HEALTH TOOL
Water Intake Calculator
Estimate a daily water intake target based on body weight and activity.
Suggested daily water intake
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In cups (250ml)
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About this tool
Gives a general daily water intake estimate based on body weight, adjusted upward for activity level. It's a widely used rule-of-thumb starting point, not a precise medical requirement — actual needs vary with climate, health conditions, and individual factors, and food also contributes meaningfully to daily fluid intake.
Frequently asked questions
- What formula is used?
- A common baseline of about 33ml per kilogram of body weight, with an additional allowance added for moderate or high activity levels to account for fluid lost through exercise.
- Does this count water from food and other drinks?
- No — this is an estimate of total fluid intake from all sources combined; food and other beverages count toward the total too, not just plain water.
- Should I follow this exactly?
- Treat it as a general guide. Climate, health conditions, pregnancy, and medications can all change how much fluid someone needs — check with a healthcare provider for anything more specific.