How to Use the Unit & FX Calculator MCP in Claude

Q: Can I batch convert units with Unit & FX Calculator and Claude Desktop?

Absolutely. The batchconvert tool lets you pass multiple values along with their source and target units for a single, deterministic conversion pass.

Keep your math right. Unit & FX Calculator for Claude Desktop.

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Connect Unit & FX Calculator MCP to Claude Desktop

Create your Vinkius account to connect Unit & FX Calculator to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Unit & FX Calculator with Claude Desktop

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Convert Units and Currency Rates in the Local Chat

Use `convert_unit` to deterministically change physical units, like converting celsius to fahrenheit or km/h to mph. This tool uses mathjs for accurate results. You can also use `batch_convert` when you need to convert multiple units at once in a single pass. It's perfect for quick data checks without leaving the chat.

Get Live Exchange Rates via MCP Server

Need currency rates? The `get_rate` tool pulls the exact foreign exchange rate between two currencies using the Frankfurter API, with a one-hour cache. This means you get live financial data straight into your conversation. It prevents Claude Desktop from hallucinating or mixing up currency values. Just tell your agent what pair of currencies you need.

Process Multiple Units in One Go

The `batch_convert` tool handles converting several different physical units simultaneously. You pass the value, source unit, and target unit for each item, getting a clean list of conversions. This deterministic process is way more reliable than relying on general knowledge models. It keeps your calculations tight when you're working with complex data sets.

Setup guide

Set up Unit & FX Calculator MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Unit & FX Calculator MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Unit & FX Calculator MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under unit-fx-calculator-mcp.

json

{
  "mcpServers": {
    "unit-fx-calculator-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Math.js & Frankfurter. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Unit & FX Calculator MCP in Claude Desktop

You access it through local tool calls in the Desktop app. It provides deterministic conversions for physical units and real-time currency rates, stopping any mixing of metric and imperial measurements.

It handles standard physical units (like length or temperature) using `convert_unit`, as well as currency pairs for rates. The tool is built to handle numerical values accurately.

Yes, you add the MCP Server under the mcpServers key in your config file if using the local stdio transport. Alternatively, if it's remote, you paste the HTTPS URL into Settings → Integrations.

Absolutely. The `batch_convert` tool lets you pass multiple values along with their source and target units for a single, deterministic conversion pass.

This server primarily touches numerical values (the physical unit value) and currency codes (e.g., USD, EUR). It doesn't handle personal identifying information.

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