---
title: "Car Affordability Calculator"
method: POST
path: "/api/v1/tools/car-affordability-calculator"
tags: ["auto"]
---

# Car Affordability Calculator

`POST /api/v1/tools/car-affordability-calculator`

## Request

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

How much car can you afford? Enter your monthly budget, APR, loan term, and down payment to see your max loan and car price, plus a 15%-of-income rule check.

## Request body

- object
  - `monthlyPayment` number, required
  - `annualRatePct` number, required
  - `termMonths` integer, required
  - `downPayment` number, required
  - `tradeIn` number, required
  - `monthlyIncome` number

## 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)