Calculate how much water you should drink daily based on your weight, activity level, and climate.
| Total Water | |
| In Liters | |
| In Cups (250ml) | |
| In Glasses (8oz) |
This calculator estimates how much water you should drink per day based on your body weight, activity level, and climate — since a fixed "8 glasses a day" rule doesn't account for individual differences in size, exercise, or heat.
Example: a 70kg person with moderate activity in a warm climate needs noticeably more daily water than the same person in a cool climate at rest — adjust the inputs above to match your situation.
This calculator uses a common general guideline of about 33ml per kilogram of body weight as a baseline, then adds extra for physical activity and hot/humid climates. Individual needs can vary based on health conditions, diet, and other factors.
This calculator uses a common general guideline of about 33ml per kilogram of body weight as a baseline, then adds extra for physical activity and hot or humid climates.
It calculates your recommended daily water intake based on your weight, activity level, and climate.
Yes, the calculator adds extra water intake for hot and humid climates on top of the baseline guideline.
Yes — the calculator adds roughly 350-700ml of extra water per 30 minutes of exercise (depending on intensity) on top of your baseline daily intake, since sweat loss during activity increases your fluid needs.
No, individual needs can vary based on health conditions, diet, and other factors, so this should be treated as a general guideline.