Last verified 16 Sep 2026 · Sources
The “Calories” line on a Nutrition Facts label has to be calculated using one of six methods FDA specifies in 21 CFR 101.9(c)(1)(i), then rounded: under 5 calories rounds to zero, up to and including 50 rounds to the nearest 5, and above 50 rounds to the nearest 10. It must print in type no smaller than 16 point (10 point in tabular formats), the largest minimum on the whole panel. What used to be a required second line, “Calories from Fat,” was removed by FDA’s 2016 final rule and is gone from every label built to the current standard.
| Quick facts | Calories declaration |
|---|---|
| Regulation | 21 CFR 101.9(c)(1), 101.9(d)(3) |
| Applies to | The "Calories" line on any Nutrition Facts label |
| Key numbers | <5 cal → 0; ≤50 cal → nearest 5; >50 cal → nearest 10. Min type: 16 pt (10 pt tabular). |
The rule
21 CFR 101.9(c)(1)(i) lists the methods you may use to arrive at your calorie number, and any of them satisfies the rule:
- (A) the specific Atwater factors “given in table 13, USDA Handbook No. 74,” the Atwater method by name;
- (B) the general factors of 4, 4, and 9 calories per gram for protein, total carbohydrate, and total fat;
- (C) those same general factors, but with total carbohydrate calculated “less the amount of non-digestible carbohydrates and sugar alcohols”;
- (D) data for specific food factors approved by FDA for particular foods or ingredients;
- (E) bomb calorimetry data, “subtracting 1.25 calories per gram protein to correct for incomplete digestibility”; and
- (F) the specific per-gram factors FDA assigns to individual sugar alcohols (for example, isomalt at 2.0 calories per gram), used when a product’s carbohydrate profile includes them.
FDA doesn’t require a single method for every product line, but the method has to be consistent with how the rest of that product’s nutrient values were derived, since calories and macronutrients come from the same underlying data. 101.9(c)(1)(ii) separately permits declaring “Calories from saturated fat” as an optional, indented line under the calorie count. It is voluntary, not the mandatory “Calories from Fat” line FDA eliminated in its 2016 rulemaking (81 FR 33742, published May 27, 2016). That rule reasoned that “current science supports a view that the type of fat is more relevant than overall total fat intake” and that consumer research showed dropping the line wouldn’t hurt consumers’ ability to judge a product’s healthfulness. Compliance was required by July 26, 2018 for manufacturers with $10 million or more in annual food sales, and July 26, 2019 for smaller manufacturers.
The numbers
| Rule | Requirement |
|---|---|
| Rounding, under 5 calories | May be expressed as zero |
| Rounding, up to and including 50 calories | Nearest 5-calorie increment |
| Rounding, above 50 calories | Nearest 10-calorie increment |
| Minimum type size | 16 point |
| Minimum type size, tabular display | 10 point |
| “Calories from Fat” line | Removed; not required on labels built to the current standard |
| “Calories from saturated fat” line | Optional, indented under Calories, per 101.9(c)(1)(ii) |
Calculation methods, side by side:
| Method | Basis |
|---|---|
| (A) Atwater method | Specific Atwater factors, USDA Handbook No. 74, Table 13 |
| (B) General factors | 4 (protein) / 4 (carbohydrate) / 9 (fat) cal per gram |
| (C) General factors, adjusted carbohydrate | Same as (B), carbohydrate reduced by non-digestible carbohydrate and sugar alcohols |
| (D) Specific food factors | Per-ingredient factors FDA has established |
| (E) Bomb calorimetry | Raw calorimetry data, minus 1.25 cal/g protein for incomplete digestibility |
| (F) Sugar alcohol factors | FDA-assigned per-gram values by specific sugar alcohol |
On the label
Take a granola bar with 8 g protein, 22 g total carbohydrate (including 3 g of a sugar alcohol), and 6 g fat per serving. Using method (B) with the plain 4-4-9 factors: (8×4) + (22×4) + (6×9) = 32 + 88 + 54 = 174, which rounds (above 50) to the nearest 10: 170 calories. Using method (C) or (F) to account for the sugar alcohol’s lower per-gram calories instead, the raw number comes out lower, and the two approaches shouldn’t be mixed on one product. Either way, “Calories” and the number print in 16-point type, the largest text on the panel, with no “Calories from Fat” line beneath it, just the bold “170” and, optionally, an indented “Calories from saturated fat” line.
Mistakes we see
- Still including a mandatory “Calories from Fat” line on a new label, a leftover from a pre-2016 template that a co-packer will flag.
- Mixing calculation methods across a product’s macronutrients (Atwater for fat, straight bomb calorimetry for protein) instead of picking one consistent method.
- Rounding the calorie count to the nearest 5 above 50 calories instead of the nearest 10. The two rounding bands are easy to swap.
- Printing the calorie number in the same type size as the rest of the panel instead of the 16-point minimum that sets it apart.
- Forgetting that sugar alcohols need their own per-gram factor under method (F) rather than being counted at the standard 4 calories per gram of carbohydrate.
Related rules
Calorie rounding is one piece of the broader rounding rules that govern every nutrient on the panel, and the calorie figure feeds directly into %DV calculations for other nutrients. Because the calculation method depends on accurate underlying nutrient data, see database vs. lab analysis for how that data gets sourced in the first place.
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FAQ
Do I still need to list "Calories from Fat"?
No. FDA removed the mandatory 'Calories from Fat' line in its May 2016 final rule (81 FR 33742), with compliance required by July 26, 2018 for larger manufacturers and July 26, 2019 for smaller ones.
How small can a serving's calorie count round before it just becomes zero?
21 CFR 101.9(c)(1) allows amounts less than 5 calories to be expressed as zero. It isn't optional rounding, it's the stated rule for that range.
Which calorie-calculation method is most accurate for a small brand like mine?
FDA doesn't rank the methods in 101.9(c)(1)(i) by accuracy for label purposes; database analysis using specific or general Atwater-type factors is the common approach if you don't have in-house bomb calorimetry.
Is the calorie number the biggest text on the label on purpose?
Yes. 21 CFR 101.9(d)(3) sets a 16-point minimum type size for the calorie declaration, separate from the smaller minimums used for the rest of the panel.
Can I declare "Calories from saturated fat" voluntarily?
Yes, 21 CFR 101.9(c)(1)(ii) permits it as a voluntary, indented line under Calories; it just isn't required the way Calories from Fat used to be.
Related rules
Rounding rules, Percent Daily Value (%DV), Database vs Lab Analysis. See the full all labeling rules.