How do I use CalcsLive MCP Server?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@CalcsLive MCP Server calculate the torque for a 2 HP motor running at 100 rpm" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

CalcsLive MCP Server

Enable AI agents to perform unit-aware engineering calculations via Model Context Protocol (MCP)

Transform AI assistants like Claude into powerful engineering calculation tools with automatic unit conversion, dependency resolution, and professional-grade accuracy.

🎯 What is This?

The CalcsLive MCP Server connects AI agents to CalcsLive's calculation engine via the Model Context Protocol (MCP). This enables AI to:

✅ Perform complex engineering calculations with proper unit handling
✅ Automatically convert between unit systems (metric ↔ imperial)
✅ Resolve multi-step calculation dependencies
✅ Access 75+ unit categories with 500+ units
✅ Validate calculations with engineering accuracy

Example

User: "Calculate hydro power for a flow rate of 150 m³/s with a head of 25 meters"

AI (via CalcsLive MCP):

{ "power": { "value": 36787.5, "unit": "kW" } }

AI automatically handles the unit-aware calculation: P = ρ × g × H × Q × η

📋 Prerequisites

Node.js 18+ installed on your system
CalcsLive Account - Sign up at calcs.live
MCP API Key - Create from your Account > API Keys
- Select "MCP Integration (AI Agents)" as service type
- Free users: Get 30-day trial (starts on first API call)
- Premium users: Full unlimited access

🚀 Quick Start

1. Install Dependencies

cd /path/to/calcslive-mcp-server npm install

2. Build the Server

npm run build

3. Configure Claude Desktop

Edit your Claude Desktop configuration file:

Location:

Windows: %APPDATA%\Claude\claude_desktop_config.json
macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Linux: ~/.config/Claude/claude_desktop_config.json

Add CalcsLive MCP server:

{ "mcpServers": { "calcslive": { "command": "node", "args": [ "/absolute/path/to/calcslive-mcp-server/dist/index.js" ], "env": { "CALCSLIVE_API_KEY": "your-mcp-api-key-here", "CALCSLIVE_API_URL": "https://www.calcs.live" } } } }

Important:

Replace /absolute/path/to/calcslive-mcp-server with your actual installation path
Replace your-mcp-api-key-here with your actual MCP API key from CalcsLive

4. Restart Claude Desktop

Quit and restart Claude Desktop to load the MCP server.

5. Verify Installation

In Claude Desktop, you should see the CalcsLive tools available. Try asking:

"What CalcsLive tools do you have available?"

Claude should list calcslive_run_script, calcslive_calculate, and calcslive_validate.

🔧 Claude Code (VS Code Extension) Setup

If you're using Claude Code in VS Code, use the Claude CLI for easier configuration:

1. Install and Build

cd /path/to/calcslive-mcp-server npm install npm run build

2. Add MCP Server via Claude CLI

Use the claude mcp add command with stdio transport:

Linux/macOS:

claude mcp add --scope user --transport stdio calcslive node \ --env CALCSLIVE_API_KEY=your-mcp-api-key-here \ --env CALCSLIVE_API_URL=https://www.calcs.live \ -- /absolute/path/to/calcslive-mcp-server/dist/index.js

Windows PowerShell:

claude mcp add --scope user --transport stdio calcslive node ` --env CALCSLIVE_API_KEY=your-mcp-api-key-here ` --env CALCSLIVE_API_URL=https://www.calcs.live ` -- C:\absolute\path\to\calcslive-mcp-server\dist\index.js

Important Notes:

--scope user: Makes MCP available in all VS Code windows (recommended for global access)
- Without --scope user, MCP only works in the current project directory
- Alternative scopes: local (project-specific), project (shared in team)
Command structure: calcslive node where node is the command and path comes after --
Replace /absolute/path/to/calcslive-mcp-server (or C:\absolute\path\to\... on Windows) with your actual installation path
Replace your-mcp-api-key-here with your actual API key from CalcsLive API Keys
For local development, use CALCSLIVE_API_URL=http://localhost:3000

3. Verify in VS Code

Restart your VS Code window or reload Claude Code extension. The CalcsLive MCP tools should now be available to Claude Code AI.

