Housing · Free online calculator
Home Affordability Calculator
Explore a rough housing budget from income, existing debts and a target payment ratio.
CALCULATOR GUIDE
How the Home Affordability Calculator works
Explore a rough housing budget from income, existing debts and a target payment ratio. This guide explains the inputs, calculation method, example and key limitations so you can check whether the result fits your question.
Explore a rough housing budget from income, existing debts and a target payment ratio.
Estimated monthly housing budget = gross monthly income × the selected maximum total debt-to-income ratio − existing monthly debt payments. The estimate is then converted to an approximate loan amount and adjusted for the down-payment percentage.
Inputs to prepare
Before you calculate, gather the values the question asks for and check their units. Choose options carefully and use consistent dates, periods and starting values. The notes below describe the fields shown in the calculator above.
- Gross monthly household incomeUse a numeric value and keep the displayed unit consistent. Allowed range: 0.01 to 1000000000
- Monthly debt paymentsUse a numeric value and keep the displayed unit consistent. Allowed range: 0 to 1000000000
- Annual mortgage rate (%)Use a numeric value and keep the displayed unit consistent. Allowed range: 0 to 100
- Mortgage term (years)Use a numeric value and keep the displayed unit consistent. Allowed range: 1 to 50
- Down payment (%)Use a numeric value and keep the displayed unit consistent. Allowed range: 0 to 99
- Maximum total debt-to-income ratio (%)Use a numeric value and keep the displayed unit consistent. Allowed range: 1 to 100
How to use the Home Affordability Calculator
- Enter the details. Fill in each required field and use the units or formats shown next to it.
- Check your assumptions. Confirm dates, comparison values, time periods and selected options before submitting.
- Calculate and review. Read the result together with its unit, time period and any additional breakdown.
- Compare scenarios. Change one input at a time if you want to understand how different values affect the outcome.
Formula and worked example
Estimated monthly housing budget = gross monthly income × the selected maximum total debt-to-income ratio − existing monthly debt payments. The estimate is then converted to an approximate loan amount and adjusted for the down-payment percentage.
Example calculation
If gross monthly income is 8,000, existing monthly debt payments are 600, and the total debt-to-income limit is 28%, the approximate housing-payment budget is 1,640 per month before property-specific costs.
Try the same values in the calculator above. If your result differs, recheck the units, input order, assumptions and rounding displayed by the tool.
What your result means
Explore a rough housing budget from income, existing debts and a target payment ratio. Read the result label and unit carefully. A useful estimate describes only the inputs and assumptions supplied; it should not be treated as proof of a future outcome or a guarantee.
- Check the displayed unit and period before comparing results.
- Use values from a reliable source and keep them up to date.
- Repeat the calculation with an independent check when the outcome matters.
Assumptions and limitations
Lenders use broader underwriting criteria; this is not a pre-approval.
The calculator is a general-purpose tool. Actual outcomes may depend on local rules, provider terms, measurement standards or personal circumstances not represented in the fields. For consequential financial, health, legal, tax or construction decisions, confirm the result with an appropriate authoritative or qualified source.
Frequently asked questions
How does the home affordability calculator work?
Estimated monthly housing budget = gross monthly income × the selected maximum total debt-to-income ratio − existing monthly debt payments. The estimate is then converted to an approximate loan amount and adjusted for the down-payment percentage.
Can I rely on the result as an exact answer?
Lenders use broader underwriting criteria; this is not a pre-approval.
How can I get a more useful estimate?
Use accurate inputs, keep units consistent, check the assumptions on this page and compare the output with an authoritative source when the result affects a financial, health, construction or legal decision.
For transparency, use the formula and worked example to check the output. Add authoritative references and have the calculation reviewed before relying on it for a consequential decision.