Daily Water Intake
How much fluid to aim for each day, adjusted for your weight, activity and climate.
✓ Reviewed by Dr. Poonam Sekhon Chahal · 24 May 2026
How this is calculated
Starts from ~30–35 mL per kg of body weight, then adds for activity and hot climates. About 20% of fluid comes from food, so the 'from drinks' target is ~80%.
Sources
This calculator is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. The result is based on standard clinical formulas applied to the values you entered — your individual situation may need adjustments your doctor can make. Never disregard professional medical advice or delay seeking it because of something you read or calculated on healthcalculus.