Toolkit Shelf

Money Calculators

Mortgage Affordability Calculator

Use this mortgage affordability calculator to turn income, debt, rate, and down payment assumptions into an estimated home price range.

Reviewed May 25, 2026EstimateFormula shown

Quick answer

Mortgage Affordability Calculator: what it calculates

Mortgage Affordability Calculator calculates affordable home price from annual income, monthly debts and down payment. The core method is Max housing payment = lower of income x housing limit or income x total debt limit minus debts.

ResultAffordable home price
InputsAnnual income, Monthly debts, Down payment, Interest rate
FormulaMortgage affordability formula

Live calculator

Mortgage affordability

Estimated affordable home price$298,977

Loan amount plus down payment using the entered payment limits.

Estimated loan amount$238,977

$1,550.00 available for principal and interest.

Max monthly housing payment$2,200.00

Lower of the housing-limit and total-debt-limit methods.

Affordability constraints

This shows which limit controls the estimate.

ConstraintMonthly amount
Monthly gross income$7,916.67
Housing limit$2,216.67
Total debt limit after debts$2,200.00
Taxes, insurance, HOA$650.00
Principal and interest$1,550.00

Formula

Mortgage affordability formula

Max housing payment = lower of income x housing limit or income x total debt limit minus debts

The calculator subtracts estimated taxes, insurance, and HOA before estimating a loan amount from the remaining principal-and-interest budget.

How to use

Steps

  1. Enter annual household income and existing monthly debts.
  2. Enter down payment, interest rate, loan term, and estimated monthly ownership costs.
  3. Adjust the housing and total debt limits if you use a different planning rule.
  4. Compare the estimated home price with local taxes, insurance, and lender quotes.

Example

Sample calculation

Annual income$95,000
Monthly debts$650
Estimated affordable priceAbout $360k

Calculator use

Best for

  • Quick affordable home price from annual income, monthly debts and down payment.
  • Personal finance scenarios before changing a budget, loan, savings goal, or purchase plan.
  • Monthly cash flow, affordability, debt payoff, or future-value estimates.
  • Assumption checks before talking with a lender, tax preparer, employer, or financial professional.

Before relying on it

Check first

  • Entering annual income, monthly debts and down payment from different time periods or scenarios.
  • Mixing gross income, take-home income, one-time costs, and monthly costs in the same comparison.
  • Forgetting taxes, fees, insurance, irregular bills, or minimum payments when using an estimate.
  • Treating a planning estimate as a quote, tax filing result, approval decision, or guaranteed return.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.

28% housingCommon planning rule

Keeps housing costs near 28% of gross monthly income.

36% total debtConservative DTI check

Includes housing plus recurring debt payments.

Local costsCan move the result

Taxes, insurance, HOA, and rates can change the affordable price quickly.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Max housing payment = lower of income x housing limit or income x total debt limit minus debts

Inputs used

Annual income, Monthly debts, Down payment, Interest rate

Limitations

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. Mortgage Affordability Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/mortgage-affordability-calculator

FAQ

Common questions

How much house can I afford?

A rough estimate starts with income, existing debts, down payment, interest rate, loan term, and monthly taxes, insurance, and HOA costs.

Does this replace mortgage preapproval?

No. This is a planning estimate. Lenders use credit, income documentation, loan program rules, assets, debts, and property details.

Why do taxes and insurance matter?

They are part of the monthly housing payment, so higher taxes or insurance leave less room for principal and interest.