Heuristic daily water estimate
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
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Calculation
Result
- Total water
- 2500 ml/day
- Of that, from drinks
- 1880 ml/day
- Equivalent
- 8 glasses
- Volume in ounces
- 85 fl oz/day
- Baseline requirement
- 2250 ml/day
- Activity adjustment
- 250 ml/day
- Climate adjustment
- 0 ml/day
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Equivalent in US fluid ounces (fl oz)
These are model assumptions, not EFSA requirements. EFSA total water from drinks and food is 2.0 L for women and 2.5 L for men, the same for adults and older adults under moderate conditions. Actual sweat losses and disease-related limits need separate assessment.
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How it is calculated
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Formula
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Limits of the method
These are model assumptions, not EFSA requirements. EFSA total water from drinks and food is 2.0 L for women and 2.5 L for men, the same for adults and older adults under moderate conditions. Actual sweat losses and disease-related limits need separate assessment.
Sources of the method
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
How to use the calculation
Enter the starting values
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Adjust the parameters
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
Read the result
These are model assumptions, not EFSA requirements. EFSA total water from drinks and food is 2.0 L for women and 2.5 L for men, the same for adults and older adults under moderate conditions. Actual sweat losses and disease-related limits need separate assessment.
Frequently asked questions
What does the calculation show?
Selected model: 30 mL/kg + 500 mL per hour of activity + 500 mL in heat. An assumed 75% comes from drinks; a glass is 250 mL. No age-related reduction is applied.
What limitations apply?
These are model assumptions, not EFSA requirements. EFSA total water from drinks and food is 2.0 L for women and 2.5 L for men, the same for adults and older adults under moderate conditions. Actual sweat losses and disease-related limits need separate assessment.
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What next
Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.
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