Water Intake Calculator
Estimate how much water you should drink per day based on your weight, activity level, and climate. This is a simple guideline, not medical advice.
Calculator
Base guideline: ~35 ml per kg body weight. We adjust for activity & heat.
Your daily water target
Hydration needs vary. If you're pregnant, breastfeeding, ill, or have kidney/heart conditions, consult a medical professional.
FAQ
How accurate is this calculator?
It's a practical guideline based on body weight with simple adjustments for activity and heat.
Does coffee or tea count?
They contribute to fluid intake, but water is still the best baseline for hydration.
What if I exercise a lot?
If you sweat heavily, you may need extra fluids and electrolytes. Use the "Active" setting as a baseline.
Is it bad to drink too much water?
Yes—extreme overhydration can be dangerous. Spread intake across the day and drink to thirst.