Free recipe calorie and allergen calculator
Get calories, nutrients and an allergen statement for a dish from its ingredients and gram weights.
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How do you calculate calories in a recipe?
Look up each ingredient's nutrients per 100 grams, scale them to the gram weight in one portion, and add them up. This tool does that from USDA nutrient data and reads the labels of branded components for allergens.
Fill in the prompt
Edit the details in brackets with the recipe with gram weights per portion and the brands of packaged components, then pick the AI assistant to run it in.
Firecrawl Alexandria runs the lookups
Your assistant calls 5 tools in order, from USDA FoodData Central (fdc.nal.usda.gov), Open Food Facts and FDA, and cites the record behind every figure.
Get the answer
You get calories and main nutrients per portion with a per-ingredient table, an allergen statement, and any recalls for your supplier brands. Anything a source couldn't find is marked, not guessed.
Who is the free recipe calorie and allergen calculator for?
Anyone who needs calories and allergens for a dish before it goes on a menu.
Chefs
Get a calorie estimate and allergen list for a new dish from its recipe.
Menu developers and chain R&D
Draft nutrition cards for new items before menus print.
Food service directors
Check branded components for allergens and recalls from your suppliers.
Where does the data come from?
From the sources below, called in order through Firecrawl Alexandria. Each row shows the call's price in credits and its track record across every agent. Empty means the call worked and found nothing.
USDA FoodData Central (fdc.nal.usda.gov)Search foodsPrice5 creditsMedian435 msSuccess100%Empty0%
Open Food FactsSearchPrice5 creditsMedian717 msSuccess100%Empty0%
FDAFood recallsPrice5 creditsMedian–Success–Empty–
What steps does the assistant follow?
The tool's written instructions: which data source to call at each step, what to pull from it and how to lay out the answer. Copy them into any assistant connected to Firecrawl with an API key to run the tool from your own chat.
Explore more free tools
Ready-made prompts for ChatGPT, Claude and other assistants, each backed by the data sources it names.
Frequently asked questions
- How accurate is it?
- It's an estimate built from USDA nutrient data and product labels. Cooking losses and oil uptake aren't modelled, and menu labelling should be confirmed before it's printed.
- How does it find allergens?
- It reads the allergen and ingredient lists of branded components such as sauces, breads and cheeses, and checks food recalls for each supplier brand.
- Is this tool free?
- Yes. The prompt, the steps and the instructions are free to use. When your assistant runs the tool through Firecrawl Alexandria, each data call bills its listed price in credits, and every data source shows that price before it's called.
- Which AI assistants can run it?
- Any assistant connected to Firecrawl with an API key, including ChatGPT, Claude, Claude Code, Codex and Cursor. Pick one in the prompt box and your request opens there with a link to this tool.
- Do I need to sign up?
- You need a Firecrawl account, with your assistant connected through its API key. Firecrawl Alexandria doesn't run in keyless mode. If your assistant isn't connected yet, the prompt tells it how to set that up. Some data providers ask an admin on your Firecrawl team to accept their terms before the first call.