A debt-to-income (DTI) calculator shows what share of your gross monthly income already goes to debt payments. Enter your total monthly debt and your gross monthly income, and it returns your DTI ratio as a percentage along with the income left over.
Lenders lean on DTI when deciding whether to approve a mortgage or loan. A ratio of 36% or below is widely seen as healthy, many programs stretch to 43%, and higher ratios make approval harder. Lowering debt or raising income both nudge the ratio in your favour.