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Home Buying Budget Calculator

Affordability Calculator

Estimate how much house you can afford based on income, debts, down payment, interest rate, property taxes, and insurance. This free affordability calculator helps you compare home prices against a target monthly housing budget.

Enter affordability details

Use your income, debts, and loan terms to estimate a comfortable home price.

Annual household income

Monthly debt payments

Down payment

Down payment type

Interest rate (%)

Loan term

Property tax rate (% yearly)

Home insurance (% yearly)

Housing ratio (%) Portion of gross income allocated to housing costs.

Total debt ratio (%) Housing plus debt payments as a share of gross income.

Estimated Affordable Home Price

Estimated maximum home price based on your selected budget ratios.

Estimated Loan Amount

Target Monthly Housing Budget

Front-End Ratio

Back-End Ratio

Affordability breakdown

Gross monthly income $0

Monthly debt payments $0

Monthly housing budget $0

Estimated monthly principal & interest $0

Estimated tax + insurance $0

Estimated total monthly housing cost $0

Home price composition

Down payment

Loan amount

How this affordability calculator works

This calculator estimates a home price based on the share of your gross income that can reasonably go toward housing, while also taking your other monthly debt obligations into account.

It uses two common budgeting guidelines: a front-end ratio for housing costs alone and a back-end ratio for total debt obligations. The lower of those two limits becomes the estimated monthly housing budget.

What does this calculator show?

Affordable home price: Estimated home price based on your chosen ratios
Loan amount: Estimated mortgage balance after down payment
Housing budget: Monthly amount available for principal, interest, taxes, and insurance
Debt ratios: Percentage of gross income used for housing and total debt

Common uses

Estimate a realistic home buying budget
See how debts affect affordability
Compare larger and smaller down payments
Test different interest rates and loan terms

Affordability formulas

The calculator uses these core formulas:

Gross Monthly Income = Annual Income ÷ 12 Front-End Housing Budget = Gross Monthly Income × Housing Ratio Back-End Housing Budget = (Gross Monthly Income × Total Debt Ratio) − Monthly Debt Payments Monthly Housing Budget = lower of Front-End Budget and Back-End Budget Loan Amount = Home Price − Down Payment Total Monthly Housing Cost = Principal & Interest + Property Tax + Home Insurance

Example

If household income is $85,000, monthly debts are $600, and you use 28% and 36% budgeting ratios, the calculator estimates a monthly housing budget and works backward to estimate an affordable home price.

Affordability Calculator FAQ

What is a front-end ratio?

The front-end ratio is the share of gross monthly income that goes toward housing expenses only, such as mortgage principal, interest, property taxes, and insurance.

What is a back-end ratio?

The back-end ratio includes housing costs plus other recurring debt payments like car loans, student loans, and credit card minimum payments.

Why does down payment affect affordability?

A larger down payment reduces the loan amount, which lowers monthly principal and interest and may increase the home price you can afford.

Does this calculator include PMI or HOA?

No. This version focuses on principal, interest, property tax, and insurance. If you expect PMI or HOA dues, reduce the housing ratio or target budget accordingly.

Is this an approval estimate?

No. This is a planning tool. Actual lender approval depends on credit score, reserves, income documentation, debts, and other underwriting factors.