---
title: "FIRE Calculator: When Can You Retire Early?"
method: POST
path: "/api/v1/tools/fire-calculator"
tags: ["savings"]
---

# FIRE Calculator: When Can You Retire Early?

`POST /api/v1/tools/fire-calculator`

## Request

- Base URL: `https://calcfleet.com`
- URL: `https://calcfleet.com/api/v1/tools/fire-calculator`
- Auth: none declared

Calculate your FIRE number and years to early retirement. Enter current savings, annual expenses, and expected return rate to reach financial independence.

## Request body

- object
  - `currentAge` integer, required
  - `currentSavings` number, required
  - `annualExpenses` number, required
  - `annualSavings` number, required
  - `expectedReturnPct` number, required
  - `withdrawalRatePct` number, required

## Response `200`

Successful calculation result.

- object
  - `result` object, required: Structured calculation output (fields vary per calculator).

## Other responses

- `400`: Invalid input — the issues array contains Zod validation errors.
- `403`: Forbidden — an Authorization: Bearer cf_… key was supplied but is invalid.
- `404`: Unknown tool slug.

---

[API](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api.md) · [All operations](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/revisions/cd9abd595bbe?raw)