# Investment Calculator — MCP tool `findutils:investment_calculator`

Return the projected value of an investment with compound growth and monthly contributions: final balance, total contributions, total interest, an effective yearly growth rate, and a year-by-year table. Return is a yearly percentage; contributions are added at the start or the end of each month.

- Category: finance
- 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/investment-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/investment-calculator/
- Same tool on the other surface: https://findutils.com/api/investment-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": "investment_calculator",
      "arguments": {
        "initial_investment": 10000,
        "monthly_contribution": 500,
        "annual_return": 7,
        "years": 20,
        "compound_frequency": "monthly",
        "contribution_timing": "end"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `initial_investment` | number | no | Starting amount. Default: 0. |
| `monthly_contribution` | number | no | Amount added every month. Default: 0. |
| `annual_return` | number | yes | Expected yearly return in percent (7 = 7%). |
| `years` | integer | yes | Investment length in years. |
| `compound_frequency` | string (annually \| semiannually \| quarterly \| monthly \| daily) | no | How often returns compound. Default: monthly. |
| `contribution_timing` | string (beginning \| end) | no | Add the contribution at the beginning or the end of each month. Default: end. |

Example arguments (verified):

```json
{
  "initial_investment": 10000,
  "monthly_contribution": 500,
  "annual_return": 7,
  "years": 20,
  "compound_frequency": "monthly",
  "contribution_timing": "end"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/investment-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "initial_investment": 10000,
    "monthly_contribution": 500,
    "annual_return": 7,
    "years": 20,
    "compound_frequency": "monthly",
    "contribution_timing": "end"
  }'

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

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