Label literacy
How to read sodium on a Nutrition Facts label
Read sodium by milligrams, percent Daily Value, serving size, package math, and the exact meaning of low- or reduced-sodium claims.
The sodium line on a Nutrition Facts label shows the total milligrams of sodium in one labeled serving. The percentage beside it shows how that amount relates to FDA’s Daily Value of less than 2,300 milligrams. Start with serving size, then read both the milligrams and percent Daily Value on the sodium row.
Quick read: Sodium is listed per serving, not automatically per package. FDA’s general guide treats 5% Daily Value or less per serving as low and 20% or more as high. Multiply when you eat more than one serving. “Low sodium,” “reduced sodium,” and “no salt added” mean different things, so use the claim as a shortcut and check the current sodium number behind it.
Start with the sodium row and serving size
Find three pieces of information:
- Serving size: the amount all the numbers describe.
- Sodium: the total milligrams in that serving.
- Percent Daily Value (%DV): the serving’s share of FDA’s sodium reference.
A label showing 460 mg sodium and 20% Daily Value means one labeled serving contains 460 mg, which is one-fifth of the 2,300 mg Daily Value.
Serving size reflects the amount people typically eat or drink. FDA says it is not a recommendation of how much you should consume. The amount you actually eat determines how much sodium the product contributes.
The serving-size guide explains how to move between a serving, one piece, and the whole container.
Use the 2,300 mg Daily Value as a label reference
FDA’s Daily Value for sodium is less than 2,300 mg per day for adults and children age 4 and older. On a standard Nutrition Facts label, 2,300 mg equals 100% Daily Value.
Use this formula when you want to check the percentage:
Sodium per serving ÷ 2,300 mg × 100 = sodium %DV
Examples before label-rounding differences:
| Sodium per serving | Calculation | Approximate %DV |
|---|---|---|
| 115 mg | 115 ÷ 2,300 × 100 | 5% |
| 230 mg | 230 ÷ 2,300 × 100 | 10% |
| 460 mg | 460 ÷ 2,300 × 100 | 20% |
| 920 mg | 920 ÷ 2,300 × 100 | 40% |
The label already does this math. Milligrams are useful for adding foods across the day, while %DV makes the amount easier to interpret against one common reference.
Daily Value is not a personalized sodium prescription. A clinician or registered dietitian may give someone a different target based on age, health, medicines, or another factor.
The percent Daily Value guide explains how label references differ from individualized nutrition needs.
Use 5% and 20% as low and high guides
FDA gives this general per-serving guide:
- 5% Daily Value or less is considered low in sodium.
- 20% Daily Value or more is considered high in sodium.
A serving with 4% Daily Value is low by this guide. A serving with 25% is high. Values between those endpoints are neither the low nor high cutoff in the general guide, so read the actual percentage.
For sodium, the Daily Value is framed as an amount to stay below. Several foods that look moderate by themselves can add up across meals, drinks, condiments, and snacks.
Do not add percentages vertically down one product’s label. Add sodium only with sodium. Ten percent sodium from one food plus 15% sodium from another equals 25% of the sodium Daily Value; combining sodium with calcium or fiber percentages has no useful meaning.
Multiply for the amount you actually eat
Nutrition Facts usually describes one serving. If you eat two servings, double both the sodium milligrams and %DV.
Suppose a package lists:
- serving size: 1 cup;
- servings per container: 2.5;
- sodium per serving: 480 mg; and
- sodium per serving: 21% Daily Value.
Eating the full package provides:
480 mg × 2.5 servings = 1,200 mg sodium
The percentage is about:
21% × 2.5 servings = 52.5% Daily Value
Because printed percentages can be rounded, calculating from the listed milligrams may be more precise. Some packages use a dual-column label with separate “per serving” and “per package” values. Use the column matching what you eat instead of multiplying it again.
