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Home Affordability from Income and Expenses Calculator

Maximum mortgage based on 28% front-end DTI ratio.

Estimates the maximum home price based on: monthly income × 28% (PITI limit) → maximum monthly payment → maximum mortgage via annuity formula. Uses 30-year amortisation.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

$
%
yr
$

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Max PITI = 0.28×Income; Max Mortgage = PITI × [(1+r)ⁿ−1] / (r(1+r)ⁿ)

In depth

Estimates the maximum home price based on: monthly income × 28% (PITI limit) → maximum monthly payment → maximum mortgage via annuity formula. Uses 30-year amortisation.