Hydration Calculator

Find out how much water to drink per day based on your weight and physical activity.

Created by: Renato Passos, Eng. de Software
Reviewed by: Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

Medical disclaimer. This tool is informational and educational. See full disclaimer

About this tool

Base: 35 mL/kg de peso corporal, recomendação da Sociedade Brasileira de Nefrologia para adultos saudáveis. Ajustes: +500 mL por hora de exercício intenso, +500 mL em dias quentes, −200 mL para idosos.

⚠️ Pessoas com insuficiência renal, cardíaca ou em uso de diuréticos devem seguir orientação médica individual.

Medical disclaimer

This tool is informational and educational. It does not constitute medical diagnosis, prescription or treatment advice, nor is it a substitute for care from a licensed physician. Input data is processed locally in your browser and is never sent to our servers, in line with HIPAA (US) and GDPR (EU) principles for health data minimization. For any health concern, consult a licensed physician (MD/DO) or your national health service. In emergencies in the US dial 911; in the EU dial 112.

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