by our calculator are general estimates informed by publicly available health guidelines from organisations including the World Health Organization (WHO), the National Academies of Sciences (formerly the Institute of Medicine), the American College of Sports Medicine (ACSM), and the European Food Safety Authority (EFSA). These estimates are not personalised medical recommendations.

Results produced by the water intake calculator are approximations based on generalised formulas. The calculator cannot account for all the variables that affect an individual's actual hydration needs — including specific medical conditions, medications, altitude, humidity, genetic variation, or dietary water content. Your actual needs may differ substantially from the calculator's output. The calculator is not medically certified and has not been reviewed or approved by any medical regulatory body.

Before making any decisions about your hydration, diet, or health based on information found on this Site, you should consult a licensed physician, registered dietitian, or other qualified healthcare provider. This is especially important if you have or suspect you may have any condition affecting your fluid needs, including: • Kidney disease or kidney stones • Heart disease or heart failure • Liver disease or cirrhosis • Diabetes or diabetes insipidus • Hyponatremia (low blood sodium) • Adrenal insufficiency • Any condition requiring fluid restriction or specific electrolyte management And for the following groups, who have specific hydration needs that differ from general adult guidance: • Pregnant individuals — fluid requirements increase during pregnancy • Breastfeeding individuals — fluid requirements increase further during lactation • Competitive athletes and endurance sports participants • Children and adolescents • Older adults (65+) — thirst sensation diminishes with age, increasing dehydration risk • Individuals in very hot climates or high-altitude environments

Drinking excessive amounts of water can, in certain circumstances, lead to a dangerous condition called hyponatremia (low blood sodium), sometimes referred to as water intoxication. This is most commonly a risk for endurance athletes consuming large quantities of plain water without electrolyte replacement, or individuals with medical conditions affecting fluid regulation. If you experience symptoms such as nausea, headache, confusion, swelling, or seizures after consuming large quantities of water, seek emergency medical care immediately.

If you or someone you know is experiencing symptoms of severe dehydration — including confusion, loss of consciousness, rapid heartbeat, inability to urinate, or sunken eyes — seek immediate emergency medical attention. Do not rely on this website in a medical emergency. Call your local emergency services immediately.

Use of this Site does not create a doctor–patient, therapist–patient, or any other healthcare professional–patient relationship. The Site and its operators are not healthcare providers and do not practice medicine, provide diagnoses, or offer treatment.

While we make every effort to ensure the information on this Site is accurate and based on reputable published research, the field of nutritional and hydration science continues to evolve. Guidance may differ between organisations and may be updated over time. We make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability of the information, tools, or related content on the Site. Any reliance you place on such information is at your own risk.

Our calculator and educational content are informed by published guidelines and peer-reviewed research, including: • World Health Organization (WHO) — Hydration and drinking-water quality • National Academies of Sciences (formerly Institute of Medicine) — Dietary Reference Intakes for Water (2004) • American College of Sports Medicine (ACSM) — Exercise and Fluid Replacement Position Stand • European Food Safety Authority (EFSA) — Scientific opinion on dietary reference values for water • NHS (UK National Health Service) — Water, drinks and hydration guidance • Valtin H., American Journal of Physiology (2002) — Review of the "8 × 8 glasses per day" evidence Referencing these sources does not imply endorsement of this Site by any of these organisations.

We reserve the right to update this Medical Disclaimer at any time. Changes will be effective immediately upon posting to the Site. Your continued use of the Site following any changes constitutes your acceptance of the updated disclaimer.

If you have questions about this disclaimer or about the information provided on this Site, please contact us via our Contact page. However, we cannot respond to requests for personal medical advice.