Home Affordability Calculator

What is the Home Affordability Calculator?

Before you start browsing Zillow, it helps to know what you can actually afford — not what a mortgage broker says you qualify for, but what makes sense for your budget. Those are often different numbers. The Home Affordability Calculator takes your income, existing debts, down payment, and the current interest rate to tell you the maximum home price you can realistically buy without overextending yourself. It uses standard lending thresholds (like the 28/36 rule) to give you a honest ceiling. First-time buyers, upgrading homeowners, and anyone relocating to a new city use it to set a realistic search range.

How Does It Work?

The calculator applies two debt-to-income thresholds that most conventional lenders use when evaluating mortgage applications.

Front-End Ratio: Monthly Housing Costs ≤ 28% of Gross Monthly Income

Back-End Ratio: Total Monthly Debts ≤ 36% of Gross Monthly Income

Gross Monthly Income is your pre-tax monthly earnings. Monthly Housing Costs include mortgage principal and interest, property taxes, and homeowner's insurance. Total Monthly Debts adds your existing debt payments to the housing costs. The calculator returns the maximum home price consistent with both limits.

How to Use CalciHub's Home Affordability Calculator

1. Enter your gross annual income (or monthly income).

2. Add your monthly debt payments, car loan, student loans, credit cards.

3. Enter your available down payment amount.

4. Input the current mortgage interest rate and loan term.

5. Add estimated monthly property tax and insurance for your target area.

6. Tip: Lenders may approve you for more than this calculator suggests. That doesn't mean you should borrow the maximum. A payment you can afford comfortably beats a bigger house that stresses your budget every month.

A Quick Example

Mike and Emma have a combined gross income of $130,000/year ($10,833/month). They have existing debt payments of $650/month (student loans and a car payment). They've saved $55,000 for a down payment and are looking at a 6.75% rate on a 30-year fixed mortgage.

Front-end limit: 28% × $10,833 = $3,033/month for housing costs.

Back-end limit: 36% × $10,833 − $650 debts = $3,050/month available for housing.

With $55,000 down and a $3,033 max payment, the calculator puts their affordable home price at around $415,000. That's their practical ceiling — not necessarily their search ceiling.

Frequently Asked Questions