Finelib Calculators
Estimate a daily beverage fluid planning target for adults using body weight, exercise time and hot-weather conditions.
Click Calculate Daily Water Intake above.
Base planning estimate: body weight in kilograms multiplied by 35 mL. Exercise allowance: 350 mL per 30 minutes of activity. Hot-weather allowance: 500 mL for hot weather or 1,000 mL for very hot weather with sweating. These are simplified assumptions, not validated individual requirements. Food also contributes water to total intake.
Fluid needs vary with body size, activity, weather, diet and health. This calculator provides an illustrative planning estimate.
The result is a suggested beverage planning amount, not a measurement of total water from food and drinks.
Sweating during exercise can increase fluid losses. Actual needs depend on exercise intensity, duration and individual sweat rate.
Heat may increase sweating and fluid requirements. The extra allowance here is an illustrative estimate.
Yes. Drinking excessive amounts quickly can cause dangerous low blood sodium. Avoid forcing large volumes.
People who have been advised to limit fluids should follow their clinician’s instructions rather than this estimate.
Pregnancy and breastfeeding change fluid requirements. Seek individualized advice instead of relying on this adult planning estimate.
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