Water Intake
A rough daily fluid estimate from body size.
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A common rule of thumb scales fluid with body weight and adds a bit for exercise. Kidneys, heat, and illness change need. This is an estimate.
How to use this tool
- Enter your measurements. Use the units shown on the labels. Do not send medical data anywhere.
- Read the estimate. These formulas are public rules of thumb, not a diagnosis.
- Talk to a clinician for decisions. Do not change medicine, diet, or training from this page alone.
Not a prescription
Over-drinking can be harmful. Some conditions require fluid limits. Ask a clinician if you have kidney, heart, or endocrine disease.
Frequently asked
Does coffee count?
Many people count most fluids. This page reports a water-equivalent estimate only.
Should I drink this during pregnancy?
Needs change. Use obstetric guidance, not this estimate.
Is 8 glasses required?
No. That slogan is not individualized.
Should I force this volume if I have kidney disease?
No. Fluid limits need a clinician. This target is only an estimate.
Can I switch liters and ounces?
Yes.