AIAZHHow To Use
- Enter your weight in kilograms.
- Enter your average daily exercise duration in minutes.
- Select your climate (normal or hot/humid).
- Click "Calculate Water Intake" to see your recommended daily water intake.
- Use the results to set daily hydration goals and track your water consumption.
Frequently Asked Questions
How much water should I drink per day?
A common guideline is 30-35 ml per kg of body weight. For a 70 kg person in a normal climate with light activity, that is about 2.1-2.5 liters per day. This calculator personalizes the recommendation based on your specific factors.
Does exercise increase my water needs?
Yes. For every 30 minutes of exercise, add about 350-500 ml (12-17 oz) of water to compensate for fluid loss through sweat. The calculator accounts for your daily exercise duration.
Does climate affect hydration needs?
Yes. Hot and humid climates increase sweat rate and fluid loss. The calculator adds approximately 500-750 ml per day for hot climate conditions.
What are the signs of dehydration?
Common signs include dark urine, thirst, dry mouth, headache, fatigue, dizziness, and reduced urine output. If your urine is pale yellow, you are likely well hydrated.
Is my health data stored or shared?
No. All calculations are performed locally in your browser. Your weight and activity data never leaves your device.
Can I drink too much water?
Yes, though rare. Drinking excessive water in a short period can lead to hyponatremia (low sodium levels). Stick to your recommended intake and listen to your body's thirst signals. Consult a doctor if you have kidney or heart conditions.
Personalized Hydration Goals
Get a daily water intake recommendation based on your body weight, exercise duration, and climate. No more guessing how much to drink.
Multiple Unit Display
See your daily water target in liters, milliliters, cups, water bottles, and fluid ounces. Choose the unit that works best for your tracking method.
100% Private & Secure
Your health data never leaves your device. All calculations happen locally in your browser with JavaScript.
Free & No Signup
No account required, no email needed. Use the water intake calculator unlimited times for free.
Calculate Your Daily Water Intake for Optimal Hydration
Our free water intake calculator gives you a personalized daily hydration goal based on your weight, exercise habits, and climate. Proper hydration supports energy levels, brain function, digestion, and overall health.
Why Proper Hydration Is Essential for Health
Water makes up about 60% of your body weight and is essential for every bodily function. It regulates temperature, lubricates joints, transports nutrients, and removes waste. Even mild dehydration can impair cognitive function, physical performance, and mood.
Tips for Staying Hydrated Throughout the Day
Start your day with a glass of water, carry a reusable water bottle, set hourly reminders, eat water-rich foods (cucumbers, watermelon, oranges), and drink before, during, and after exercise. Flavor water with lemon or cucumber if plain water is unappealing.
Hydration for Athletes and Active People
If you exercise regularly or have a physically demanding job, your water needs increase significantly. Drink 350-500 ml of water 2-3 hours before exercise, 150-300 ml every 15-20 minutes during exercise, and 450-650 ml for every 0.5 kg of weight lost after exercise.