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Sodium Deficit Calculator

kg

Result

Calculated result 420 Based on the values entered.
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Sodium Deficit Calculator — free online calculator.

Formula

Sodium deficit = TBW × (target Na − current Na); TBW = factor × weight
  • Sodium Deficit Calculator calculates its result from Weight (kg), TBW factor, Target sodium, Current sodium. It uses the formula Sodium deficit = TBW × (target Na − current Na); 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, Target sodium, Current 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: Sodium Deficit

Inputs
  • Weight: 70 kg
  • TBW factor: 0.6
  • Target sodium: 140
  • Current sodium: 130

Using Weight (kg) = 70, TBW factor = 0.6, Target sodium = 140, Current sodium = 130, the calculated result is 420.

Sample result: Calculating…

Frequently asked questions

What does the Sodium Deficit calculate?

Sodium Deficit Calculator — free online calculator.

Which values should I enter?

Enter Weight, TBW factor, Target sodium, Current sodium using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Sodium deficit = TBW × (target Na − current Na); 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.

Page information

Updated: October 7, 2026