Water Intake Calculator
Estimate your daily water intake target, adjusted for Thailand's climate.
General guidance, not medical advice
This is a general hydration estimate based on body weight, activity, and climate — not personalized medical advice. Individual needs vary with health conditions, medications, and other factors a general formula can’t account for. Talk to a doctor for guidance specific to you, especially if you have a kidney, heart, or other condition that affects fluid intake.
Daily water intake target
3 L
2,995 ml
How this is calculated
Base intake is 33ml per kilogram of body weight. Exercise adds roughly 350ml per 30 minutes of activity. The hot-climate adjustment adds a flat allowance on top when enabled.
Related guides & tools
- Asian BMI Calculator (WHO Asia-Pacific cut-offs) — check your weight range on the cut-offs used clinically in Thailand
Frequently asked questions
Why does Thailand's climate change how much water I need?
Higher heat and humidity increase sweat losses substantially, so general hydration guidelines developed for temperate climates tend to understate needs for daily life in Thailand. The hot-climate adjustment adds an allowance for this.
Does coffee or tea count toward this target?
This calculator estimates total fluid needs generally, without distinguishing drink type. Caffeinated drinks have a mild diuretic effect, so plain water is still the most reliable way to hit a hydration target.