How to Read a Nutrition Facts Label, Step by Step

How to Read a Nutrition Facts Label, Step by Step

To read a nutrition facts label, start with the serving size, check how many servings you will actually eat, then use the percent Daily Value: 5% or less of a nutrient per serving is low and 20% or more is high. Aim low on saturated fat, sodium and added sugars, and high on fiber, vitamin D, calcium, iron and potassium.

This guide is for anyone who stands in a grocery aisle comparing two boxes and wants a fast, reliable way to pick the better one without memorizing nutrition science.

Key takeaways

  • Every number on a nutrition facts label refers to one serving, and the serving size is a standardized amount, not a recommendation of how much to eat.
  • The percent Daily Value (%DV) is based on a 2,000 calorie day; 5% DV or less per serving counts as low and 20% DV or more counts as high.
  • The Daily Value for added sugars is 50 grams, for sodium 2,300 milligrams, for saturated fat 20 grams and for dietary fiber 28 grams.
  • Ingredients are listed in descending order of weight, so the first three or four items tell you what the food is mostly made of.
  • Nine major food allergens, including sesame, must be named on US packaged food labels, while "may contain" warnings are voluntary.

What is a nutrition facts label and why should you read it?

A nutrition facts label is the standardized panel on packaged food that lists calories and key nutrients per serving. Reading it lets you compare similar products in seconds and spot the ones loaded with salt, added sugar or saturated fat.

Two jars of pasta sauce can look identical on the shelf and differ by hundreds of milligrams of sodium per serving. Two breakfast cereals with the same health claims on the front can carry very different amounts of fiber.

Label reading matters most for the bread, yogurt, cereal and sauces you buy every week. If you are cutting back on heavily processed foods that are engineered to be hard to stop eating, the label is your first filter.

How do you read a nutrition facts label step by step?

Work from the top down: serving size, calories, the nutrients to limit, the nutrients to get more of, then the ingredient list.

  1. Check the serving size and servings per container. According to the US Food and Drug Administration (FDA), serving sizes reflect what people typically eat or drink and are not a recommendation. If you eat two servings, double every number below it.
  2. Look at calories. Calories measure the energy in one serving. The label's general advice assumes 2,000 calories a day, but your own needs depend on age, sex, height, weight and activity.
  3. Scan the "limit" nutrients. Saturated fat, sodium and added sugars. Here you want lower %DV numbers.
  4. Scan the "get more" nutrients. Dietary fiber, vitamin D, calcium, iron and potassium. Here you want higher %DV numbers.
  5. Apply the 5 and 20 rule. 5% DV or less is low, 20% DV or more is high. That one rule handles most decisions.
  6. Read the ingredient list. The first few ingredients make up most of the product by weight.
  7. Check the allergen statement if you or anyone you feed has a food allergy.

A practical tip from doing this in real shops: compare per serving only when the serving sizes match. If one cracker box lists 15 crackers and the other lists 30 grams, convert in your head or use the "per 100 grams" column some countries print, which makes side by side comparison much easier.

What does percent Daily Value (%DV) mean?

Percent Daily Value shows how much one serving contributes to a reference daily amount of that nutrient, based on a 2,000 calorie diet. It lets you judge "a lot or a little" without doing gram math.

The Daily Value is a reference amount, set by regulators, for how much of a nutrient to aim for or stay under each day. The %DV converts each nutrient into a share of that reference. Here are the reference amounts the FDA uses on the label:

NutrientDaily Value (2,000 calorie diet)Your goalExample: what 20% DV equals
Saturated fat20 gStay below4 g per serving
Sodium2,300 mgStay below460 mg per serving
Added sugars50 gStay below10 g per serving
Dietary fiber28 gMeet or exceed5.6 g per serving
Vitamin D20 mcgMeet or exceed4 mcg per serving
Calcium1,300 mgMeet or exceed260 mg per serving
Iron18 mgMeet or exceed3.6 mg per serving
Potassium4,700 mgMeet or exceed940 mg per serving

The right column is simple arithmetic on the FDA figures, so you can sanity check a label. If a soup shows 920 mg of sodium, that is 40% of the day's reference in one bowl.

Protein is often shown in grams without a %DV, so you may need to judge it against your own target. If protein is your focus, our guide on working out how much protein you need per day gives you a personal target to compare against.

Which numbers on the label matter most?

For most adults, the numbers that make the biggest difference are sodium, added sugars, saturated fat and fiber. These are the nutrients people tend to overshoot or undershoot most often.

Sodium

The Centers for Disease Control and Prevention (CDC) says Americans eat more than 3,300 mg of sodium a day on average, against a recommendation of less than 2,300 mg for teens and adults, and that most sodium comes from processed and restaurant foods. That means the salt shaker is rarely the main problem. Too much sodium is tied to raised blood pressure, which you can read about in our explainer on what your blood pressure numbers mean.

Added sugars vs total sugars

Total sugars include sugars naturally present in milk, fruit and vegetables plus anything added. Added sugars are sugars put in during processing, plus syrups, honey and concentrated fruit or vegetable juices, as the FDA's added sugars page explains. Plain yogurt will show some total sugar from milk and zero added sugar. A flavored yogurt might show the same milk sugar plus 10 g or more added. The Dietary Guidelines advise keeping added sugars under 10% of daily calories, which works out to 50 g on a 2,000 calorie diet. If you want a practical plan for cutting back, see our walkthrough on reducing added sugar step by step.

