Sodium vs salt on food labels: convert the amount and unit correctly

Read both the nutrient name and the unit

A label showing salt in grams and a diary showing sodium in milligrams can appear to disagree even when they describe the same food. There are two differences to resolve: which quantity is being reported and which unit is used. Fixing only one difference leaves the comparison incomplete.

Write the value with its full description before converting, for example salt equivalent, grams per 100 g. Then identify the receiving field, such as sodium, milligrams per serving. A short number copied without those labels is easy to misinterpret, especially when moving between packages or tools from different markets.

Convert salt equivalent and sodium on the same unit basis

Leeds Teaching Hospitals NHS Trust gives the sodium-to-salt conversion as multiplication by 2.5, and salt-to-sodium as division by 2.5. Keep the units the same while using that factor. Separately, 1 g equals 1,000 mg. The two operations solve different parts of the mismatch.

Hypothetical example: 400 mg sodium multiplied by 2.5 gives 1,000 mg salt equivalent, or 1 g. In the other direction, 1.5 g salt equivalent divided by 2.5 gives 0.6 g sodium, or 600 mg. Do not multiply by 1,000 a second time after the value is already in milligrams.

Sources: [3]

Apply the serving multiplier without changing the conversion meaning

Suppose a hypothetical product lists 1.2 g salt per 100 g, and you consume 75 g. The consumed salt equivalent is 1.2 multiplied by 0.75, or 0.9 g. Dividing 0.9 g by 2.5 gives 0.36 g sodium, equivalent to 360 mg.

You can convert the source amount first and scale afterwards, provided every step stays on the same basis. Here, 1.2 g divided by 2.5 is 0.48 g sodium per 100 g, and 75 percent of that is still 0.36 g. The arithmetic should agree. A mismatch suggests a unit or portion was applied differently.

Sources: [1]

Do not count sodium and salt equivalent as separate meal additions

Salt equivalent and sodium can be two reporting forms related by the conversion. They are not independent foods to add together. A field recording sodium should contain the appropriately converted sodium amount, while a salt-equivalent comparison should retain that basis explicitly.

Likewise, the product label already describes its stated nutrition basis. Adding another full salt value merely because salt appears in the ingredient list can duplicate what is included. Salt you separately add during preparation is a different recipe input, but its amount and allocation still need to be known or estimated.

Keep quantity conversion separate from recipe uncertainty

A conversion can be mathematically correct without measuring an unknown sauce or restaurant meal. If you do not know the amount or the source recipe, converting an estimated sodium value into salt equivalent does not make the meal exact. Preserve the uncertainty of the original record.

The NCI distinguishes estimated from measured portions. For a known packaged ingredient, a measured amount and matching label make the calculation easier to audit. For a shared recipe, check whether the ingredient total has been allocated to your serving. A photo cannot determine every seasoning amount hidden in the dish.

1. Identify whether the source reports sodium or salt equivalent.
2. Write its unit and reference serving.
3. Convert with the 2.5 factor on one mass-unit basis.
4. Convert grams and milligrams only as needed.
5. Scale to the consumed amount and check the receiving field.

Sources: [2]

Keep CalQuest and any additional nutrient record on a clear basis

CalQuest supports manual known calories and macros as well as editable photo estimates. Check the name and unit of any nutrient field available in the current interface before transferring additional label information. This guide does not promise a dedicated salt-equivalent calculator or a clinical sodium-management feature.

For a meal photo, add known preparation context and review the recognised food and amount. CalQuest does not scan nutrition labels, barcodes or measure seasoning from an image. Photo scans use limited free energy, with ads and optional PRO. Keep a matching source for any nutrient number you need to interpret closely.

Frequently asked questions

Is 1 g of salt the same as 1 g of sodium?

No. The NHS conversion described here gives sodium as salt equivalent divided by 2.5. Keep the mass unit consistent when applying the factor.

How much sodium is 1 g salt equivalent?

Divide 1 g by 2.5 to get 0.4 g sodium, equivalent to 400 mg. This is a unit conversion, not a personal intake recommendation.

Should I add salt and sodium values together?

No. They can be related reporting forms for the same composition. Match the receiving field rather than treating the two figures as separate meal additions.

Can I calculate exact restaurant sodium from a photo?

No. A picture does not establish the recipe or seasoning quantities. Converting an estimated value into another unit does not remove that uncertainty.

Keep exploring

• Sugars vs total carbohydrate: which number belongs in a food log?
• Blank vs zero in nutrition data: missing information is not a measured zero
• Match a nutrient value to the consumed serving
• Keep measurement units consistent
• Account for known recipe additions