Free nutrition tools

Calculators for reading food facts

Five free, instant tools for turning label numbers into something useful: portion calories, percent Daily Value, macro energy, calorie density, and side-by-side comparison. No sign-up, all grounded in USDA data.

5
Tools
Free
No sign-up

GetFoodFacts offers free, no-login nutrition calculators built on USDA data: a food calorie calculator scales a selected food to your portion in grams, a macro calculator turns protein, carbs, and fat into energy, a Daily Value calculator explains %DV, and a calorie-density classifier reads calories per 100 g. Each runs in your browser and explains its source basis.

Which nutrition tool do you need?

Labels

Daily Value (%DV) Calculator

Turn any nutrient amount into its percent Daily Value against the FDA reference figures on the Nutrition Facts label.

Open tool → Energy

Macro Calculator

Convert grams of protein, carbohydrate, and fat into total calories and the percentage each macro contributes.

Open tool → Portions

Food Calorie Calculator

Search a USDA food, enter a portion in grams, and scale its calories and macros from the recorded per-100 g values.

Open tool → Portions

Calorie Density Classifier

Find a food’s calories per 100 g and where it sits on the very-low to very-high density scale used in volume eating.

Open tool → Compare

Compare Foods

Put two USDA foods side by side and read their calories, macros, vitamins, and minerals in one colour-coded view.

Open tool →

According to the U.S. Food and Drug Administration and the U.S. Department of Agriculture, whose published reference values anchor every tool here, the Daily Values and the Atwater energy factors apply across more than 2,000,000 foods catalogued in the GetFoodFacts database (April 2026 release). Each calculator links back to the foods and rankings in that database so you can move from a number to a real food in one step. GetFoodFacts documents how the data is sourced and refreshed on the methodology page.

What's in the archive

Each calculator only works when the food you look up has the field it needs. Here's how many of the 2,013,644 foods in the database carry each core nutrient field.

Calories88.9%Total Carbohydrate84.7%Sodium80.6%Protein71.5%Total Fat66.4%Dietary Fiber51.3%
Share of foods with each field populated

Key takeaways

  • Calories is the most reliably populated field, present on 88.9% of the 2,013,644 foods in the database -- while dietary fiber is present on only 51.3%, so a calculator result can come back empty for some foods depending on which field it needs.
  • The Daily Value and macro calculators work on any food with the relevant field populated; if a lookup comes back empty, that food simply doesn't carry that nutrient value in the source data. Try the %DV calculator
  • All 5 calculators recompute instantly as you type, with no page reload and no account or sign-up required.

Download the USDA food-group nutrition extract cited on this page: getfoodfacts-category-nutrition-statistics.csv or the JSON distribution (public domain / CC0).

Data provenance

How this page is sourced

Every figure on GetFoodFacts is rendered directly from official USDA FoodData Central records, no number is typed in by an editor. Read our editorial standards and corrections policy, the methodology behind these numbers, or report a data error. Data current as of April 2026.