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Daily Water Intake Calculator

Calculate your Daily Water Intake easily. Find out how much water you should drink per day based on weight, age, activity, and climate.

Water is life. Staying hydrated helps your body stay alert, boosts your mood, and keeps your organs healthy. But how much water should you drink each day? Our Daily Water Intake Calculator makes it simple to find out.

Whether you’re wondering “How much water should I drink daily based on weight?” or trying to figure out if 64 ounces a day is enough, this calculator gives you a personalized answer in seconds.

How the Daily Water Intake Calculator Works

Our calculator uses a simple formula based on weight, age, activity level, and climate. It adjusts your daily water needs to give you a realistic target.

Step 1: Base Water Intake

The first step is to calculate your base water requirement. The formula is:

Base Water Intake (liters) = Weight (kg) × 0.033

For example, if you weigh 70 kg, your base intake is:

70 × 0.033 = 2.31 liters per day

Step 2: Age Adjustment

As we get older, our bodies may need slightly less water. The calculator adjusts your intake like this:

  • Ages 31–55: Base intake × 0.95
  • Ages 56 and above: Base intake × 0.90

If you’re 40 years old and weigh 70 kg:

2.31 × 0.95 = 2.1945 liters per day

Step 3: Activity and Climate Adjustment

Your activity level and local climate influence how much water you need. The calculator multiplies your adjusted intake by an activity factor and adds a climate adjustment:

Final Water Intake = Base Intake × Activity Level + Climate Adjustment

Activity Levels:

  • Sedentary: 1.2
  • Lightly active: 1.375
  • Moderately active: 1.55
  • Very active: 1.725
  • Super active: 1.9

Climate Adjustments:

  • Mild: 0 liters
  • Hot/Arid: 0.5 liters
  • Very Hot: 1 liter

For example, a moderately active 40-year-old weighing 70 kg in a hot climate:

2.1945 × 1.55 + 0.5 = 3.90 liters per day

How to Use the Calculator

  1. Enter your weight in kilograms.
  2. Add your age in years.
  3. Select your activity level.
  4. Choose your climate.
  5. Click Calculate to see your recommended daily water intake.

You’ll get a precise value in liters per day. It’s that easy.

Final Verdict

Drinking the right amount of water isn’t just about staying hydrated. It helps your skin, aids digestion, and keeps your energy up. Using a Daily Water Intake Calculator ensures you meet your body’s needs without overthinking it.

FAQs

Can I rely on this calculator if I exercise heavily?

Yes. It adjusts water intake based on activity level. For intense workouts, consider extra hydration during exercise.

Does climate affect water needs?

Absolutely. Hot or dry climates increase water loss, so the calculator adds extra liters for safety.

Is 64 oz of water enough per day?

It depends on your weight, age, and activity. For some, it’s enough; for others, you may need more. Use the calculator for personalized guidance.

How do I measure water in liters if I use cups or ounces?

1 liter ≈ 33.8 fl oz. Simply convert your recommended intake if needed.