How Much House Can I Afford?

How Much House Can I Afford?

  • Enter your annual income, monthly debt, interest rate, and loan term.
  • Click "Calculate" to find out how much house you can afford.
  • View the affordability chart and summary table for different loan terms.
  • Click "Clear Results" to reset the inputs and results.
  • For a detailed calculation and explanation, click "Calculate" first and then "Show Details."
Affordability Chart
Loan Term Summary
Loan Term (years)Affordable House Price
Detailed Calculation and Explanation


The tool “How Much House Can I Afford?” is a valuable resource for individuals looking to purchase a home. It helps them determine the maximum amount of house they can afford based on their financial situation. This tool is essential in making informed decisions when it comes to buying a home, as it prevents individuals from overextending themselves financially.

The Concept

The concept behind “How Much House Can I Afford?” revolves around assessing an individual’s financial health and determining the amount they can comfortably allocate to housing expenses. To accomplish this, the tool takes into account various financial factors and uses specific formulas to arrive at a maximum affordable home price.

Formulae Used

Several formulae are used in this tool to calculate the maximum affordable home price. These formulae are based on fundamental financial principles and affordability guidelines:

Debt-to-Income Ratio (DTI)

One of the key formulae utilized in this tool is the Debt-to-Income Ratio (DTI). The DTI is calculated as follows:

DTI = (Total Monthly Debt Payments / Gross Monthly Income) * 100

The tool uses a recommended DTI ratio of 28% for housing expenses, which includes mortgage payments, property taxes, and insurance. This means that your total housing expenses should not exceed 28% of your gross monthly income.

Loan-to-Value Ratio (LTV)

The Loan-to-Value Ratio (LTV) is another crucial formula used to determine the maximum affordable home price. It is calculated as:

LTV = (Loan Amount / Appraised Property Value) * 100

Lenders have specific LTV requirements, with a common maximum LTV ratio being 80%. This means that you should aim for a down payment of at least 20% of the property’s value to avoid Private Mortgage Insurance (PMI) costs.

Monthly Mortgage Payment Calculation

To determine the maximum monthly mortgage payment you can afford, the tool employs the following formula:

Maximum Monthly Mortgage Payment = (Gross Monthly Income * DTI Percentage) – Monthly Debt Obligations

This calculation takes into account your gross monthly income, DTI percentage, and existing monthly debt obligations.

Example Calculations

Let’s consider an example to illustrate how the tool works. Suppose an individual has a gross monthly income of $5,000 and monthly debt obligations of $1,000. Using the recommended DTI ratio of 28%, the calculation would be as follows:

Maximum Monthly Mortgage Payment = ($5,000 * 28%) – $1,000 = $1,400 – $1,000 = $400

With a maximum monthly mortgage payment of $400, the tool can then determine the maximum affordable home price based on current interest rates and loan terms.

Real-World Use Cases

The “How Much House Can I Afford?” tool is highly practical and can be applied in various real-world scenarios:

Homebuying Preparation

Prospective homebuyers can use this tool to assess their financial readiness to purchase a home. By inputting their income, debt obligations, and other relevant financial information, they can determine a reasonable price range for their future home.

Mortgage Pre-Approval

Lenders use similar affordability calculations to pre-approve borrowers for mortgages. Borrowers can use the tool to estimate their maximum affordable home price before seeking pre-approval, giving them a better understanding of their financial position.


Even for individuals not currently in the market for a home, this tool can be valuable for budgeting purposes. It helps individuals establish long-term financial goals and allocate their income efficiently.


The “How Much House Can I Afford?” tool is a powerful resource that empowers individuals to make informed decisions when it comes to purchasing a home.

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