Put two foods on the same portion basis
A smaller labeled serving can make the sodium number look lower. For a literal side-by-side calculation, use the same food amount or the amount you expect to eat.
| Label detail | Soup A | Soup B |
|---|---|---|
| Labeled serving | 1 cup | 1/2 cup |
| Sodium per serving | 400 mg | 250 mg |
| Sodium per cup | 400 mg | 500 mg |
Soup B has fewer milligrams in its labeled serving, but that serving is half as large. On a one-cup basis, Soup A has the lower sodium amount. This calculation answers one narrow label question; it does not declare either food better overall.
For concentrated products such as sauces, seasoning packets, or soup bases, decide whether the label describes the concentrate or the prepared food. Follow the preparation directions before treating two numbers as equivalent.
Read sodium claims by their exact meaning
FDA defines common front-of-package sodium claims per serving:
| Claim | What the FDA definition means |
|---|---|
| Sodium-free or salt-free | Less than 5 mg sodium per serving |
| Very low sodium | 35 mg sodium or less per serving |
| Low sodium | 140 mg sodium or less per serving |
| Reduced sodium | At least 25% less sodium than the regular product |
| Light in sodium or lightly salted | At least 50% less sodium than the regular product |
| No salt added or unsalted | No salt was added during processing; the food may still contain sodium |
The key distinction is absolute versus relative. “Low sodium” has an absolute ceiling per serving. “Reduced sodium” is relative to a regular reference product. A 25% reduction can still leave a substantial sodium amount when the regular version starts high.
“No salt added” does not mean sodium-free. Sodium can occur naturally or come from ingredients other than added table salt. Read the Nutrition Facts number after reading the claim.
Separate sodium from salt and salty taste
Sodium and table salt are related, but they are not interchangeable words. Table salt is sodium chloride; sodium is one mineral within it.
The sodium number includes sodium from all ingredients, not only salt added at the table. FDA lists examples such as:
- monosodium glutamate (MSG);
- sodium bicarbonate, or baking soda;
- sodium nitrite; and
- sodium benzoate.
Taste is not a reliable sodium measurement. Foods such as breads, cereals, and pastries may contribute sodium without tasting strongly salty. A salty taste also cannot tell you the milligrams in a serving. Use the label.
CDC reports that most sodium comes from processed and restaurant foods. Repeated foods can matter even when one serving does not cross the 20% high threshold.
Avoid common sodium-label mistakes
Keep these points straight:
- The sodium amount is per serving. Multiply when you eat more than one serving.
- The Daily Value is less than 2,300 mg. It is a common label reference, not a personal prescription.
- Five percent is low and 20% is high per serving. Foods across the day still add together.
- Reduced does not mean low. Reduced sodium is relative to the regular product.
- No salt added does not mean sodium-free. Check the milligrams.
- Salt and sodium are not identical. Other sodium-containing ingredients count in the total.
- Taste is not a measurement. Foods that do not taste salty can contain sodium.
- Serving sizes must match for side-by-side math. Convert to a common amount first.
This guide explains Nutrition Facts math and U.S. label claims. It does not diagnose a condition or set an individualized sodium target. Follow any sodium guidance you have received from a qualified clinician or registered dietitian.
Sodium label FAQ
What does sodium mean on a Nutrition Facts label?
It is the total milligrams of sodium in one labeled serving, including sodium from salt and other sodium-containing ingredients. Read it beside serving size and percent Daily Value.
How much sodium is 10% Daily Value?
On a standard label using FDA’s 2,300 mg Daily Value, 10% is 230 mg sodium. The calculation is 2,300 mg × 0.10 = 230 mg.
What is the difference between low sodium and reduced sodium?
Low sodium means 140 mg or less per serving. Reduced sodium means at least 25% less than the regular reference product. A reduced-sodium food does not automatically meet the low-sodium limit.
Does no salt added mean no sodium?
No. It means salt was not added during processing. The food can still contain naturally occurring sodium or sodium from other ingredients, so check the milligrams on the Nutrition Facts label.
Is sodium the same as salt?
No. Table salt is sodium chloride, while sodium is one mineral within salt. The label’s sodium total also includes sodium supplied by ingredients such as baking soda, MSG, sodium nitrite, and sodium benzoate.