Reading nutrition labels for sodium step by step

Reading nutrition labels for sodium comes down to one column: %DV. Sodium sits partway down the Nutrition Facts panel, listed in milligrams with a %DV figure beside it. The FDA treats 5% DV or less as low sodium and 20% DV or more as high — and both numbers are calculated per serving, which is where most people get tripped up.

Reading nutrition labels: where sodium appears and what the numbers mean

On the standard U.S. Nutrition Facts panel, sodium is listed a few lines below calories and fat, always in milligrams, always with a %DV figure to its right. The milligram number tells you the absolute amount in one serving. The %DV tells you how that amount compares to a 2,300mg daily reference — the same FDA Daily Value covered in what counts as a healthy daily sodium intake.

The %DV is the faster number to scan once you know how to read it. The FDA's own rule of thumb: 5% DV or less per serving counts as low sodium, and 20% DV or more counts as high. Anything in between is moderate. You don't need to do the milligram math in your head at the grocery store — the %DV column has already done it, as long as you know what counts as low and what counts as high.

%DV for sodium	What it means	FDA classification
5% or less	~115mg or less per serving	Low sodium
6-19%	Roughly 140-435mg per serving	Moderate
20% or more	~460mg or more per serving	High sodium

A few products state sodium content differently — some list milligrams of sodium, others (less commonly, on certain reduced-sodium claims) reference grams of salt. If you need to convert between the two, sodium vs. salt walks through why they're not the same unit and how the math works.

The serving-size trap

Serving size is where an otherwise correct label reading often goes wrong. The sodium number and %DV on the panel are both calculated per serving — and the serving size on the package is not always the amount you're actually going to eat.

Take a bag of chips labeled "2 servings per container" with 380mg of sodium per serving. If you eat the whole bag — which a lot of people do, especially with smaller bags marketed as single portions — you've eaten 760mg, not 380mg. The label isn't lying; it's reporting one serving, and it's on you to multiply by however many servings you actually ate.

This trap shows up constantly with:

Canned soup — a can often lists "about 2 servings," so a bowl that looks like a normal meal can be double the label's headline sodium number.
Frozen entrées — some list the whole tray as one serving, others split it into two; always check before assuming.
Snack bags — chips, crackers, and pretzels frequently list 2-3 servings per bag even when the bag reads as a single snack occasion.
Bottled sauces and dressings — a serving is often just 2 tablespoons, far less than what most people actually pour.

The fix is simple but easy to skip: before you look at the sodium number, check the servings-per-container line at the top of the label, and check whether that matches how much you're really about to eat. If you're eating the whole container, multiply the sodium number by the total servings, not just the serving size in front of you.

What front-of-package sodium claims actually mean

Packaging often makes sodium claims before you even flip the box over, and those terms are FDA-regulated, not marketing fluff — though they're easy to misread if you don't know the definitions:

Sodium free — less than 5mg per serving.
Very low sodium — 35mg or less per serving.
Low sodium — 140mg or less per serving.
Reduced sodium — at least 25% less sodium than the regular version of that product, which doesn't necessarily mean the result is low in absolute terms.
Light in sodium — at least 50% less sodium than the regular version.

The gap between "reduced sodium" and "low sodium" is the one that catches people. A "reduced sodium" soup can still land well above 140mg per serving, or even in the "high" 20%-DV range, if the regular version it's compared to was extremely high to begin with. The claim on the front is relative to that brand's own regular product, not an absolute standard — so it's still worth checking the actual milligram number and %DV on the back rather than trusting the front-of-box wording alone.

Reading a label in under 10 seconds

Once you know what to look for, the process is fast:

Check servings per container first, and decide how many servings you're actually eating.
Find the sodium line and its %DV.
Multiply the sodium milligrams by your real serving count if it's more than one.
Use the 5%/20% rule to judge whether that total is low, moderate, or high relative to a 2,300mg day.

That's the whole process — no conversion charts, no guesswork about what "high sodium" means, just the label's own numbers read in the right order.

Skipping the math with barcode and photo logging

Doing this by hand for every item in a shopping cart or a pantry is realistic for a week of careful attention and not much longer than that — most people's habits slide back once the label-reading gets tedious. Sodium Tracker is an iPhone app that logs food against a daily sodium limit set from FDA, AHA, and WHO guidance, with fast logging by barcode, photo, or voice, and a library of high-sodium foods — scanning a barcode or snapping a photo pulls the label's actual sodium number in automatically, serving-size math included, instead of you doing the %DV arithmetic by hand every time.

FAQ

What is a high sodium %DV on a nutrition label?

The FDA considers 20% DV or more per serving to be high in sodium, and 5% DV or less to be low. Anything between those two figures falls into a moderate range. This applies per serving as listed on the label, not per package.

Where is sodium listed on a nutrition facts label?

Sodium appears a few lines below total fat and cholesterol, listed in milligrams with a %DV column beside it. It's a standard, required line on every U.S. Nutrition Facts panel.

Why does a food have more sodium than the label says?

Usually because the package contains more than one serving and you ate more than the labeled serving size. The milligram and %DV figures are both calculated per serving, so eating the whole container means multiplying the label's numbers by the total servings, not just reading the printed figure as-is.

What percent daily value of sodium should I aim for in a day?

The %DV column is built around the FDA's 2,300mg Daily Value, so getting to 100% DV across a full day roughly matches that target. If you're aiming for the AHA's more conservative 1,500mg limit, treat about 65% DV as your rough daily ceiling instead.