How the FDA Rounds Calories (and Everything Else)

You can't print your calculator's output on a label. FDA regulations prescribe exact rounding increments for every nutrient — a label showing "247 calories" is non-compliant even if it's arithmetically true.

Calories: 0, 5s, then 10s

Per 21 CFR 101.9(c)(1):

• Less than 5 calories → may be expressed as 0
• 50 calories or less → round to the nearest 5 (247 would be wrong; 45 or 50 is right at that range)
• More than 50 → round to the nearest 10 (so 247 → 250)

Worked example: calculate first, round last

Suppose the ingredient calculation for a batch gives 2,964 calories, and the batch makes 12 servings. These are illustrative inputs, not nutrition data for a particular recipe.

Step	Calculation	Value
Unrounded batch total	Sum of ingredient contributions	2,964 calories
Unrounded amount per serving	2,964 ÷ 12	247 calories
Declared amount per serving	Round 247 to the nearest 10	250 calories

Keep the unrounded values for the calculation and apply the label rounding to the final per-serving amount. If the same batch instead makes 24 servings, it contains 123.5 calories per serving before rounding and displays 120. This is why the serving-size decision comes before the final label.

The full rounding table

Nutrient	Rule (21 CFR 101.9(c))
Total, saturated, trans fat	<0.5g → 0; <5g → nearest 0.5g; ≥5g → nearest 1g
Cholesterol	<2mg → 0; 2–5mg → "less than 5mg" allowed; above → nearest 5mg
Sodium	<5mg → 0; 5–140mg → nearest 5mg; >140mg → nearest 10mg
Total carbohydrate, fiber, sugars, added sugars, protein	<0.5g → 0; <1g → "less than 1 gram" allowed; ≥1g → nearest 1g

%DV has its own rules

Percent Daily Values for macronutrients round to the nearest whole percent (101.9(d)(7)(ii)). Vitamins and minerals use stepped increments (101.9(c)(8)(iii)): up to 10% of the daily value → nearest 2%; from 10% to 50% → nearest 5%; above 50% → nearest 10%. Below 2%, the nutrient may be omitted with a "Not a significant source of…" note.

Notably, trans fat and total sugars have no %DV at all — a label showing one is wrong.

Why this matters for compliance

An inspector comparing your label to an analysis expects the label's numbers to be the rounded values, not the raw ones. And compliance tolerances (see our lab analysis guide) are measured against what you declared. Labelara separates calculation values from label display rounding; its methodology explains that process and the data limitations you still need to review.