Most food entrepreneurs assume nutrition labels require laboratory testing. They don\'t. The FDA explicitly permits calculated nutrient values derived from ingredient databases — and for the vast majority of small food businesses, calculation is faster, cheaper, and accurate enough to satisfy compliance. This guide walks through the exact workflow: from raw recipe to FDA-compliant nutrient values.
Step 1: Document Your Recipe With Exact Gram Weights
The single biggest source of nutrition label errors is imprecise ingredient measurement. "1 cup of flour" weighs anywhere from 120g to 150g depending on how it\'s scooped — a 25% variance that propagates through every downstream calculation. Use a kitchen scale and record every ingredient in grams.
Write your recipe in a table with three columns: ingredient, gram weight, and the final cooked yield. For example:
| Ingredient | Raw weight (g) |
|---|---|
| All-purpose flour | 240 |
| Granulated sugar | 150 |
| Unsalted butter | 170 |
| Large eggs (2) | 100 |
| Whole milk | 120 |
| Total raw weight | 780 g |
| Final baked weight | 680 g (after evaporation) |
Step 2: Look Up Each Ingredient in USDA FoodData Central
Visit fdc.nal.usda.gov — the USDA\'s free nutrient database. Search for each ingredient and record the per-100g nutrient values for everything required on the FDA label: calories, total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, total sugars, added sugars, protein, vitamin D, calcium, iron, and potassium.
Three database categories matter:
- Foundation Foods — the most rigorously analyzed entries. Prefer these when available. Identified by an "FNDDS" code.
- SR Legacy — the historical Standard Reference database. Reliable but older. Good fallback when Foundation Foods doesn\'t cover an ingredient.
- Branded Foods — manufacturer-submitted data. Useful for commercial products you use as ingredients (specific brands of cheese, packaged sauces, etc.).
Step 3: Multiply Each Ingredient by Its Weight
For each ingredient, multiply the per-100g nutrient value by the ingredient weight (in 100-gram units). Example: butter has roughly 81g of fat per 100g. Your 170g of butter contributes:
170g × 81g/100g = 137.7g total fat
Do this for every nutrient × every ingredient. A spreadsheet makes this manageable. Sum each column to get the total nutrient amount in your entire batch.
Step 4: Divide by Servings to Get Per-Serving Values
Use your final cooked weight and the FDA-required Reference Amount Customarily Consumed (RACC) for your product category to determine servings per batch.
Example: A 680g baked product in the "muffin / quick bread" RACC of 55g per serving produces:
680g ÷ 55g = 12.4 → 12 servings per container (FDA permits rounding down)
Then divide every batch nutrient total by 12 to get per-serving values. Apply FDA rounding rules at this stage (e.g., round saturated fat to nearest 0.5g below 5g, nearest 1g above).
Step 5: Calculate Percent Daily Values
For each nutrient with an FDA-established Daily Value, divide the per-serving amount by the DV and multiply by 100. Round to the nearest whole percent. Daily Values to use (post-2020):
- Total Fat: 78g
- Saturated Fat: 20g
- Cholesterol: 300mg
- Sodium: 2,300mg
- Total Carbohydrate: 275g
- Dietary Fiber: 28g
- Added Sugars: 50g
- Protein: 50g (only used if a protein claim is made)
- Vitamin D: 20mcg
- Calcium: 1,300mg
- Iron: 18mg
- Potassium: 4,700mg
Common Errors and How to Avoid Them
Error 1: Not accounting for cooking weight loss
A recipe that uses 780g raw ingredients but yields a 680g baked product loses ~13% of its weight to evaporation. If you divide by raw weight instead of cooked weight, your per-serving values will be ~15% too low. Always use the post-cooking final yield.
Error 2: Using "raw" values for cooked products
FoodData Central distinguishes raw vs cooked entries. Boiled potatoes have different nutrients than raw potatoes (especially vitamin C). Use the cooked entry when the final product is cooked.
Error 3: Forgetting to add Added Sugars
Any sugar you added during preparation counts as Added Sugars — granulated sugar, brown sugar, honey, maple syrup, agave, molasses, fruit juice concentrate. Lactose in milk and naturally occurring fructose in whole fruit do NOT count as Added Sugars.
Error 4: Wrong serving size
Use the FDA-defined RACC for your product category — not your preferred serving size. The 2020 update revised many RACCs; using outdated values is a common compliance issue. The RACC table is in 21 CFR 101.12.
Sanity-Check Your Numbers
Before printing labels, do a final sanity check:
- Add up your fat × 9 + carbs × 4 + protein × 4 calculations. The total should be within 10% of your declared calorie count.
- Saturated fat should always be less than total fat (and trans fat less than saturated).
- Added sugars should never exceed total sugars.
- Dietary fiber should be less than total carbohydrate.
- If a calculated value is dramatically higher or lower than similar products in the same category, double-check your work — you\'ve likely made a unit conversion or measurement error.
When to Use Lab Testing Instead
Calculation is appropriate for most retail food products. Lab analysis becomes necessary when:
- You make a specific nutrient claim ("Excellent source of Vitamin D", "Low sodium") — claims require lab verification.
- Your product enters major retail (Walmart, Costco, Whole Foods sometimes require COAs).
- Your product is exported and the receiving country requires certified analysis.
- Your formulation includes unusual ingredients not well-represented in FoodData Central.
- You\'re developing nutrient-functional products (protein bars, fortified beverages) where precision matters for marketing.
See our label vs lab testing decision guide for a detailed cost-benefit analysis. For most other products, calculation + our free generator produces FDA-compliant labels in 10 minutes.