Health tool
Water Intake Calculator
Estimate daily water intake from weight, activity, and climate for general hydration planning.
water intake calculatorhow much water to drink a day calculatorhydrationhealth
How To Use Water Intake Calculator
Quick notes to help you understand the result before you act on it.
Overview
Use this water intake calculator to estimate how much water to drink a day based on body weight, activity, and climate.
The result is a general hydration estimate and should be adjusted for health conditions and professional advice.
Water Intake Estimate
- Base estimate uses about 35 ml per kg of body weight.
- Activity adds a small extra allowance per active minute.
- Hot climate adds an additional adjustment.
Practical Tips
- Hydration needs vary by health, sweat rate, diet, and weather.
- Do not force excessive water intake.
- Follow medical advice if you have kidney, heart, pregnancy, or fluid-restriction concerns.
More Calculators
Quick links to related tools and calculator categories.
Related
Same Category
Popular
Categories
FAQ
Common questions about this tool.
How much water should I drink a day?
This calculator gives a general estimate based on weight, activity, and climate. Individual needs vary.
Can I rely on this for medical conditions?
No. Follow professional advice if you have a medical condition or fluid restriction.