Sodium Salt Equivalent CalculatorFree online fitness & health calculator — instant results, no sign-up
Convert sodium mass to the corresponding sodium chloride mass.
For general information only. This is not medical advice, diagnosis, dosing guidance or a treatment recommendation. Talk to a doctor or other qualified health professional about your health, pregnancy, or diet.
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About the Sodium Salt Equivalent Calculator
The Sodium Salt Equivalent Calculator converts a sodium mass in milligrams into the mass of sodium chloride containing the same amount of sodium. It uses the chemical mass ratio of sodium chloride to sodium, rather than estimating how much table salt is actually present in a food. With the default input of 800 mg sodium, the sodium chloride equivalent is 2.03 g.
- Sodium (mg)
- The mass of sodium to convert, entered in milligrams, with a default value of 800 mg.
Formula and method
m_NaCl = (m_Na / 1000) × (M_NaCl / M_Na) = (m_Na / 1000) × (58.44 / 22.99)
- m_NaClSodium chloride equivalent mass in grams.
- m_NaEntered sodium mass in milligrams.
- M_NaClMolar mass of sodium chloride, approximately 58.44 g/mol.
- M_NaMolar mass of sodium, approximately 22.99 g/mol.
Divide the sodium input by 1000 to convert milligrams to grams, then multiply by the sodium chloride-to-sodium molar mass ratio, approximately 2.542. Each formula unit of sodium chloride contains one sodium atom, so this ratio gives the mass of sodium chloride containing the entered sodium mass. For 800 mg, (800 / 1000) × (58.44 / 22.99) gives 2.03 g when rounded to two decimal places.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Sodium800 mg
Results
- Sodium chloride equivalent2.03 g
- NoteChemical mass equivalent; food sodium may come from compounds other than salt.
How to use the Sodium Salt Equivalent Calculator
- 1Find the sodium mass on a nutrition label or in another reliable source, making sure it is expressed in milligrams.
- 2Enter that amount in Sodium (mg), or leave the default value of 800.
- 3Read the sodium chloride equivalent in grams; the default input produces 2.03 g.
- 4Read the accompanying note before treating the result as an estimate of salt in food.
- 5Keep the result on the same serving or intake basis as your input, such as per serving or per day.
Reading your result
The “Sodium chloride equivalent” row reports the mass of pure sodium chloride that would contain the entered sodium mass: 2.03 g for 800 mg sodium. The “Note” row states: “Chemical mass equivalent; food sodium may come from compounds other than salt.” This means the result is an equivalent mass, not a measurement of sodium chloride actually present.
Limitations
The calculation assumes pure sodium chloride as the reference compound and uses approximate molar masses. Food sodium can also come from compounds such as sodium bicarbonate or monosodium glutamate, so total sodium alone cannot reveal actual sodium chloride content. Input rounding and the two-decimal output limit precision. Enter a nonnegative sodium mass, not a salt mass; this tool does not assess dietary suitability or recommend a sodium intake.
Common questions
Why does 800 mg of sodium correspond to 2.03 g of sodium chloride?+
Sodium chloride includes both sodium and chlorine. Its molar mass is about 2.542 times the molar mass of sodium, so converting 800 mg to grams and multiplying by that ratio gives 2.03 g after rounding.
Does this result tell me how much table salt is in a food?+
No. It tells you how much pure sodium chloride would contain the same sodium mass. If some sodium comes from other compounds, the food's actual sodium chloride content cannot be determined from this conversion alone.
Why might a nutrition guide use a factor of 2.5 instead?+
A factor of 2.5 is a simplified sodium-to-salt conversion. This calculator uses the chemical molar mass ratio, approximately 2.542, so its result can differ slightly from that shortcut.
Should I enter the salt amount or the sodium amount from a label?+
Enter the sodium amount in milligrams. A value already labeled as salt is not the correct input because this calculator converts sodium into a sodium chloride equivalent.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
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Results are estimates for informational purposes and are not financial, medical or legal advice.