Home Affordability Calculator: How Much House Can You Afford?
This housing affordability calculator estimates the highest home price a buyer could carry by limiting the total monthly housing payment and total monthly debt to chosen percentages of gross monthly income, then showing which limit binds. It is a planning estimate for United States buyers, not a loan approval.
How to use this page
Each numbered task below points to the section that covers it.
1. home affordability calculator. Start in the form: income, monthly debts, down payment, rate, term, tax, insurance, PMI and HOA.
2. housing affordability calculator. Set the front-end and back-end ratio limits that cap the housing payment.
3. how much can I afford for a house. Read the maximum home price estimate and which of the two limits binds.
7. how much home can I afford. Compare the debt and down payment tables to see how the price moves.
8. how much can I afford for a house calculator. Check the worked examples against the expected results.
10. mortgage calculator affordability. Use the FAQ for answers on payments, ratios and lender approval.
13. calculate mortgage affordability. Follow the method section for the ratio math and the price formula.
Calculate mortgage affordability
Enter household income, monthly debts and the loan terms you expect. Money fields are in US dollars (USD). Tax and insurance vary by location and stay editable so you can match a real listing or quote.
Maximum home price estimate
Maximum home price (estimate, up to)
$0
Which limit binds: —
- Gross monthly income
- $0.00
- Housing limit A (front-end)
- $0.00
- Housing limit B (back-end after debts)
- $0.00
- Maximum housing payment H
- $0.00
- Loan amount
- $0
- Down payment
- $0
- Monthly principal and interest
- $0.00
- Monthly property tax
- $0.00
- Monthly insurance
- $0.00
- Monthly PMI
- $0.00
- Monthly HOA
- $0.00
- Total monthly housing payment
- $0.00
- Resulting front-end DTI
- —
- Resulting back-end DTI
- —
Money is shown to cents (half up). The maximum price is rounded down to the nearest dollar for the phrase “up to”.
Which limit binds: front-end vs back-end
Affordability is capped by the smaller housing limit. Change debts or the ratio defaults and the binding side can switch.
Front-end limit (A)
Housing payment ÷ gross monthly income ≤ 28%
Limit A = $0.00
—
Back-end limit (B)
(Housing + debts) ÷ gross monthly income ≤ 36%
Limit B = $0.00
—
Sensitivity table: what would change this maximum price?
Hypothetical scenarios recalculated from your current inputs. Values are estimates with the same limitations as the main result.
| Scenario | What changes | Max price | vs base |
|---|---|---|---|
| Base | Your current inputs | $0 | — |
| Rate −0.5 pt | Interest rate minus 0.5 percentage points | $0 | — |
| Rate +0.5 pt | Interest rate plus 0.5 percentage points | $0 | — |
| Down payment +10 pt | 10 percentage points more down | $0 | — |
| Car payment paid off | Monthly debts reduced by the largest $200 slice capped at 40% of debts | $0 | — |
Comparison tables: how debts and down payment move the number
How each monthly debt amount reduces the back-end limit
Back-end housing limit B = back-end ratio × gross monthly income − monthly debts. Higher debts shrink B dollar for dollar.
| Monthly debts | Limit B | Limit A (unchanged) | Binding limit | Max price |
|---|
Price range at different down payment percentages
With a percent down payment, a larger share down shrinks the loan and can raise the price the same housing payment supports.
| Down payment % | Max price | Loan amount | Monthly P&I |
|---|
How the home affordability calculator works
The method turns two income ratios into a housing payment ceiling, then solves for the home price whose payment equals that ceiling.
- Gross monthly income G = annual income ÷ 12.
- Front-end housing limit A = front-end ratio × G.
- Back-end housing limit B = back-end ratio × G − monthly debts.
- Maximum housing payment H = max(0, min(A, B)).
- Payment factor per dollar borrowed f = r ÷ (1 − (1 + r)−n), with monthly rate r and n monthly payments; when the rate is 0, f = 1 ÷ n.
- Price solve (percent down d, tax rate t, annual insurance I, monthly PMI p, monthly HOA h): price = (H − I/12 − p − h) ÷ (f × (1 − d) + t/12).
- Price solve (fixed down amount D): price = (H − I/12 − p − h + f × D) ÷ (f + t/12), with loan = max(0, price − D).
Your numbers in the formula
Enter values and calculate to see the substituted formula.
28 percent front-end and 36 percent back-end are a widely used rule of thumb documented here as a calculator convention. They are not a federal, state or lender legal limit. Actual underwriting uses credit, assets, reserves, loan program rules and lender overlays.
Worked examples (hypothetical inputs)
Labeled hypothetical examples use 20 percent down, 6.5 percent rate, 30-year term, property tax 1.1 percent of price per year, insurance $1,500 per year, PMI $0 and HOA $0, with ratio defaults 28 and 36 percent.
| Case | Income | Monthly debts | Binding | Max price (up to) |
|---|---|---|---|---|
| F1 | $100,000 | $500 | Front-end binds (H = $2,333.33) | $369,706 |
| F2 | $100,000 | $1,500 | Back-end binds (H = $1,500.00) | $230,194 |
| F3 | $100,000 | $0 | Front-end binds | $369,706 |
| F4 | $40,000 | $1,300 | Back-end negative; H floored at $0 | $0 |
| F5 | $0 | any | No income; H = $0 | $0 |
These fixtures test arithmetic only. They are not tax advice, program rules or market quotes.
