Fluid Deficit (Estimation)
Estimated fluid deficit from weight and % dehydration. Estimation only.
What this calculator does
This tool estimates fluid deficit (in mL) from body weight and an assumed percentage of dehydration. It is a rough reference used in some clinical settings, not a prescription for how much to drink or give.
What your result means
The result is an estimate only. Fluid replacement must be decided by a healthcare provider based on your condition, labs, and clinical assessment. Do not use this to self-treat dehydration.
This is not medical advice. A healthcare provider should interpret results in your context.
Weight (kg)
Dehydration (%)
Key terms
- Fluid deficit
- Estimated volume of fluid loss (e.g. from dehydration), often in mL.
- Dehydration
- Loss of body water; percentage is sometimes estimated clinically (e.g. 5%, 10%).
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This tool is for educational and reference use only. It does not constitute medical advice. Always consult a healthcare professional for medical decisions.