# Statistics Calculator — MCP tool `findutils:statistics_calculator`

Descriptive statistics for a list of numbers: count, sum, mean, median, mode, min, max, range, variance, standard deviation, and the quartiles with the interquartile range. Accepts numbers separated by commas, spaces, semicolons or newlines. Sample or population standard deviation.

- Category: calculators
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/statistics-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/statistics-calculator/
- Same tool on the other surface: https://findutils.com/api/statistics-calculator/

## Connect

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Claude Desktop (`claude_desktop_config.json`):

```json
{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}
```

## Call the tool (verified example)

```bash
curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "statistics_calculator",
      "arguments": {
        "numbers": "2, 4, 4, 4, 5, 5, 7, 9"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `numbers` | string | yes | The numbers, separated by commas, spaces, semicolons or newlines. An array of numbers is also accepted. |
| `deviation` | string (sample \| population) | no | "sample" divides by n-1 (the default, for a sample of a larger group); "population" divides by n. Default: `"sample"`. |

Example arguments (verified):

```json
{
  "numbers": "2, 4, 4, 4, 5, 5, 7, 9"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/statistics-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "numbers": "2, 4, 4, 4, 5, 5, 7, 9"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/statistics-calculator
```

Full REST reference: https://findutils.com/api/statistics-calculator/ · OpenAPI 3.1 spec: https://findutils.com/api/openapi.json

---
Full catalog: POST https://mcp.findutils.com/ with method `tools/list` · https://findutils.com/mcp/ · https://findutils.com/llms.txt