Debt-to-Income Ratio Calculator

Debt-to-Income Ratio Calculator computes both ratios lenders look at when deciding whether to approve a mortgage. The front-end ratio counts housing costs only against gross monthly income; the back-end ratio counts every monthly debt obligation. Back-end is the one that usually decides applications, and most borrowers only ever hear about it after being declined. Enter your gross monthly income, housing payment, and each other monthly debt, and the tool returns both ratios, places you in a qualification band from excellent to high risk, shows residual income after debt, and calculates how much borrowing headroom remains before the common 43% ceiling. Because DTI thresholds are broadly consistent across mortgage markets, the guidance works internationally without any country-specific data behind it.

Key Features

• Both Ratios Calculated

  Front-end housing ratio and back-end total-debt ratio, since lenders test both and the tighter one governs.

• Qualification Bands

  Places your back-end ratio in a named band with colour coding, so you know where you stand rather than just seeing a percentage.

• Itemised Debt List

  Add and label each debt separately rather than entering one total, which makes it obvious which obligation is hurting you most.

• Borrowing Headroom

  Shows how much more monthly debt fits before the 43% ceiling, or how far over it you already are.

• Residual Income

  Income left after all debt service — the figure that determines whether a technically approvable ratio is actually livable.

• Country-Neutral Guidance

  Thresholds around 36% and 43% apply broadly across mortgage markets, so no country-specific data is needed.

1. 1

   Enter gross monthly income

   Before tax, since lenders underwrite on gross income. Include reliable bonus or commission income.

2. 2

   Enter your housing payment

   Rent, or mortgage plus property tax, insurance and HOA if you own.

3. 3

   List every other monthly debt

   Car payments, student loans, credit card minimums, personal loans. Label each so the list stays readable.

4. 4

   Read both ratios

   Back-end is the one lenders weight most heavily. Check which band you fall in.

5. 5

   Check your headroom

   See how much room is left before the 43% ceiling, which tells you how much more you could borrow.

Explore these tools that work great alongside Debt-to-Income Ratio Calculator: