Calculator
Water Intake Calculator
A rough daily fluid range from body weight. Heat, training, and thirst should override any calculator.
Last updated August 2026
Rough daily fluid starting point
2100–2450 ml
About 8.8+ cups from the low end, before extra heat or long training. Thirst, urine colour, climate, and sweat all matter more than a single formula.
These tools provide estimates for educational purposes only. They are not medical advice, diagnosis, or a personalised nutrition or training prescription. Individual needs vary. If you have a medical condition, are pregnant, or take medication, speak with a qualified professional before making changes.
NKFitness content is for educational purposes only. It is not medical advice, diagnosis, or a substitute for care from a qualified professional. Training and nutrition needs vary. If you have an injury, medical condition, or eating-related concern, get personalised guidance before making major changes.
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