Nutrition Label Generator

How the Nutrition Label Generator Works

This tool uses the USDA FoodData Central (FDC) API — the official United States Department of Agriculture nutrition database containing over 600,000 food items. When you enter an ingredient like "100g flour" or "2 eggs", the tool parses the quantity, converts units to grams, queries the USDA database for matching nutrient data, and aggregates values across all ingredients. The result is a complete Nutrition Facts panel styled after the FDA's standardized format, covering calories, macronutrients, fiber, sugars, sodium, and key micronutrients.

Nutrient caching is used to speed up repeated lookups — if you recently searched for "flour", the data is stored locally in your browser for up to one hour, so repeat calculations are instant. All processing happens in your browser; your recipe data is never sent to any server except the USDA's public API.

How to Read an FDA Nutrition Label

The US FDA Nutrition Facts panel follows a strict format defined in 21 CFR Part 101. At the top, the serving size tells you the reference amount the rest of the label is based on. Calories per serving is the most prominent number because it is the primary factor most people track. Below calories, you see macronutrients: total fat (broken into saturated and trans fat), total carbohydrates (broken into dietary fiber and total sugars), and protein. Sodium is listed because the average American consumes nearly 3,400 mg daily — well above the 2,300 mg recommended limit.

The % Daily Value (% DV) column helps you judge whether a food is high or low in a nutrient. A % DV of 5% or less is considered low; 20% or more is considered high. These values are based on a 2,000-calorie reference diet. Micronutrients at the bottom — Vitamin D, Calcium, Iron, and Potassium — are highlighted because they are commonly under-consumed in the US diet.

Tips for Accurate Recipe Nutrition

For the most accurate results, weigh ingredients in grams rather than using volume measurements like cups or tablespoons. Volume measures can vary by 20 to 30 percent depending on how tightly packed a substance is — for example, a cup of sifted flour weighs about 100g, but a cup of unsifted packed flour can weigh 150g or more. For eggs, "1 large egg" is standardized at approximately 50g without shell in this tool, based on USDA size definitions. For liquids, 1 cup = 240ml, 1 tablespoon = 15ml, and 1 teaspoon = 5ml.

Cooking method affects some nutrients: boiling can reduce water-soluble vitamins (B vitamins, vitamin C) by 15 to 55 percent, while frying increases fat content. This generator calculates raw ingredient nutrition, which is standard for recipe labels since cooked-weight data varies by method and duration. For a more complete analysis of prepared meals, the USDA Branded Foods database (also included in FoodData Central) contains nutrition data for thousands of ready-to-eat products.

Common Use Cases for Custom Nutrition Labels

Home bakers creating homemade products to sell at farmers markets are often required by local health codes to provide nutrition information. Meal prep services and personal trainers use custom labels to help clients track macronutrients precisely. Food bloggers add nutrition panels to recipes to improve user trust and SEO. Athletes and bodybuilders use the tool to verify protein content in custom meal prep. Parents use it to understand exactly what nutrients are in homemade baby food or snacks for children with dietary restrictions.