# Fraction Calculator — MCP tool `findutils:fraction_calculator`

Add, subtract, multiply or divide two fractions, or simplify one. Accepts whole numbers (3), simple fractions (3/4), mixed numbers (2 1/2) and decimals (0.75). Returns the reduced fraction, the mixed-number form, the decimal value, and the steps. Exact integer arithmetic — no floating-point drift.

- 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/fraction-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/fraction-calculator/
- Same tool on the other surface: https://findutils.com/api/fraction-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": "fraction_calculator",
      "arguments": {
        "a": "1/3",
        "b": "1/6",
        "operation": "add"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `a` | string | yes | First value: 3, 3/4, 2 1/2, or 0.75. |
| `b` | string | no | Second value, same formats. Omit it to simply reduce the first value. |
| `operation` | string (add \| subtract \| multiply \| divide) | no | What to do with the two values. Ignored when b is omitted. Default: `"add"`. |

Example arguments (verified):

```json
{
  "a": "1/3",
  "b": "1/6",
  "operation": "add"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/fraction-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "a": "1/3",
    "b": "1/6",
    "operation": "add"
  }'

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

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