Estimate a daily water intake target based on body weight using a simple guideline.
This calculator uses: Water intake ≈ 35 ml × weight (kg).
Hydration supports circulation, temperature regulation, digestion, kidney function, and overall performance. Many people look for a simple daily water target, and weight-based guidelines are a common starting point. This calculator uses an estimate of about 35 milliliters per kilogram of body weight per day. It is not a medical prescription, but it can help with planning.
Real fluid needs vary. Hot weather, intense exercise, fever, vomiting, diarrhea, pregnancy, and breastfeeding can increase requirements. Some medical conditions and medications may require fluid restriction or careful balance, especially in kidney or heart disease. Urine color, thirst, and activity level can offer practical clues, but they are not perfect measures.
If you have symptoms of dehydration, significant swelling, or a condition where fluids must be controlled, consult a qualified clinician for personalized guidance.
Does this include water from food? No. Many foods contribute water, so your drinking-water needs may be lower.
Is more always better? No. Excess water can be harmful in rare cases. Balance is important.
Should I drink the same amount every day? Needs can change with activity and environment.
This tool is for informational purposes only and should not be considered medical advice. Please consult a qualified healthcare professional for diagnosis or treatment.This tool is for informational purposes only and should not be considered medical advice. Please consult a qualified healthcare professional for diagnosis or treatment.