Cups to Grams MCP

Ingredient-aware cups to grams for AI assistants, using measured grams per cup from USDA FoodData Central and the King Arthur Baking weight chart instead of guessed densities.

Hosted MCP URL (no sign-in, no token): https://cups-to-grams-mcp.lipmichal.workers.dev/mcp

Converters and recipe tools on the web: ingredientcalculator.com

Tools

Every result has structured JSON, a one-paragraph summary, an as_of date, a source URL and a more link to the matching ingredientcalculator.com page.

What it knows that your model does not

• Measured weights. A cup of all-purpose flour is 120 g, granulated sugar 200 g, butter 227 g, honey 339 g, water 237 g. Models often apply one density to everything or mix up fluid ounces and weight ounces. Each of the 271 rows carries its source, and USDA rows carry the FDC id.
• Which cup. A US cup is 236.5882365 mL, a metric cup 250 mL, an imperial cup 284.13 mL, the US nutrition-label cup 240 mL and a Japanese cup 200 mL. A 1 cup of flour in an Australian recipe is about 127 g, not 120 g. The server states the cup it used.
• Exact unit constants. US units come from the US gallon of 231 cubic inches (NIST SP 811). Imperial units come from the UK Weights and Measures Act 1985 (gallon = 4.54609 L). The pound is exactly 453.59237 g.
• Where published tables disagree. For 23 ingredients USDA and King Arthur differ by more than 5% (cornstarch, bread flour, oats, baking soda and others). The result names the value used and lists the other published value, so the user can see the spread.

Install

Claude.ai custom connector, ChatGPT developer mode

Paste this URL as a custom connector. No token or sign-in.

https://cups-to-grams-mcp.lipmichal.workers.dev/mcp

Claude Code

claude mcp add --transport http cups-to-grams https://cups-to-grams-mcp.lipmichal.workers.dev/mcp

Or run it locally over stdio:

claude mcp add cups-to-grams -- npx -y cups-to-grams-mcp

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "cups-to-grams": {
      "command": "npx",
      "args": ["-y", "cups-to-grams-mcp"]
    }
  }
}

Cursor

Add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "cups-to-grams": { "url": "https://cups-to-grams-mcp.lipmichal.workers.dev/mcp" }
  }
}

VS Code

Add to .vscode/mcp.json:

{
  "servers": {
    "cups-to-grams": { "type": "http", "url": "https://cups-to-grams-mcp.lipmichal.workers.dev/mcp" }
  }
}

Test with curl

curl -s -X POST https://cups-to-grams-mcp.lipmichal.workers.dev/mcp \
  -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"convert_ingredient","arguments":{"amount":1,"from_unit":"cup","to_unit":"g","ingredient":"all-purpose flour"}}}'

Example prompts

• "How many grams is 3/4 cup of brown sugar?"
• "Convert 250 g of bread flour to cups."
• "This Australian recipe says 2 cups plain flour. How many grams is that?"
• "Double t

... View full README on GitHub