About NutriFactsHub

The site is organized around two jobs. For people putting a product on a shelf, we generate FDA Nutrition Facts and Supplement Facts labels and calculate the nutrition of a recipe. For people managing their own diet, we offer macro, TDEE, calorie-deficit, protein, and water calculators, a meal plan generator, a food database, and nutrition rankings. Everything is free to use.

All food and nutrient data comes from the U.S. Department of Agriculture, Agricultural Research Service, FoodData Central — primarily the Foundation Foods and SR Legacy datasets, which are analytically derived reference values in the public domain. Each food page links to its specific FoodData Central record by its FDC ID, so you can trace any figure back to source.

Label formats and rounding follow the U.S. Food & Drug Administration’s 2016 Nutrition Facts label regulations. We do not invent, estimate, or “fill in” nutrition values: if a number is not in the underlying USDA record, it is not shown.

Labels. Nutrition Facts labels use the FDA 2016 vertical format and the rounding rules in 21 CFR 101.9(c) — for example, calories rounded to the nearest 5 below 50 and nearest 10 above, and fats rounded to the nearest 0.5 g below 5 g. Final regulatory compliance, including serving-size determination and allergen statements, remains the manufacturer’s responsibility.

Calculators. Calorie and macro estimates use the Mifflin-St Jeor equation for basal metabolic rate, switching to Katch-McArdle when a body-fat percentage is provided. Activity multipliers run from 1.2 (sedentary) to 1.9 (extra active), and macronutrient grams are derived at 4 kcal per gram for protein and carbohydrate and 9 kcal per gram for fat. Each calculator page states the equation it uses.

Derived metrics. On food pages and rankings we compute several values from the source data: the share of calories from each macronutrient (Atwater factors), calorie density (kcal per 100 g), and protein density (grams of protein per 100 kcal). “Good source” and “excellent source” labels follow the FDA nutrient-content-claim thresholds in 21 CFR 101.54 — 10 to 19% of the Daily Value, and 20% or more, respectively, evaluated per serving.

We hold to a few simple rules. Numbers come from cited, public sources — never fabricated or AI-generated. Where a figure is a typical value that varies with variety, ripeness, or preparation, we say so. Derived metrics are defined in plain language with their formula and source on the page. When we describe a method or threshold, we link to the governing standard.

Content is reviewed for accuracy on an ongoing basis; pages carry a “last reviewed” date. If you spot an error, please tell us and we will correct it.

NutriFactsHub is an independent project and is not affiliated with, endorsed by, or sponsored by the FDA, the USDA, or any government agency. References to those bodies describe the standards and data we rely on, nothing more.

The tools are free. If we introduce paid features or other ways to support the site in future, we will say so plainly and keep the core tools accessible.

The information and calculators here are for general educational purposes and are not medical advice, a diagnosis, or a treatment plan. Nutritional needs vary, especially during pregnancy, illness, or while taking medication. Consult a qualified physician or registered dietitian before making significant changes to your diet.

Questions, corrections, or feature requests are welcome — reach us through the contact page.

Last reviewed: June 2026.