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💧 Your Details
Personalized hydration based on your body and lifestyle
30 kg300 kg
💧 Your Daily Water Intake
Daily Water Intake
2.8
litres / day
personalized for your body and lifestyle
💧 Glasses Per Day (250ml each)
Glasses
11
Millilitres
2,800
Fl. Oz
94.7
⏰ Your Personalized Daily Drinking Schedule
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How Much Water Should You Drink Per Day?
Water intake needs vary significantly from person to person based on body weight, physical activity, climate and health status. A simple one-size-fits-all recommendation misses these important individual factors. Our calculator uses the most widely validated formula adjusted for your specific lifestyle.
Base Water Intake = Body Weight (kg) × 35 ml
Activity Adjustment:
Sedentary: +0 ml
Lightly Active: +350 ml
Moderately Active: +550 ml
Very Active: +750 ml
Extra Active: +1,000 ml
Climate Adjustment:
Cool: +0 ml
Moderate: +200 ml
Hot: +400 ml
Very Hot: +600 ml
Example — 70 kg, moderately active, moderate climate:
Base: 70 × 35 = 2,450 ml
Activity: +550 ml
Climate: +200 ml
Total: 3,200 ml (about 13 glasses)
Why Water Is Critical For Your Health
Water makes up approximately 60 percent of your body weight and is essential for virtually every bodily function. It regulates body temperature, transports nutrients, flushes waste products, lubricates joints and supports organ function. Even mild dehydration of 1-2 percent of body weight impairs cognitive performance, physical endurance and mood significantly.
Best Times To Drink Water
- Morning — drink 500 ml immediately after waking — your body is dehydrated after 7-8 hours without water
- Before meals — drink 250 ml 30 minutes before eating — reduces appetite and supports digestion
- Before and during exercise — prevent performance drops from dehydration
- Afternoon slump — drink instead of coffee — afternoon fatigue is often dehydration not tiredness
- Evening — stop 1-2 hours before bed — prevents sleep disruption from night bathroom trips
How To Know If You Are Well Hydrated
The simplest and most reliable indicator is urine color. Pale yellow or straw colored urine means you are well hydrated. Clear urine may indicate overhydration. Dark yellow or amber urine means drink water immediately. Orange or brown urine can indicate severe dehydration or a health issue requiring medical attention.
⚠️ Health Disclaimer: This water intake calculator provides general guidance for informational purposes only. Individual hydration needs vary based on health conditions, medications and other factors. People with kidney disease, heart conditions or other health issues may have specific fluid restrictions. Always follow your healthcare provider's recommendations regarding fluid intake.
Frequently Asked Questions
How much water should I drink per day? +
The general recommendation is 35 ml of water per kilogram of body weight per day as a base. For a 70 kg person that is 2,450 ml or about 8-10 glasses. Add more for exercise — approximately 500-750 ml per hour of activity — and for hot weather. Use our calculator above for a personalized recommendation based on your specific weight, activity level and climate.
Is the 8 glasses of water per day rule accurate? +
The 8 glasses rule is a useful starting point but not scientifically precise for everyone. A 50 kg sedentary person in a cool climate needs far less than an 90 kg athlete in hot weather. The rule originated from a 1945 recommendation that was misinterpreted. Modern research supports personalized intake based on body weight, activity and environment rather than a fixed number for everyone.
How does exercise affect how much water I need? +
Exercise significantly increases water needs. You lose approximately 0.5-1 litre per hour of moderate exercise through sweat and breathing. In hot conditions this can reach 1-2 litres per hour. Drink 500 ml of water 2 hours before exercise, 250 ml every 15-20 minutes during exercise and 500 ml for every 0.5 kg of body weight lost during the session to ensure full rehydration.
What are signs of dehydration? +
Early dehydration signs include dark yellow urine, thirst, dry mouth, headache and mild fatigue. Moderate dehydration causes dizziness, reduced concentration and decreased physical performance — even 2 percent dehydration reduces exercise performance by up to 20 percent. The simplest check is urine color — pale yellow means well hydrated, dark yellow means drink water immediately.
Does coffee and tea count toward daily water intake? +
Yes — contrary to popular belief moderate coffee and tea consumption does count toward your daily fluid intake. Research shows the mild diuretic effect of caffeine is outweighed by the fluid content of the drink for most people consuming up to 4 cups per day. However plain water remains the best hydration source. Alcohol does not count — it actively dehydrates and requires extra water to compensate.
How much water should I drink to lose weight? +
Drinking adequate water supports weight loss in multiple ways. Drinking 500 ml before meals reduces calorie intake by creating a feeling of fullness. Studies show 2 litres of water daily increases metabolism by approximately 96 calories per day. Staying well hydrated reduces false hunger signals — thirst is frequently misidentified as hunger leading to unnecessary snacking. Staying hydrated also supports optimal exercise performance which burns more calories.
Can you drink too much water? +
Yes but it is rare under normal circumstances. Overhydration or hyponatremia occurs when excessive plain water dilutes blood sodium to dangerous levels. This mainly occurs during extreme endurance events when athletes drink far more than they sweat. For most healthy people following our calculator recommendations there is no risk of overhydration. Listen to your body and do not force excessive intake beyond what our calculator recommends.