Cups to Grams

io.github.theluckystrikePublished by GitHub account theluckystrikev1.0.0Updated Nov 6, 2026

Cups to grams for 271 ingredients with USDA and King Arthur densities, recipe scaling, oven temps.

VerifiedStreamable HTTPWeb executableLocation & LifestyleData & Analytics

Overview

AI-generated overview

Converts cooking amounts between cups, spoons and grams for 271 ingredients, scales recipe lines, and converts oven temperatures.

What you can do
  • Search the ingredient table by fuzzy name and see grams per cup and tablespoon with the published source
  • Convert amounts between volume and weight units for a named ingredient, including metric, imperial and Japanese cups and sticks of butter
  • Scale recipe ingredient lines by a factor or from one serving count to another, optionally giving grams per line
  • Convert oven settings between Fahrenheit, Celsius and gas mark, with an optional fan-oven adjustment
When to use it
Useful when an assistant has to answer baking and cooking questions that depend on real measured ingredient weights, such as turning a recipe's cups into grams, rescaling a recipe, or translating oven temperatures between regions.
Requirements
Nothing to install for the hosted endpoint; it needs no sign-in or token. A local stdio variant is offered through an npx package, which requires Node.js. Network access is needed for the remote endpoint.
Before you install
Results are reference values, not measurements: dry volumes assume spoon-and-level filling, table values are rounded to whole grams, and fuzzy ingredient matching can pick the wrong row, so the matched name should be checked. Whole eggs and other count items are not converted by volume. Fan-oven guidance is a rule of thumb.

Installation

In SourceWeft

  1. Open Cups to Grams in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.theluckystrike%2Fcups-to-grams-mcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

README

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

ToolWhat it does
convert_ingredientConverts an amount between volume and weight for a named ingredient (cup, tbsp, tsp, fl oz, mL, L to g, oz, lb and back). Supports US, metric, imperial, US legal and Japanese cups, US, metric and Australian spoons, sticks of butter. Says which cup it used and cites the density source.
search_ingredientsFuzzy search over 271 ingredients. Returns canonical names, grams per US cup and per tablespoon, and the source (USDA FDC id or King Arthur chart).
scale_recipeScales ingredient lines by a factor or from one servings count to another. Parses mixed numbers and fraction characters. Optionally gives grams for every line.
convert_oven_temperatureFahrenheit, Celsius and gas mark (1/4 to 10), with a 20 C fan oven adjustment.

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:

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

Cursor

Add to ~/.cursor/mcp.json:

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

VS Code

Add to .vscode/mcp.json:

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 this recipe and give me grams: 1 1/2 cups flour, 1/2 cup sugar, 2 tbsp honey, 1 stick butter."
  • "Scale this recipe from 4 servings to 10."
  • "What is gas mark 6 in Fahrenheit, and what should I set a fan oven to?"

How it converts

  • Density in g per mL = grams per US cup / 236.5882365.
  • Volume to weight = amount x unit mL x density. Weight to volume is the reverse.
  • Volume to volume and weight to weight use the unit constants only.
  • A stick of butter is 1/4 lb (113.398 g), which USDA lists as 113 g and 1/2 cup.
  • Gas marks follow the standard recipe table (gas mark 4 = 350 F = 180 C). Fan ovens are set 20 C lower, per oven maker guidance.

27 test fixtures check unit constants and table values. The expected values come from scripts/expected.py, which works from the unit definitions and the published table values, not from the server code.

Data sources

See DATA_SOURCES.md. In short, densities come from USDA FoodData Central SR Legacy portion weights (FDC ids per row) and the King Arthur Baking ingredient weight chart, both fetched on 2026-10-30. The table is rebuilt by scripts/build_data.py.

Limitations

  • Volume measures vary with how you fill the cup. Dry values assume spoon-and-level filling. Scooping flour from the bag can add 30 g or more per cup. Weigh when it matters.
  • Table values are whole grams per cup, so results carry about plus or minus 0.5 g per cup of rounding. King Arthur rows given per tablespoon or teaspoon are coarser.
  • Whole eggs and other count items are not converted by volume. A large egg is about 50 g.
  • Ingredient matching is fuzzy. Check the matched name in the result, or use search_ingredients first.
  • Fan oven guidance is a rule of thumb. Oven calibration varies.

Development

npm installnpm run buildnpm testnpx wrangler deploy

src/core.ts holds the pure conversion logic and src/data.ts the generated density table. src/stdio.ts and src/worker.ts are thin entries over the same tool registry in src/tools.ts.

License

MIT

Part of the Zovo MCP collection: https://mcp.zovo.one

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Source: README.md at commit 0ed154d

Tools

4

convert_ingredient

Convert cups to grams for a named ingredient

Converts a kitchen amount between volume and weight for a specific ingredient, using measured grams-per-cup values (USDA FoodData Central portion weights with FDC ids, and the King Arthur Baking ingredient weight chart) instead of guessed densities. 271 ingredients. Units: US cup (236.5882365 mL), metric cup (250 mL), imperial cup, US legal cup (240 mL), Japanese cup, US/metric/Australian tablespoons, teaspoons, US and imperial fl oz, pints, quarts, gallons, mL, dL, L, g, mg, kg, oz, lb and sticks of butter. Volume to volume and weight to weight need no ingredient. States which cup definition it used and cites the density source.

Parametersamountrequiredto_unitrequiredfrom_unitrequiredcup_systemingredient

search_ingredients

Search the measured ingredient density table

Fuzzy search over the ingredient table (flours, sugars, fats, dairy, liquids, nuts, grains, fruit, produce). Returns canonical names, grams per US cup and per tablespoon, and the source (USDA FDC id or King Arthur Baking chart). Use it to pick the exact ingredient before converting.

Parameterslimitqueryrequired

scale_recipe

Scale a recipe and convert it to grams

Scales a list of recipe ingredient lines ("1 1/2 cups all-purpose flour", "2 tbsp honey", "3 eggs") by a factor or from original to target servings. Parses mixed numbers and fraction characters. With to_metric_weights, converts cup and spoon amounts to grams with the measured density table and weights to grams, and reports lines it could not match.

Parameterslinesrequiredfactorcup_systemtarget_servingsoriginal_servingsto_metric_weights

convert_oven_temperature

Convert oven temperature between F, C and gas mark

Converts an oven setting between Fahrenheit, Celsius and UK gas mark (1/4 to 10, from the standard recipe table) and optionally adjusts for a fan (convection) oven by 20 C, the manufacturer guidance. Returns the nearest gas mark and whether it is an exact table value.

Parametersfanvaluerequiredfrom_scalerequired

Version history

1
  1. v1.0.0LatestOct 30, 2026

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