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Real Estate · Affordability

Home Affordability
(28/36)

Lenders size a mortgage against two ratios. The front-end ratio caps your housing payment at a share of gross monthly income, and the back-end ratio caps housing plus every other debt payment. This calculator runs both, takes the smaller answer, and works backwards from that payment to the loan and purchase price it supports. The interest rate is yours to enter, since nothing here connects to the network.

Data: 2026, ratios are lender convention, not statute; interest rate is user-supplied

Income & Debt STEP 1
Before tax, all borrowers combined
Minimum required payments only
Lenders count this as debt
Cash & Loan Terms STEP 2
Comes out of the same cash
Not fetched. Enter your quoted rate.
This rate is not fetched from anywhere. It is a starting figure you should replace with the rate you were actually quoted. Nothing on this page touches the network.
Housing Costs & Ratios STEP 3
Applies when the down payment is under 20%
The classic 28. Conventional underwriting often allows more.
The classic 36. Many programs allow 43 or higher.
Constants Panel EDITABLE
HUD guideline, low confidence, verify current
HUD guideline, low confidence, verify current
Homeowners Protection Act
Bisection iterations are fixed at 60 for reproducibility and are not user-editable, per the Apex implementation constant.
Maximum Purchase Price
--
Binding ratio: --
Total Monthly Housing Payment
--
Principal, interest, tax, insurance, HOA, MI
Price At Rate +1 / +2 Points
--
The input you control least
Ratios
Gross monthly income--
Total other monthly debt--
Front-end allowance--
Back-end allowance--
Binding ratio--
The Purchase It Supports
Maximum purchase price--
Loan amount at that price--
Down payment--
Down payment percentage--
Monthly principal and interest--
Monthly property tax--
Monthly insurance--
Monthly HOA--
Monthly mortgage insurance--
Total monthly housing payment--
Front-end ratio achieved--
Back-end ratio achieved--
Cash & Rate Sensitivity
Cash required at close--
Cash surplus or shortfall--
Maximum price at rate + 1 point--
Reduction at + 1 point--
Maximum price at rate + 2 points--
Reduction at + 2 points--
Binding constraint--
A lender's underwriting will differ from this estimate. Debt-to-income ratios, credit history, reserves, and program guidelines all factor into a real approval.
Policy Mandate v2.0 · what is this?