Due Date MCP MCP server

An MCP server that estimates due dates using LMP, conception, or ultrasound data, applying ACOG redating rules. It exposes the same calculation engine as the web interface via Streamable HTTP, requiring no authentication and supporting free usage with rate limits.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Gumball Tools

MCP endpoint (Streamable HTTP)

https://due-date.gumballtools.com/api/mcp

Vendor documentation

What you can do with it

Estimate due date from last menstrual period
Calculate due date using ultrasound measurements
Apply ACOG redating rules to pregnancy dates

Tools advertised by the last live check:

due_date

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http due-date-mcp https://due-date.gumballtools.com/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add due-date-mcp --url https://due-date.gumballtools.com/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable due-date-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "due-date-mcp": {
      "url": "https://due-date.gumballtools.com/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "due-date-mcp": {
      "type": "streamableHttp",
      "url": "https://due-date.gumballtools.com/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start due-date-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "due-date-mcp": {
      "type": "http",
      "url": "https://due-date.gumballtools.com/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http due-date-mcp https://due-date.gumballtools.com/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "due-date-mcp": {
      "url": "https://due-date.gumballtools.com/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "due-date-mcp": {
      "serverUrl": "https://due-date.gumballtools.com/api/mcp"
    }
  }
}

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