% Daily Value Explained: What It Means and How to Calculate It

The % Daily Value (%DV) column is the part of the Nutrition Facts label most people glance at and few understand. For shoppers, it's a quick way to compare foods. For producers, it's a calculation that has to be done exactly the FDA way.

What %DV actually tells you

%DV shows how much one serving contributes to a full day's reference amount of a nutrient, based on a 2,000-calorie diet used for general nutrition advice. If a serving of crackers lists sodium at 10% DV, one serving provides about a tenth of the daily sodium reference of 2,300 mg.

The required footnote sums it up: "The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice."

The current Daily Values

FDA uses two kinds of reference values. Daily Reference Values (DRVs) cover nutrients like fat and sodium. Reference Daily Intakes (RDIs) cover vitamins and minerals. On the label, they're all called "Daily Values". For adults and children 4 years and older, FDA lists:

Choline, which is optional, has a Daily Value of 550 mg. The 2016 update changed several of these values. Sodium dropped from 2,400 mg to 2,300 mg, and fiber rose from 25 g to 28 g. If your software still uses the old numbers, your %DVs are wrong.

How to calculate %DV

The formula is simple:

> %DV = (amount per serving ÷ Daily Value) × 100

A cookie serving with 140 mg of sodium: 140 ÷ 2,300 × 100 = 6.09, so the label shows 6%.

The detail that matters: under 21 CFR 101.9(d)(7)(ii), you can divide either the declared (rounded) amount or the actual (unrounded) amount by the Daily Value. Both are allowed, but pick one method and use it consistently. That's why two correct labels for the same food can differ by a percent. Protein is the exception. Its %DV uses a quality-corrected calculation (see below).

Rounding the %DV

- For macronutrients like fat, sodium, and carbohydrate, round %DV to the nearest whole percent. - For vitamins and minerals, 21 CFR 101.9(c)(8)(iii) uses coarser steps: - Nearest 2% up to and including 10% - Nearest 5% above 10% and up to 50% - Nearest 10% above 50% - A vitamin or mineral present at less than 2% of its Daily Value can be declared as 0%, or marked with a symbol that refers to a footnote such as "Contains less than 2% of the Daily Value of this nutrient".

Vitamin D, calcium, iron, and potassium are listed with both the amount (mcg or mg) and the %DV.

Nutrients with no %DV

• Trans fat: no Daily Value has been set.
• Total sugars: no Daily Value. Only added sugars has one, at 50 g.
• Protein: %DV is optional unless you make a protein claim, or the food is meant for children under 4. If you do declare protein %DV, FDA requires it to be adjusted for protein quality (the PDCAAS method). That's one reason many labels leave it off.

Labels for young children

Foods for children 1 through 3 years use their own Daily Values. Some examples:

• Fat: 39 g
• Saturated fat: 10 g
• Sodium: 1,500 mg
• Carbohydrate: 150 g
• Fiber: 14 g
• Protein: 13 g
• Added sugars: 25 g

The footnote uses 1,000 calories instead of 2,000. Foods for infants through 12 months don't show %DV for saturated fat, trans fat, cholesterol, sodium, fiber, total sugars, or added sugars, and carry no footnote. Use our children 1–3 format or the infants through 12 months format, which build in these rules.

The 5% / 20% rule of thumb

FDA's consumer guidance offers a simple shortcut:

• 5% DV or less per serving is low.
• 20% DV or more per serving is high.

Shoppers use it to choose more of what they want (fiber, vitamin D, calcium, potassium) and less of what they're limiting (sodium, saturated fat, added sugars). It's a reading aid, not a claim standard. "Low sodium" and "high fiber" have their own legal definitions in 21 CFR 101.13 and related sections, and you'd have to meet those to put the words on the package.

Common %DV mistakes

1. Using pre-2016 Daily Values, such as 2,400 mg sodium or 25 g fiber.
2. Calculating from an unrounded amount where FDA expects the declared amount, or the other way round.
3. Rounding vitamin and mineral %DV to whole numbers instead of 2/5/10 steps.
4. Adding a %DV for total sugars or trans fat.
5. Showing a protein %DV without the quality adjustment.

Worked example: a full %DV calculation

Here's a homemade 40 g granola bar with these declared amounts per serving:

Two details to notice. Total carbohydrate at 9.45% rounds to 9%, because macronutrients go to the nearest whole percent. Calcium at 3.1% becomes 4%, because minerals go to the nearest 2% step.

At a glance, a shopper using the 5%/20% rule would see this bar as low in sodium, and fairly high in added sugars at 18%.

%DV on dual-column and multi-column labels

Each column on a dual-column label gets its own %DV, calculated from that column's amount. On a per-serving and per-container label, a 2.5-serving bottle with 200 mg of sodium per serving shows 9% in the serving column (200 ÷ 2,300). The container column shows 22% (500 ÷ 2,300). Don't multiply the rounded serving %DV by the number of servings. Calculate each column from its own amount. Our dual-column format does this automatically. Labels with columns for both infants and children 1–3 use each group's own Daily Values.