Calculator
Home Affordability Calculator
How much house can I carry — and which limit binds first?
About you
The loan
Comfortable to stretching
—
at the ceiling that is —
What is holding you back
—
- Underwriting maximum
- —
- Loan at that price
- —
- Monthly housing budget
- —
- Estimated payment
- —
Where your gross income goes
How the price moves with the rate
Everything else held still. A point of rate is worth roughly a tenth of the price.
Share this result
Thank you — that is where it would go.
This is a demonstration site, so no email was sent and your address was not stored. To actually send it now, useyour own mail app.
The link carries your inputs in the address, so whoever opens it sees the same numbers. Sharing uses plain share links: no social SDKs, no tracking pixels, and nothing leaves your browser until you click one.
Illustrative figures — here is exactly what this assumes
- Gross income before tax; monthly debts are minimum payments.
- Back-end DTI: housing plus all other debts against gross income.
- Housing cost includes principal, interest, tax and insurance.
- Property tax entered as a yearly percentage of the price.
- No mortgage insurance, HOA dues or student-loan deferral rules modelled.
- Figures are illustrative and are not a pre-approval or a commitment to lend.
This calculator provides estimates for educational purposes only. Results are not a Loan Estimate, pre-approval, or commitment to lend, and may not reflect taxes, insurance, HOA dues, or other costs. Contact a loan officer for an accurate quote.
Rates shown are for illustrative purposes only, are not a quote or guarantee, and do not reflect a specific offer. Actual rates depend on credit score, loan amount, loan-to-value, occupancy, and other factors, and change daily. Contact us for a personalized rate quote.
Turn the estimate into a number
A calculator uses averages. A loan officer uses your file.
Property taxes, insurance and mortgage insurance all move by county, by carrier and by credit profile. If you want a figure you can plan around, that is the conversation to have.
- No credit pull to start a conversation
- Plain answers, including "this is not the right time"
- You can stop at any point
This is a demonstration website. The form below validates and confirms, but nothing is sent and nothing is stored. Nobody will call you.
Thank you, there.
On a live site this would reach a loan officer and you would hear back the same working day. On this demonstration nothing was sent, nothing was stored, and nobody will contact you.
If you want to reach a real person about this demo, the site owner is at hello@summitcrestmortgage.com.
Keep going
- Monthly PaymentPrincipal, interest, tax, insurance, HOA and PMI — itemised.
- Amortisation ScheduleEvery payment, month by month or year by year, with running totals.
- Refinance & Break-evenNew rate against closing costs, and the month it pays back.
- Extra PaymentsOne-off and recurring overpayments against interest and months saved.
- Rent vs BuyBoth paths over a holding period, with every assumption exposed.
Calculator FAQ
Questions about affordability
What is DTI, and why does it decide everything?
Debt-to-income is your total monthly debt payments divided by your gross monthly income. Underwriting uses it as the main affordability test because it is the one number that captures whether the new payment fits alongside everything you already owe. Most conventional programs work to a back-end DTI around 43%, though some go higher with compensating factors.
Which limit is actually binding on me?
This page tells you. Sometimes the DTI ceiling is what caps the price; sometimes it is the cash you have for the deposit. The panel names whichever one bites first, because the fix is different: more deposit does not help if DTI is the constraint, and a higher income does not help if you are short of the deposit.
Should I actually borrow the maximum?
Usually not. The maximum is what an underwriter would permit, not what leaves room for a boiler, a car or a pay gap. A reasonable habit is to run the number, then work at eighty to ninety percent of it and see whether the payment still looks comfortable in the payment calculator.
Does the calculator include property tax and insurance?
Yes. Both are inside the housing budget, which is why the affordable price is lower than a payment-only calculation would suggest. It solves iteratively, because the tax bill depends on the price you can afford, which depends on the tax bill.