Water Intake Calculator — How Much Water Should You Drink Per Day? | Calczia

"Drink 8 glasses of water a day." You've heard it a thousand times. But is 8 glasses actually right for you? The truth is, your ideal daily water intake depends on your body weight, activity level, and climate — and for most Indians living in a hot and humid country, the generic advice often falls short.

Calczia's Water Intake Calculator gives you a personalised hydration target based on your specific inputs — not a one-size-fits-all rule.

How Much Water Should You Drink Per Day?

The most widely used scientific guideline is 35 ml of water per kg of body weight per day for a sedentary adult. So:

• 60 kg person: 60 × 35 = 2,100 ml = 2.1 litres per day
• 75 kg person: 75 × 35 = 2,625 ml = approximately 2.6 litres per day
• 90 kg person: 90 × 35 = 3,150 ml = 3.15 litres per day

If you exercise, live in a hot climate (which most Indians do for 6+ months a year), or are pregnant or breastfeeding, your requirement goes up significantly — typically by 500 ml to 1 litre more.

Signs You Are Not Drinking Enough Water

• Dark yellow urine (pale yellow = well hydrated)
• Fatigue or difficulty concentrating
• Headaches, especially in the afternoon
• Dry mouth, lips, or skin
• Feeling hungry when you're actually thirsty

In India's summer months (March–June), dehydration is a genuine health risk. Our calculator adjusts for activity level so you can stay properly hydrated even during workouts or outdoor work.

Water from Food — Does It Count?

Yes. About 20% of daily water intake typically comes from food — fruits, vegetables, dal, rice, and other water-rich foods. Our calculator accounts for this when giving your drinking water target.