Test it:

"Calculate the torque for a 2 HP motor running at 100 rpm"

Claude Code should use the calcslive_run_script tool to perform the calculation.

Alternative: Manual Configuration

If Claude CLI is not available, you can manually edit the Claude Code MCP configuration file, but the CLI method is strongly recommended for reliability.

🛠️ Available Tools

`calcslive_run_script` ⭐ NEW

Run stateless unit-aware calculations from Physical Quantity (PQ) script definitions. No article creation needed - fully stateless and on-the-fly.

Example Usage:

User: "Calculate the area of a circle with radius 5 cm in mm²" AI uses: calcslive_run_script - pqs: [ { sym: "r", description: "radius", value: 5, unit: "cm" }, { sym: "A", description: "circle area", expression: "pi * r^2", unit: "cm²" } ] - outputs: { A: { unit: "mm²" } }

Response:

Calculation completed with 1 output Results: • circle area (A): 7853.982 mm² = pi * r^2 Detailed calculation: { "inputs": { "r": { "value": 5, "unit": "cm", "baseValue": 0.05, "baseUnit": "m" } }, "outputs": { "A": { "value": 7853.982, "unit": "mm²", "baseValue": 0.007854, "baseUnit": "m²" } } }

Key Features:

✅ No article creation required (stateless)
✅ Define calculations on-the-fly with PQ JSON
✅ Supports Greek letters (α, β, η, ρ, etc.)
✅ Automatic dependency resolution
✅ Unit conversion for inputs and outputs
✅ Mathematical expressions with MathJS

`calcslive_calculate`

Perform unit-aware calculations using existing CalcsLive articles.

Example Usage:

User: "Calculate the kinetic energy of a 1500 kg car traveling at 25 m/s" AI uses: calcslive_calculate - articleId: "kinetic-energy" - inputs: { mass: { value: 1500, unit: "kg" }, velocity: { value: 25, unit: "m/s" } } - outputs: { energy: { unit: "kJ" } }

Response:

{ "energy": { "value": 468.75, "unit": "kJ", "expression": "0.5 * mass * velocity^2" } }

`calcslive_validate`

Discover available inputs/outputs for a calculation article.

Example Usage:

User: "What parameters does the hydro power calculation accept?" AI uses: calcslive_validate - articleId: "hydro-power"

Response:

{ "articleTitle": "Hydro Power Calculation", "inputPQs": [ { "symbol": "Q", "description": "Flow rate", "unit": "m³/s", "categoryId": "volumetric_flow_rate" }, { "symbol": "H", "description": "Head", "unit": "m", "categoryId": "length" } ], "outputPQs": [ { "symbol": "P", "description": "Power output", "unit": "kW", "expression": "rho * g * H * Q * eta" } ] }

💡 Usage Examples

Example 1: Unit Conversion

User: "Convert 65 mph to km/h"

AI: Uses CalcsLive to create a simple calculation:

Input: velocity = 65 mph Output: velocity in km/h = 104.6 km/h

Example 2: Multi-Step Engineering Calculation

User: "Calculate pump power needed for 100 gallons per minute at 50 psi with 85% efficiency"

AI:

Validates pump calculation article
Converts units (gpm → m³/s, psi → Pa)
Performs calculation with dependencies
Returns power in kW

Example 3: Complex Physics Problem

User: "A projectile is launched at 45° with initial velocity 30 m/s. What's the maximum height?"

AI:

Uses projectile motion calculation article
Inputs: angle = 45°, velocity = 30 m/s
Calculates: max_height = (v² × sin²θ) / (2g) = 22.96 m

🔧 Development

Build & Watch

npm run dev

This runs TypeScript in watch mode for development.

Testing Locally

Run the server directly to test:

export CALCSLIVE_API_KEY=your_key_here npm start

You should see:

CalcsLive MCP server running on stdio API Base: https://www.calcs.live Ready to perform unit-aware calculations for AI agents!

