Wondering how much water you should drink every day? This free water intake calculator estimates your personal daily target from your body weight, activity level, and climate — in seconds.
How the calculation works
We start with your body weight in kilograms and multiply it by 35 milliliters — a widely used hydration baseline. If you enter pounds, we convert first (1 lb = 0.453592 kg). Then we adjust for your lifestyle:
- Moderate activity: +350 ml
- Active lifestyle: +700 ml
- Hot climate: +500 ml
Your result shows the total in liters and the equivalent number of 8-ounce glasses, plus a full breakdown of the math so you can see exactly where the number comes from.
Simple tips to hit your daily target
- Start your morning with a full glass of water.
- Keep a reusable bottle at your desk or in your bag.
- Drink a glass of water with every meal.
- Drink more on workout days and in hot weather.
- Eat water-rich foods like cucumber, oranges, and watermelon.
For information only — not medical advice. If you have a health condition or take medication, ask your doctor how much water is right for you.