For informational purposes only. Not financial, investment, or tax advice. Results are estimates based on the inputs provided. Consult a qualified financial professional before making financial decisions.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
How the Estimate Is Built
This calculator uses two planning limits often used in mortgage affordability discussions:
- Front-end ratio: housing payment up to 28% of gross monthly income
- Back-end ratio: total monthly debt up to 36% of gross monthly income
The lower of those two limits controls the maximum monthly payment used for the estimate.
What the Tool Actually Models
The current tool converts that payment limit into a loan amount using principal and interest only. It does not ask for property tax, homeowners insurance, HOA dues, mortgage insurance, or closing costs, so treat the displayed home price as an upper planning screen rather than a full housing-budget result.
Example of the Constraint
| Input | Example |
|---|---|
| Gross annual income | 90,000 |
| Monthly debts | 600 |
| Front-end cap | 2,100/month |
| Back-end cap after debts | 2,100/month |
If debts rise, the back-end limit can become the tighter constraint even when income stays the same.
Affordability Is Not Approval
This tool is for planning. A lender may use different DTI limits, qualifying rates, credit standards, reserves, insurance rules, or product requirements. Your own comfort level may also be lower than the maximum a lender would allow.
Frequently asked questions
What is debt-to-income ratio?
Debt-to-income ratio compares recurring monthly debt payments with gross monthly income. This calculator uses common 28% front-end and 36% back-end planning limits, but lenders and loan programs can use different thresholds.
Why can the affordable price fall when my debts rise?
Because existing monthly debts use part of the total payment capacity allowed under the back-end ratio. The more income already committed to debt, the less remains for a mortgage payment.
Does the estimate include everything I will pay as a homeowner?
No. It includes the inputs available in the tool, but real ownership costs can also include maintenance, repairs, HOA dues, utilities, mortgage insurance, and closing costs.
If the calculator says I can afford a home, am I approved?
No. Approval depends on the lender, loan type, documentation, credit profile, property, reserves, and current underwriting rules. Treat this as a planning screen before getting real quotes.
