Daily Water Intake Calculator
Discover how much water your body needs each day based on your age, weight, activity level, and season. Choose between Metric (kg) or US (lbs) units.
Recommended Daily Water Intake
Liters: L/day
Glasses (250ml): glasses/day
Other Calculators in This Category
How Much Water Should You Drink Per Day?
Staying hydrated is essential for maintaining energy, digestion, temperature regulation, and overall health. Our Daily Water Intake Calculator helps you estimate how much water your body needs each day based on your weight, age, activity level, and season. Whether you're in the heat of summer or relaxing in winter, hydration needs vary — and we’ve got you covered.
Why Use a Water Intake Calculator?
Everyone’s water needs are different. Factors like body weight, age, exercise level, and climate all influence how much you should drink. This tool gives a personalized result so you're not just guessing. It's perfect for:
- People trying to stay healthy and hydrated
- Fitness enthusiasts needing to rehydrate after workouts
- Those living in hot or humid climates
- Parents, seniors, or anyone tracking hydration goals
How This Calculator Works
Our formula is based on the standard recommendation of 0.033 liters of water per kilogram of body weight. We then apply multipliers based on:
- Activity Level: More movement = more water loss through sweat
- Season: Summer heat requires extra hydration vs. cooler weather
- Age: Children and older adults may need slight adjustments in fluid needs
- US Units: You can also enter weight in pounds (lbs) — the calculator converts it automatically
The result is shown in liters per day and in an easy-to-follow number of glasses (250 ml). This makes your hydration goal more visual and practical.
Benefits of Staying Properly Hydrated
- Improves brain function and energy levels
- Helps with digestion and metabolism
- Reduces risk of kidney stones and urinary infections
- Keeps your skin, joints, and muscles healthy
- Regulates body temperature and flushes out toxins
How Much Water Do You Need in Summer vs. Winter?
In hot weather, you sweat more — even without exercise. That’s why we apply a multiplier in summer to increase your daily water target by up to 15%. During winter or rainy seasons, the requirement is slightly lower.
Water Intake Recommendations by Weight
| Weight | Recommended Water |
|---|---|
| 50 kg (110 lbs) | 1.65 L/day |
| 60 kg (132 lbs) | 2.0 L/day |
| 70 kg (154 lbs) | 2.3 L/day |
| 80 kg (176 lbs) | 2.65 L/day |
| 90 kg (198 lbs) | 3.0 L/day |
Frequently Asked Questions (FAQ)
1. How much water should I drink per kg of body weight?
The general recommendation is 0.033 liters per kg. That means a 60 kg person needs around 2 liters daily.
2. What if I live in a hot climate or work outdoors?
Increase your intake by 10–20%. The calculator does this for you if you choose “Summer” or high activity levels.
3. Can I use lbs instead of kg?
Yes! Select "US (lbs)" as your unit system and enter your weight in pounds. The tool converts it automatically.
4. Do kids or seniors need different amounts?
Yes. Children generally need less. Older adults may need adjustments based on kidney function or medications. Our calculator factors in age to help estimate properly.
5. How many glasses of water should I drink daily?
The result shows your recommended number of 250 ml glasses per day. For most people, this ranges from 8–12 glasses.
Stay Hydrated, Stay Healthy
Water is life. Use this free daily water intake calculator to stay on top of your hydration needs. Whether you're trying to lose weight, boost energy, or simply take care of your health, drinking the right amount of water each day is the easiest habit to build.