📘 Complete Hydration Guide: How Much Water Should You Drink?
Water is essential for every cell in your body. But the old “8 glasses a day” rule isn’t personalised. This guide explains how to calculate your ideal intake and offers tips to stay hydrated.
Why Hydration Matters
Proper hydration improves brain function, energy levels, digestion, skin health, and even weight management. Even mild dehydration (1-2% body weight loss) can impair concentration and physical performance.
Factors That Affect Your Water Needs
- Weight – Larger bodies need more water.
- Activity level – Sweating increases fluid loss.
- Climate – Hot/humid weather raises requirements.
- Exercise duration – Add ~12 ml per minute of exercise.
- Age & health – Older adults and certain conditions may need adjustments.
Sample Water Intake Chart (by weight and activity)
| Weight (kg) | Sedentary (L/day) | Active (L/day) | Athlete (L/day) |
|---|---|---|---|
| 50 kg | 1.8 L | 2.2 L | 2.8 L |
| 70 kg | 2.5 L | 3.0 L | 3.8 L |
| 90 kg | 3.2 L | 3.8 L | 4.8 L |
Tips to Increase Water Intake
- Carry a reusable water bottle with time markers.
- Drink a glass of water before each meal.
- Eat water-rich foods (cucumber, watermelon, oranges).
- Set hourly reminders on your phone or smartwatch.
- Flavour water with lemon, mint, or berries.
Can You Drink Too Much Water?
Yes – overhydration (hyponatremia) is rare but possible. Listen to your body and don’t force excessive amounts. Our calculator provides safe, evidence‑based ranges.
Use our daily water intake calculator to get your exact number.