Math-MCP
Enable your LLMs to perform accurate numerical calculations with a simple API.
What it can do
- Add: Adds two numbers together
- Subtract: Subtracts the second number from the first number
- Multiply: Multiplies two numbers together
What data it sees
Do you need an account
No: the server works without sign-in
Enable your LLMs to perform accurate numerical calculations with a simple API. Leverage basic arithmetic and statistical functions to enhance your applications. Simplify complex mathematical tasks effortlessly and improve your model's capabilities.
How to connect
How to connect Math-MCP to Claude
The server address to paste into Claude settings:
https://math-mcp--ethanhenrickson.run.tools
- Open Claude (claude.ai or the desktop app).
- Go to Settings → Connectors.
- Click Add custom connector.
- Paste the server address copied below into Remote MCP server URL and click Add.
- In a chat, click + → Connectors and switch the new connector on.
Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.
Authorization
After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.
How to connect Math-MCP to ChatGPT
The server address to paste into ChatGPT settings:
https://math-mcp--ethanhenrickson.run.tools
- Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
- Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
- Open Settings → Connectors and click Create.
- Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
- Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
- In a new chat open + → Apps/Connectors and enable the connector.
OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.
Authorization
On first use ChatGPT opens the service's sign-in window. Sign in and approve access.
How to connect Math-MCP to Cursor
The server address to paste into Cursor settings:
https://math-mcp--ethanhenrickson.run.tools
Fastest: click Open in Cursor below and confirm the prompt.
Manually:
- In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
- Paste the JSON copied below into
~/.cursor/mcp.json(per project:.cursor/mcp.jsonin the repo root). - Save the file. The server appears in the MCP list; authorize it there if asked.
Authorization
If the service needs sign-in, an authorize button appears next to the server in the MCP list.
Server tool list (22)
Raw names from tools/list. Only developers need these.
| add | Adds two numbers together |
| subtract | Subtracts the second number from the first number |
| multiply | Multiplies two numbers together |
| division | Divides the first number by the second number |
| sum | Adds any number of numbers together |
| modulo | Divides two numbers and returns the remainder |
| mean | Calculates the arithmetic mean of a list of numbers |
| median | Calculates the median of a list of numbers |
| mode | Finds the most common number in a list of numbers |
| min | Finds the minimum value from a list of numbers |
| max | Finds the maximum value from a list of numbers |
| floor | Rounds a number down to the nearest integer |
| ceiling | Rounds a number up to the nearest integer |
| round | Rounds a number to the nearest integer |
| sin | Calculates the sine of a number in radians |
| arcsin | Calculates the arcsine of a number in radians |
| cos | Calculates the cosine of a number in radians |
| arccos | Calculates the arccosine of a number in radians |
| tan | Calculates the tangent of a number in radians |
| arctan | Calculates the arctangent of a number in radians |
| radiansToDegrees | Converts a radian value to its equivalent in degrees |
| degreesToRadians | Converts a degree value to its equivalent in radians |