How Much Water Should You Drink Per Day?
Your ideal daily water intake depends on your body weight, how much you exercise, and the climate you live in. This calculator uses a baseline of roughly 33ml of water per kilogram of body weight, then adds extra for exercise and hot or humid conditions - giving you a personalized target rather than a generic "8 glasses a day" rule.
Why Personalized Hydration Matters
A larger, more active person in a hot climate needs meaningfully more water than someone smaller and sedentary in a mild climate. Even mild dehydration (as little as 1-2% of body weight) can reduce energy, concentration, and workout performance, which is why matching your intake to your actual body and lifestyle matters. Staying properly hydrated also supports the weight loss diet plan you may already be following, since water helps control appetite.
Tips to Hit Your Daily Target
- Drink a full glass of water first thing in the morning.
- Keep a water bottle visible on your desk as a reminder.
- Add a glass before each meal - it also supports portion control.
- Increase intake further on hot days or longer workouts.
Frequently Asked Questions
Do coffee and tea count toward my water intake?
Yes, in moderation. Despite the myth, caffeinated drinks still contribute net fluid to your daily total, though water remains the best primary source.
Can I drink too much water?
It's rare, but overhydration (hyponatremia) can happen with extreme intakes far beyond typical daily recommendations consumed in a short window.
Does drinking more water help with weight loss?
Water itself has no calories, but staying hydrated supports metabolism and can reduce overeating by increasing fullness before meals.