Saturated fat

Saturated fat has a Daily Value of 20 g, and the goal is to stay under it. Diets high in saturated fat can raise LDL cholesterol; our article on how cholesterol drives heart disease and how to lower LDL covers why that matters.

Dietary fiber

Fiber is the one number most people should push up. With a Daily Value of 28 g, a cereal or bread with 20% DV or more per serving is a strong pick. For cheap ways to close the gap, our list of affordable high-fiber foods is a good shopping list.

Vitamin D, calcium, iron and potassium

These four appear on the label because many people fall short. Fortified milks, cereals and plant drinks can supply a meaningful share of vitamin D. If you're wondering whether food is enough or a supplement makes sense, our piece on vitamin D forms, deficiency signs and safe doses goes deeper.

How do you read the ingredient list?

Ingredients are listed in descending order of weight, so the first few items are what the food is mostly made of. If sugar, oil or refined flour sits in the top three, that tells you more than any front-of-pack claim.

The NHS points out that if the first few ingredients are high-fat items such as cream, butter or oil, the food is likely to be high in fat. The same logic works for sugar. Watch for sugar spread across several names, such as sucrose, dextrose, syrups, honey and fruit juice concentrate. The added sugars line on the panel cuts through that, because it totals them all.

What do front-of-pack colors and per 100 g values mean?

Some countries, including the UK, print traffic light colors on the front of packs and list nutrients per 100 g. Red means high, amber means medium and green means low, so mostly green products are generally the better choice.

Per 100 g values are the fairest way to compare products, because they ignore whatever serving size the maker picked. The NHS gives these cut-offs per 100 g:

  • Total fat: high is more than 17.5 g, low is 3 g or less.
  • Saturated fat: high is more than 5 g, low is 1.5 g or less.
  • Sugars: high is more than 22.5 g of total sugars, low is 5 g or less.
  • Salt: high is more than 1.5 g (0.6 g sodium), low is 0.3 g or less (0.1 g sodium).

Notice the NHS figures use salt, while US labels use sodium. Salt is roughly two and a half times the sodium figure, as the NHS cut-offs above show (1.5 g salt alongside 0.6 g sodium).

How are food allergens shown on labels?

In the US, the nine major food allergens must be named on packaged food, either in parentheses in the ingredient list or in a "Contains" statement right after it. "May contain" warnings are voluntary and not standardized.

The FDA lists the nine major allergens as milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame, with sesame labeling required from January 1, 2023. Tree nuts, fish and shellfish must name the specific type, such as almond, cod or shrimp. Phrases like "produced in a facility that also uses peanuts" are not required by law. Their absence does not prove a food is free of cross-contact, so people with serious allergies should follow their allergist's advice on these products.

Common mistakes when reading food labels

  • Ignoring servings per container. A drink bottle or snack bag can hold two or more servings. Most people finish it.
  • Trusting front-of-box claims. Words like "natural," "multigrain" or "made with real fruit" don't tell you the sodium, sugar or fiber content. Flip the box.
  • Treating all sugar the same. Total sugar in plain milk or unsweetened fruit is not the same as added sugar. Read the added sugars line.
  • Comparing different serving sizes. Convert to the same amount, or use per 100 g values where available.

When labels do not apply: fresh produce, raw single-ingredient meats and fish, and food from many restaurants often carry no nutrition facts panel. For those, focus on how the food is prepared and portioned rather than hunting for numbers.

When to see a doctor

Label reading is an everyday skill, not a treatment. See a doctor or a registered dietitian if any of these apply:

  • You have high blood pressure, heart failure or kidney disease and need a personal sodium or potassium limit, which may be lower than the label's reference amounts.
  • You have diabetes or prediabetes and want help setting carbohydrate and sugar targets.
  • You've had hives, lip or throat swelling, wheezing, vomiting or dizziness after eating. Trouble breathing or throat swelling after food needs emergency care right away.
  • You're losing weight without trying, feel constantly tired, or have signs of a deficiency such as unusual paleness or numbness and tingling.
  • You are pregnant, breastfeeding or feeding a child with a restricted diet and want to be sure nutrient needs are met.

FAQ

Is 5% DV low and 20% DV high for every nutrient?

Yes. The FDA uses the same guide for all nutrients that carry a %DV: 5% or less per serving is low, 20% or more is high. What changes is your goal. You want low numbers for saturated fat, sodium and added sugars, and high numbers for fiber, vitamin D, calcium, iron and potassium.

Why does protein often have no %DV on the label?

On many US labels, protein is shown in grams only, without a percent Daily Value. That means you need to compare it against your own daily target, which depends on body weight, age and activity.

What is the difference between sodium and salt on a label?

Sodium is one component of salt. US labels list sodium in milligrams, while UK and many European labels list salt in grams. The NHS cut-offs pair 1.5 g of salt with 0.6 g of sodium, so a salt figure is about two and a half times the sodium figure. Convert before comparing products from different countries.

Does "no added sugar" mean a food is sugar-free?

No. "No added sugar" means none was added during processing, but the food can still contain natural sugars from fruit, milk or vegetables. Check the total sugars line to see the full amount. For most people, natural sugars in whole fruit and plain dairy are less of a concern than added sugars.

What to do next

  • Pick the three packaged foods you buy most often and read their labels tonight, noting sodium, added sugars and fiber.
  • Next time you shop, compare two versions of one staple, such as bread or cereal, using the 5 and 20 rule.
  • If you have a health condition, ask your doctor or a dietitian for your personal sodium, sugar or carbohydrate targets.

This article is for general information and is not medical advice.

Sources

Last reviewed: October 2026.

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