Is the Fitness Tools MCP server free to use?

Yes. Fitness Tools is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Is the Fitness Tools MCP server free to use?

Yes. Fitness Tools is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Fitness Tools

Deterministic fitness calculators — TDEE, adaptive TDEE, body fat, 1RM, macros — with consensus.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Install Config Generator

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claude_desktop_config.json

{
  "mcpServers": {
    "fitness-tools": {
      "command": "npx",
      "args": [
        "-y",
        "fitness-tools"
      ]
    }
  }
}

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

Documentation Overview

Fitness Tools

📖 Documentation · npm

Use it with your AI right now: add the hosted MCP connector https://fitness-tools-mcp.ajwallacemusic.workers.dev/mcp in claude.ai / ChatGPT settings, install one-click in Cursor or VS Code, or grab the Claude Desktop .mcpb.

Composable, deterministic fitness calculators — BMR/TDEE, body fat, 1RM, macros, activity multiplier, powerlifting attempts, and natural muscular potential. Each calculator runs several published formulas and reports a consensus across them.

This repo ships three separate, independently-usable artifacts:

@almostjacked/fitness-tools — the npm library. Validated, self-describing calculators that run natively in the browser and on the server. This is the product.
@almostjacked/fitness-tools-api — a reference HTTP server built on the library. It re-exposes the same calculators over HTTP (identical math, identical results) and is inert until you run or host it.
@almostjacked/fitness-tools-mcp — an MCP stdio server built on the library. It exposes the same calculators as MCP tools for agents/LLM clients (identical math), runnable with npx @almostjacked/fitness-tools-mcp.

Which one do you want?

You're…	Use	Why
Writing JS/TS (browser, Node, edge)	`@almostjacked/fitness-tools` (npm)	Runs in-process. Install, import, call. No server, no network.
Calling from another language / `curl` / a no-code tool	`@almostjacked/fitness-tools-api` (HTTP)	Same calculators over HTTP. You run/host it.
Building a remote frontend	`@almostjacked/fitness-tools-api`	Self-describing catalog + OpenAPI over the wire.
Wiring the calculators into an MCP client / agent	`@almostjacked/fitness-tools-mcp`	`npx` an MCP stdio server; one tool per calculator.

The API adds a network boundary, not capability. The package works the moment you install it; the server does nothing until it's running.

Documentation

New to it? Getting started
What each calculator does: Tools
Calling from an agent: Consumer guide
Working on this repo: AGENTS.md

Layout

Code

packages/core   @almostjacked/fitness-tools — the library (the product)
apps/api        @almostjacked/fitness-tools-api  — a reference HTTP server over the library
apps/mcp        @almostjacked/fitness-tools-mcp  — an MCP stdio server over the library

Develop

bash

corepack enable              # pnpm version is pinned in package.json
pnpm install
pnpm -r test                 # core + api + mcp test suites
pnpm -C packages/core build  # build the library
pnpm -C apps/api dev         # run the reference server on :8080

See each package's README — library · reference server.

License

MIT — free, open-source, and usable in commercial products. See LICENSE. Built on published formulas (Mifflin-St Jeor, US Navy, Jackson-Pollock, Epley, Casey Butt, etc.); contributions welcome.

Related MCP Servers

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Frequently Asked Questions about Fitness Tools

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "fitness-tools": { "command": "npx", "args": ["-y", "Fitness Tools"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

0/4 checks healthy over the last 6h

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Fitness Tools →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

Fitness Tools

📖 Documentation · npm

This repo ships three separate, independently-usable artifacts:

@almostjacked/fitness-tools — the npm library. Validated, self-describing calculators that run natively in the browser and on the server. This is the product.
@almostjacked/fitness-tools-api — a reference HTTP server built on the library. It re-exposes the same calculators over HTTP (identical math, identical results) and is inert until you run or host it.
@almostjacked/fitness-tools-mcp — an MCP stdio server built on the library. It exposes the same calculators as MCP tools for agents/LLM clients (identical math), runnable with npx @almostjacked/fitness-tools-mcp.

Which one do you want?

You're…	Use	Why
Writing JS/TS (browser, Node, edge)	`@almostjacked/fitness-tools` (npm)	Runs in-process. Install, import, call. No server, no network.
Calling from another language / `curl` / a no-code tool	`@almostjacked/fitness-tools-api` (HTTP)	Same calculators over HTTP. You run/host it.
Building a remote frontend	`@almostjacked/fitness-tools-api`	Self-describing catalog + OpenAPI over the wire.
Wiring the calculators into an MCP client / agent	`@almostjacked/fitness-tools-mcp`	`npx` an MCP stdio server; one tool per calculator.

The API adds a network boundary, not capability. The package works the moment you install it; the server does nothing until it's running.

Documentation

New to it? Getting started
What each calculator does: Tools
Calling from an agent: Consumer guide
Working on this repo: AGENTS.md

Layout

Code

packages/core   @almostjacked/fitness-tools — the library (the product)
apps/api        @almostjacked/fitness-tools-api  — a reference HTTP server over the library
apps/mcp        @almostjacked/fitness-tools-mcp  — an MCP stdio server over the library

Develop

bash

corepack enable              # pnpm version is pinned in package.json
pnpm install
pnpm -r test                 # core + api + mcp test suites
pnpm -C packages/core build  # build the library
pnpm -C apps/api dev         # run the reference server on :8080

See each package's README — library · reference server.

License

MIT — free, open-source, and usable in commercial products. See LICENSE. Built on published formulas (Mifflin-St Jeor, US Navy, Jackson-Pollock, Epley, Casey Butt, etc.); contributions welcome.