Nephrology · Internal Medicine
Free-Water Deficit calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Choose an estimated total-body-water fraction appropriate to body composition. This static estimate excludes ongoing losses and does not prescribe a correction rate.
Result
Complete all required inputs to calculate the score.
Formula inputs
- Body weight (kg)Accepted range: 0.1 to 500
- Estimated total-body-water coefficient
- Measured serum sodium (mmol/L)Accepted range: 50 to 250
Primary source
Adrogué HJ, Madias NE. Hypernatremia. N Engl J Med. DOI: 10.1056/NEJM200005183422006. PMID: 10816188. Scope: static estimate of electrolyte-free water deficit; ongoing losses and clinical correction-rate limits require separate assessment. (2000)
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