Compare soup using the weight or volume you will actually eat. The sodium number on the front of a package can describe a change from an older recipe; the Nutrition Facts panel gives you the quantity needed for a fair comparison. This guide uses US labeling rules.
Read the claim, then the serving size
Scroll the table sideways. With a keyboard, focus the table and use the arrow keys.
| Label term | What it means | How to use it |
|---|---|---|
| Low sodium | 140 milligrams (mg) or less per serving | Check how many servings go into your bowl. |
| Reduced sodium | At least 25% less sodium than the regular version | Compare the actual mg with other soups. |
| Light in sodium | At least 50% less than the regular version | The baseline product still matters. |
| No salt added / unsalted | Salt was not added during processing | Other ingredients may contribute sodium. |
These definitions come from FDA’s Sodium in Your Diet guide. FDA uses a Daily Value of 2,300 mg for sodium. It is a general label reference; use a personally prescribed limit if your clinician has given you one.
Calculate your bowl
Bowl sodium (mg) = label sodium (mg) × bowl amount ÷ label serving amount. Keep both amounts in the same unit. A kitchen scale makes a comparison straightforward when labels use different serving volumes. For condensed soup, first determine whether the panel describes the concentrate or the prepared soup, and follow its preparation basis.
Scroll the table sideways. With a keyboard, focus the table and use the arrow keys.
| Example soup | Label serving | Sodium per labeled serving | Sodium in 360 g |
|---|---|---|---|
| Soup A | 240 g | 360 mg | 360 × 360 ÷ 240 = 540 mg |
| Soup B | 120 g | 280 mg | 280 × 360 ÷ 120 = 840 mg |
Soup B shows the smaller number per serving, yet its serving is half as large. For the same 360 g bowl, Soup A supplies 300 mg less sodium. Relative to FDA’s 2,300 mg Daily Value, these bowls supply about 23% and 37%, respectively. These are invented teaching labels, not current products or recommendations.
For a whole container, use its servings-per-container figure, allowing for rounding, or divide its net food weight by the labeled serving weight. If a fictional 540 g can has Soup A’s composition, the whole can contains about 810 mg sodium: 360 × 540 ÷ 240. Include crackers, cheese, bread and other additions when estimating the meal.
Make the soup you choose work better
- Choose the base first. Compare broth, canned tomatoes, beans and seasoning blends by the quantities in your recipe. “No salt added” beans may make it easier to control the total; read their panel too.
- Build flavor in stages. Warm garlic, onion and spices in a little oil before adding liquid. Finish a serving with herbs, black pepper or a small splash of vinegar, tasting after each addition.
- Count additions honestly. Unsalted vegetables or beans increase the batch volume and contribute their own nutrients. Divide the new batch’s total sodium among the portions you actually serve.
Dilution example: a pot containing 1,200 mg sodium still contains 1,200 mg after you add water. Four equal portions have 300 mg each; two portions have 600 mg each. Water changes the concentration and bowl size, while the number of portions determines the amount eaten.
A quick store routine
- Choose your usual bowl amount and write it down.
- Check the label’s serving amount and preparation instructions.
- Calculate the same portion for two or three options.
- Compare flavor, price, ingredients and sodium together; photograph the label if you want to repeat the purchase.
Open the printable soup sodium worksheet to record two products, your bowl size and toppings. It includes the formula and worked example for use away from this page.