Mortgage Affordability Calculator

Formula

Income×DTI − debt; then invert amortization formula

Worked example

6,000 income, 500 debt, 36% DTI, 6%, 30y — about 276,868

Quick answer

What does the Mortgage Affordability Calculator do?

Estimate a maximum monthly housing payment and approximate mortgage principal from income, debt ratio and rate.

What is the Mortgage Affordability Calculator?

Estimate a maximum monthly housing payment and approximate mortgage principal from income, debt ratio and rate. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula Income×DTI − debt; then invert amortization formula. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

6,000 income, 500 debt, 36% DTI, 6%, 30y about 276,868

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.