# Scientific Calculator — MCP tool `findutils:scientific_calculator`

Evaluate a scientific math expression and return the numeric result (12 significant digits). Supports + - * / ^ (or **), parentheses, n!, π (or pi), e, and the functions sin, cos, tan, asin, acos, atan, log (base 10), ln, sqrt (or √), abs, exp. Trigonometry in radians or degrees. Uses a safe parser — no code execution.

- 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/scientific-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/scientific-calculator/
- Same tool on the other surface: https://findutils.com/api/scientific-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": "scientific_calculator",
      "arguments": {
        "expression": "sin(30) + 2^3",
        "angle_unit": "deg"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `expression` | string | yes | Expression to evaluate, e.g. "sin(30) + 2^3 * (4 - 1)" or "5! / sqrt(16)". |
| `angle_unit` | string (rad \| deg) | no | Angle unit for sin/cos/tan inputs and asin/acos/atan outputs. Default: `"rad"`. |

Example arguments (verified):

```json
{
  "expression": "sin(30) + 2^3",
  "angle_unit": "deg"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/scientific-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "expression": "sin(30) + 2^3",
    "angle_unit": "deg"
  }'

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

Full REST reference: https://findutils.com/api/scientific-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