Water Intake Calculator
A commonly cited rule of thumb for daily water intake is about 33 ml per kilogram of body weight, more with intense exercise. Enter your weight for an indication.
Result
2.48 L/dag
Indicative water intake
How this was calculated
- 1Weight × guideline per kg75 kg × 33 ml = 2,475 ml
Formula
Water intake (L) = (weight × 33 or 40 ml) ÷ 1000
This rule of thumb scales water needs with body weight, on the assumption that a heavier body needs more fluid to function. During intense exercise or hot weather, needs increase, which this calculator approximates with a higher per-kilogram factor.
Worked examples
75 kg, normal activity
→ 2.48 litres per day.
Common mistakes
- Assuming fluid from food and other drinks doesn’t count; this figure is about total fluid intake, not pure water alone.
Important to know
- Certain medical conditions (such as kidney or heart problems) may require a different fluid intake; consult a doctor.
Limitations
- Individual needs vary by climate, health and pregnancy; this is a general guideline, not a medical prescription.
When to use it
- Setting a rough daily target for fluid intake.
Frequently asked questions
Does coffee and tea count towards my fluid intake?
Yes, despite caffeine’s mild diuretic effect, these drinks still contribute net to your fluid balance.
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