Hydration estimates
Daily fluid calculator
Explore a rough fluid estimate using body weight, activity and weather. Food, other drinks and health conditions also matter.
Estimated daily fluids
Common questions
Before you use this estimate
Does everyone need eight glasses?
No. Glass sizes and fluid needs vary. This is a rough planning tool, not a required minimum.
What if I have a fluid restriction?
Follow your prescribed limit. The calculator is not suitable for setting fluid intake in heart or kidney disease.