Return the FIRE number (annual expenses / withdrawal rate), years to reach it, FIRE age, progress percent, monthly investment, and a year-by-year net worth projection for Traditional, Lean, Fat, Coast, or Barista FIRE. Growth uses the real return (expected return minus inflation); rates are yearly percentages.
This page documents the MCP tool findutils:fire_calculator. See the REST reference →
Call it over MCP
Tool name findutils:fire_calculator
· no API keys · 120 requests/min per IP
Claude Code
claude mcp add findutils --transport http https://mcp.findutils.com/Claude Desktop — claude_desktop_config.json
{
"mcpServers": {
"findutils": {
"url": "https://mcp.findutils.com/"
}
}
}Raw JSON-RPC (any MCP client) — verified example
curl -X POST https://mcp.findutils.com/ \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "fire_calculator",
"arguments": {
"current_age": 30,
"current_net_worth": 50000,
"annual_expenses": 50000,
"annual_income": 80000,
"savings_rate": 30,
"expected_return": 7,
"withdrawal_rate": 4,
"inflation_rate": 2.5,
"fire_type": "traditional"
}
}
}'Input schema
| Argument | Type | Required | Description |
|---|---|---|---|
| current_age | integer | yes | Current age in years. |
| current_net_worth | number | no | Invested net worth today. Default: 0. |
| annual_expenses | number | yes | Yearly spending. Must be > 0. |
| annual_income | number | no | Yearly income. Default: 0. |
| savings_rate | number | no | Percent of income saved. Default: 0. |
| expected_return | number | no | Expected yearly return in percent. Default: 7. |
| withdrawal_rate | number | no | Safe withdrawal rate in percent. Must be > 0. Default: 4. |
| inflation_rate | number | no | Yearly inflation in percent. Default: 2.5. |
| fire_type | string (traditional | lean | fat | coast | barista) | no | FIRE variant. Default: traditional. |
Example arguments (verified)
{
"current_age": 30,
"current_net_worth": 50000,
"annual_expenses": 50000,
"annual_income": 80000,
"savings_rate": 30,
"expected_return": 7,
"withdrawal_rate": 4,
"inflation_rate": 2.5,
"fire_type": "traditional"
}Also a REST endpoint
The same tool answers plain HTTP at
POST /api/tools/fire-calculator/execute — no key, 60 requests/min.
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