Free Water Deficit Calculator
Result
Free Water Deficit Calculator — free online calculator.
Formula
- Free Water Deficit Calculator calculates its result from Weight (kg), TBW factor, Current sodium, Target sodium. It uses the formula Deficit = TBW × (current Na ÷ target Na − 1); TBW = factor × weight. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Weight, TBW factor, Current sodium, Target sodium. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Free Water Deficit
- Weight: 70 kg
- TBW factor: 0.6
- Current sodium: 150
- Target sodium: 140
Using Weight (kg) = 70, TBW factor = 0.6, Current sodium = 150, Target sodium = 140, the calculated result is 3.
Sample result: Calculating…
Frequently asked questions
What does the Free Water Deficit calculate?
Free Water Deficit Calculator — free online calculator.
Which values should I enter?
Enter Weight, TBW factor, Current sodium, Target sodium using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Deficit = TBW × (current Na ÷ target Na − 1); TBW = factor × weight.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.