Water Intake Calculator

Enter your weight, activity level, and climate to estimate a daily hydration target that supports overall health and kidney stone prevention.

Last updated: 2026-07-09

Water supports nearly every function in the body — from circulation and digestion to temperature regulation and kidney function. Consistent hydration is one of the most important habits for kidney stone prevention.

This calculator estimates a daily fluid target for healthy adults based on body weight, activity level, and climate. Use it as a starting point, not a strict rule.

Calculate Your Water Goal

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Frequently Asked Questions

Is this water target the same for everyone?+
No — needs vary with body size, activity, climate, medications, and health conditions. This tool gives a general starting estimate for healthy adults.
Do other drinks and foods count?+
Yes. Most fluids and water-rich foods contribute to total hydration, but plain water is usually the simplest way to hit consistent targets.
Should kidney stone formers drink more?+
Many clinicians suggest stone formers aim for enough fluid to produce about 2.5 L of urine per day. Discuss your target with your doctor.
Can you drink too much water?+
Yes — overhydration is rare but possible, especially in endurance athletes. If you have heart or kidney disease, ask your doctor about a safe daily fluid limit.

Medical Disclaimer

This article is for educational and informational purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult your physician, registered dietitian, or other qualified healthcare provider with any questions you may have regarding a medical condition or dietary changes.

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