Free Water Deficit Calculator
Water needed to correct high serum sodium.
About Free Water Deficit Calculator
Water needed to correct high serum sodium. The Free Water Deficit Calculator on Picscaler gives you the answer instantly in your browser, with no sign-up.
Inputs: Weight (kg), Sodium (mmol/L) and Patient group.
Formula: Deficit (L) = TBW x (Na / 140 - 1); TBW = weight x 0.6 / 0.5 / 0.5 / 0.45 / 0.6. Correct slowly under medical supervision. This estimates the deficit only.
This tool is for education and information. It does not replace clinical judgement, so confirm results against your laboratory's reference ranges and local guidelines.
How to use Free Water Deficit Calculator
- Enter Weight (kg) and Sodium (mmol/L).
- Choose Patient group.
- Press Calculate.
- Read the result in the result table.
- Use the formula and notes under the result to check the working.
Frequently asked questions
Is Free Water Deficit Calculator free?
Yes. Free Water Deficit Calculator is completely free to use on Picscaler.
Do I need to create an account?
No. You can use it straight away without signing up.
Is my data safe?
Your input is processed in your browser on your own device and is not uploaded to Picscaler.
Can I use it for medical decisions?
No. It is an educational aid and does not replace professional medical judgement.
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