What this tool does
The calculator combines the weight and activity inputs using a simple heuristic. It does not assess your health, diet, total fluid intake or medical needs.
How to interpret the result
Do not use a generic formula to override an individual fluid plan from a clinician. If you have been given fluid restrictions or need advice about hydration, discuss the appropriate amount with your care professional.
Frequently asked questions
Is the result a precise daily requirement?
No. It is an illustrative formula result and cannot determine individual fluid needs.
Does it include food and all drinks?
The simplified estimate does not track your actual intake from food or drinks.