FDA Rounding Calculator
Enter a source amount and select a nutrient category to explore its rounding calculation. Compare the result with the applicable food or supplement labeling rule before using it.
Input Raw Value
The unit dropdown auto-locks based on your nutrient selection to prevent cross-contamination errors (e.g., Sodium only allows mg).
Calculation result
Check the panel and nutrient-specific rule
Food and supplement labels have different declaration conditions and percentage rules. A displayed calculation does not establish whether an ingredient belongs on a panel or whether a package qualifies for a layout. Keep the original amount and units; do not fill an unknown value with zero.
For foods, check 21 CFR 101.9(c). For supplements, check 21 CFR 101.36(b), including nutrient declaration conditions, amounts and %DV. Check other dietary ingredients and blends under 101.36(b)(3) and (c). A general vitamin/mineral example is not a universal precision rule for every botanical or nutrient.
Related Ingredients
FDA label reference data for nutrients commonly checked with this tool.
Vitamin D3: adult/children 4+ Daily Value reference 20 mcg. Confirm the product amount and applicable declaration conditions.
Magnesium: adult/children 4+ Daily Value reference 420 mg. Confirm the product amount and applicable declaration conditions.
Zinc: adult/children 4+ Daily Value reference 11 mg. Confirm the product amount and applicable declaration conditions.
Iron: adult/children 4+ Daily Value reference 18 mg. Confirm the product amount and applicable declaration conditions.
Processing a complex spec sheet?
Bring confirmed finished-product specifications, check every declared amount and serving detail, and review your draft before export.