📊 API Rate Limits

User Tier	Rate Limit	Trial Period
Free	60 calls/min	30 days
Premium	60 calls/min	N/A (unlimited)
Enterprise	Unlimited	N/A

Note: Trial starts automatically on first API call. Upgrade to Premium before trial expires for continued access.

🐛 Troubleshooting

"API key not found or inactive"

Solution: Check your API key in Account > API Keys

Ensure service type is "MCP Integration (AI Agents)"
Verify key is active (not expired)
Copy key exactly (no extra spaces)

"Article not found"

Solution:

Ensure article is set to Public access level
Use the article's Short ID, not UUID
Verify you own the article (can't access others' articles via API)

"Trial has expired"

Solution: Upgrade to Premium to restore MCP access

Claude Desktop Not Finding Tools

Solution:

Check config file syntax (valid JSON)
Verify path to dist/index.js is correct
Ensure npm run build completed successfully
Restart Claude Desktop completely
Check Claude Desktop logs for errors

"Unknown unit" Error

Solution:

CalcsLive supports both superscript (m³) and caret (m^3) notation
Use caret notation if typing: m^3 instead of m³
Check Units Reference for valid units

🌟 Advanced Usage

Custom API Base URL (Development)

For local development or custom deployments:

{ "mcpServers": { "calcslive": { "env": { "CALCSLIVE_API_URL": "http://localhost:3000", "CALCSLIVE_API_KEY": "your-dev-key" } } } }

Multiple API Keys

You can configure separate MCP servers for different projects:

{ "mcpServers": { "calcslive-project-a": { "command": "node", "args": ["..."], "env": { "CALCSLIVE_API_KEY": "project-a-key" } }, "calcslive-project-b": { "command": "node", "args": ["..."], "env": { "CALCSLIVE_API_KEY": "project-b-key" } } } }

📚 Resources

CalcsLive Platform: calcs.live
MCP Documentation: modelcontextprotocol.io
Units Reference: calcs.live/help/units-reference
API Integration Guide: calcs.live/help/api-integration
Create Calculations: calcs.live/editor/new

🤝 Support

Documentation: calcs.live/help
Community: GitHub Discussions
Premium Support: Available for Premium/Enterprise subscribers

📝 License

MIT License - See LICENSE file for details

🚀 What's Next?

Create Custom Calculations: Build your own calculation articles at calcs.live/editor/new
Explore Unit Categories: Browse 75+ categories at Units Reference
Upgrade for More: Premium plans unlock unlimited calculations
Share & Collaborate: Make calculations public for others to use via MCP

Built with ❤️ for AI-powered engineering

CalcsLive MCP Server

🎯 What is This?

Example

📋 Prerequisites

🚀 Quick Start

1. Install Dependencies

2. Build the Server

3. Configure Claude Desktop

4. Restart Claude Desktop

5. Verify Installation

🔧 Claude Code (VS Code Extension) Setup

1. Install and Build

2. Add MCP Server via Claude CLI

3. Verify in VS Code

Alternative: Manual Configuration

🛠️ Available Tools

calcslive_run_script ⭐ NEW

calcslive_calculate

calcslive_validate

💡 Usage Examples

Example 1: Unit Conversion

Example 2: Multi-Step Engineering Calculation

Example 3: Complex Physics Problem

🔧 Development

Build & Watch

Testing Locally

📊 API Rate Limits

🐛 Troubleshooting

"API key not found or inactive"

"Article not found"

"Trial has expired"

Claude Desktop Not Finding Tools

"Unknown unit" Error

🌟 Advanced Usage

Custom API Base URL (Development)

Multiple API Keys

📚 Resources

🤝 Support

📝 License

🚀 What's Next?

Resources

Tools

New MCP Servers

Latest Blog Posts

MCP directory API

`calcslive_run_script` ⭐ NEW

`calcslive_calculate`

`calcslive_validate`