FDA Rounding Calculator
Instantly convert raw nutrient lab values into FDA-compliant rounded figures. Our engine exhaustively matches specific nutrients (e.g., Sodium vs. Cholesterol) to their exact 21 CFR 101.9 rounding laws for Nutrition Facts labels.
Input Raw Value
The unit dropdown auto-locks based on your nutrient selection to prevent cross-contamination errors (e.g., Sodium only allows mg).
FDA-Compliant Result
FDA Exhaustive Rounding Rules Reference
The exact increments and zero-expression thresholds applied by our engine (21 CFR 101.9 / 101.36).
| Nutrient Category | Express as 0 Threshold | FDA Rounding Increment | Regulatory Citation |
|---|---|---|---|
| Vitamins & Minerals | N/A | <10 (Nearest 0.1) | 10-99 (Nearest 1) | ≥100 (Nearest 10) | 101.36(b)(2)(iii) |
| Sodium & Potassium | < 5 mg | 5-140 mg (Nearest 5 mg) | >140 mg (Nearest 10 mg) | 101.9(c)(4)/(5) |
| Cholesterol | < 2 mg | 2-5 mg (Express as < 5 mg) | >5 mg (Nearest 5 mg) | 101.9(c)(3) |
| Total & Saturated Fat | < 0.5 g | < 5 g (Nearest 0.5 g) | ≥ 5 g (Nearest 1 g) | 101.9(c)(2) |
| Carbs, Fiber, Sugars | < 0.5 g | < 1 g (Express as < 1 g) | ≥ 1 g (Nearest 1 g) | 101.9(c)(6) |
| Calories (Energy) | < 5 kcal | 5-50 kcal (Nearest 5) | >50 kcal (Nearest 10) | 101.9(c)(1) |
Source: FDA 21 CFR 101.9 (Nutrition Facts) & 101.36 (Supplement Facts) — official rounding rules for dietary supplements and conventional foods. See the FDA regulatory text at ecfr.gov — 21 CFR 101.9 and 101.36. The engine above applies the correct rule based on your selected nutrient category.
Related Ingredients
FDA label reference data for nutrients commonly checked with this tool.
Fat-soluble vitamin essential for calcium absorption and bone health. FDA RDI for adults 4+ is 20 mcg (800 IU) per day.
Essential mineral involved in 300+ enzymatic reactions. FDA RDI for adults 4+ is 420 mg per day. Common forms include glycinate, citrate, and oxide.
Trace mineral essential for immune function and wound healing. FDA RDI for adults 4+ is 11 mg per day. Common forms: picolinate, citrate, gluconate.
Essential mineral for oxygen transport. FDA RDI for adults 4+ is 18 mg per day. Mandatory declaration per 21 CFR 101.36(b)(2).
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