---
title: "Rent Affordability Calculator"
method: POST
path: "/api/v1/tools/rent-affordability-calculator"
tags: ["home"]
---

# Rent Affordability Calculator

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

## Request

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

Find out how much rent you can afford using the 30% rule, 50/30/20 budget, and a cashflow stress test. All three caps side by side so you see the trade-offs.

## Request body

- object
  - `grossMonthlyIncome` number, required
  - `takeHomePay` number, required
  - `monthlyFixedExpenses` number, required
  - `dtiPct` 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)