During the summer of 2026, the body loses more water than usual due to sweat and heat, making adequate hydration essential. But the question is, “ how many glasses should you drink daily to be just right?” Thairath Online will guide you through a simple way to calculate your daily water intake along with proper recommendations.
Many are familiar with the advice to “drink 8 glasses a day,” or about 2 liters, but the truth is the ideal water amount varies for each person, depending on body weight, energy use, and weather conditions.
Each person’s daily water needs differ. A precise method is “ to calculate based on body weight ” which helps determine the amount best suited to oneself. The formula for water intake is as follows:
Body weight (kg) × 2.2 × 30 ÷ 2 = recommended daily water intake (ml)
Note: This amount can be adjusted upward if the weather is very hot or if you spend time outdoors sweating a lot.
During hot weather or outdoor activities, increase water intake since the body loses fluids through sweat. For example, if doing heavy exercise or working outside, drink an additional 0.5-1 liter. You can also watch for signs such as dizziness, fatigue, headaches, dry skin, and dry mouth if you drink too little.
Many think the more water you drink, the better. However, “drinking excessively” may risk water intoxication, lowering blood sodium levels and affecting brain and bodily functions, known as water intoxication (Water Intoxication), which can cause the following symptoms:
Nevertheless, there is no fixed answer to how many glasses of water to drink daily. The best method is “ to calculate according to your body weight ” and adjust based on daily activities, especially during summer when the body loses more water. Proper hydration helps keep you refreshed, improves skin health, and reduces long-term health risks.
Source: Sikarin Hospital