What affordable means here: estimate vs lender decision
Affordable in this tool means the payment fits the ratio ceilings you set. A lender still decides whether to approve a loan.
✓ Represented in this estimate
- Gross income and chosen ratio limits
- Monthly debts you enter
- Principal, interest, tax, insurance, PMI, HOA
- Which ratio binds and sensitivity to rate and down payment
✗ Not represented
- Credit score, assets and cash reserves
- FHA, VA, USDA or conventional program rules
- Closing costs, moving costs and seller concessions
- Lender overlays, self-employment income rules, rental income
Common mistakes when buyers estimate a price range
- Using take-home pay instead of gross income in the ratio math.
- Leaving out HOA, PMI or high property taxes that are common in the target area.
- Treating the 28/36 numbers as a guarantee of approval.
- Forgetting that a lower rate or larger down payment changes the affordable price.
- Ignoring closing costs and cash reserves when planning the search range.
Home affordability calculator FAQ
How much can I afford for a house?
A common starting point is the 28/36 rule of thumb: keep the total monthly housing payment near 28 percent of gross monthly income and total monthly debt payments near 36 percent. The lower of the two limits usually binds. This is a calculator convention, not a lender decision.
How much mortgage can I afford?
Mortgage size follows from the housing payment limit after subtracting property tax, insurance, PMI and HOA, then dividing by the monthly loan payment factor. Higher rates, taxes or HOA reduce the loan and price you can carry.
What does the front-end and back-end ratio mean?
The front-end ratio compares the housing payment to gross monthly income. The back-end ratio compares housing payment plus other monthly debts to gross monthly income. Defaults of 28 and 36 percent are a widely used rule of thumb, not a legal limit.
Is this a lender approval?
No. Actual approval depends on credit, assets, reserves, loan program, documentation and lender overlays. A preapproval and Loan Estimate from a licensed lender control the real decision.
How much home can I afford with more debt?
Other monthly debts reduce the back-end housing limit dollar for dollar. When back-end limit B falls below front-end limit A, that side binds and the maximum price drops accordingly.
Is the 28/36 rule a legal limit?
No. It is a widely used rule of thumb used here as a calculator convention. Program rules and individual lender standards differ and change over time; check current guidance from the relevant agency and your lender before relying on any number.
Does this tool check loan programs like FHA or VA?
No. Program-specific ratios, mortgage insurance premiums and eligibility are outside the current scope of this page and are marked as not represented.
Glossary
- Gross monthly income
- Household earnings before taxes and deductions, divided by 12.
- Debt-to-income ratio (DTI)
- Housing payment plus other debts as a share of gross monthly income.
- Front-end ratio
- Housing payment only, divided by gross monthly income.
- Back-end ratio
- Housing payment plus other monthly debts, divided by gross monthly income.
- PMI
- Private mortgage insurance, often required when down payment is under 20 percent; amount is user-entered here.
- HOA
- Homeowners association dues billed monthly in many condos and planned communities.
- Payment factor f
- Monthly principal and interest per dollar borrowed for a given rate and term.
Related calculators
For a full monthly payment schedule with taxes, insurance and PMI, use the Mortgage Calculator with Taxes, Insurance and PMI. For take-home pay when planning the income side of the budget, see the Paycheck Calculator. For loan payment context on existing balances, see the Personal Loan Calculator.
Official references and starting points
These agency pages are listed as official starting points for readers who want primary material on mortgage rules. Every regulated number on this page stays an editable input with a default.
- Consumer Financial Protection Bureau (CFPB) consumer mortgage resources — consumerfinance.gov/consumer-tools/mortgages/ (reference starting point)
- CFPB / Regulation Z, 12 CFR 1026.43 (Ability-to-Repay and Qualified Mortgage) — ecfr.gov/title-12/part-1026 (reference starting point)
- HUD — hud.gov (reference starting point if an FHA preset is ever built)
- FHFA — fhfa.gov (reference starting point for conforming loan limits)
Corrections: use the site feedback channel on varnda.com when published; no special email is invented here.
Limitations, exclusions and assumptions
- All results are estimate with limitations. The tool never reports approval or qualification.
- 28/36 defaults are calculator conventions, not law or a specific lender program.
- Tax rate, insurance, PMI and HOA are user-entered estimates and are local; they are not market averages.
- Not represented: credit, assets, reserves, FHA/VA/USDA rules, closing costs, concessions, variable rates, rental or self-employment income averaging.
- If income is empty, the status is more information required. If back-end limit B is negative, H floors at 0 and no positive price is shown.
Summary
Use this home affordability calculator to set a search price range from income, debts, down payment and costs you can control. Adjust the ratio limits and cost inputs to match a real quote, compare scenarios in the sensitivity table, then confirm any decision with a licensed lender’s preapproval and Loan Estimate. Byline: Varnda Editorial Team.
