Debt-to-Income Ratio (DTI) Calculator
Calculate your current front-end and back-end debt-to-income ratios.
Income
Monthly Housing Costs
Other Monthly Debts
Target DTI Ratios
How it works: The debt-to-income ratio compares your monthly debt obligations to gross monthly income. Front-end DTI uses housing costs only (PI + taxes + insurance + HOA + PMI), while back-end DTI includes all recurring debts. All calculations run locally in your browser for complete privacy.
Overview
Use ToolYard's Debt-to-Income Ratio Calculator to measure both front-end DTI (housing only) and back-end DTI (all debts). Enter your income, mortgage or rent components (PI, taxes, insurance, HOA, PMI), and other monthly debts such as auto, student loans, and credit cards. You'll get clear percentages, a color-coded status, and a detailed breakdown. Planning ahead? Switch to Required Income to learn the monthly and annual income needed to hit a target ratio, or Max Housing to estimate a sustainable housing budget. A What-If slider lets you stress-test changes in income or debts. All calculations run in your browser for speed and privacy.
About
About Debt-to-Income Ratio Calculator
The debt-to-income ratio compares your monthly debt obligations to gross monthly income. Many planners monitor both a front-end ratio (housing only) and a back-end ratio (housing plus all recurring debts). This calculator separates housing components (PI, property taxes, homeowners insurance, HOA dues, and optional PMI) from other debts (auto, student, credit cards, personal loans, child support/alimony). Results are immediate and transparent, with editable targets so you can tailor the analysis to your situation. Because lender criteria and underwriting rules vary, use these numbers as planning estimates and consult your lender or advisor for specifics.
Features:
- Calculate front-end DTI (housing costs only)
- Calculate back-end DTI (all monthly debts)
- Required Income mode to find minimum earnings for target DTI
- Max Housing mode to determine affordable housing budget
- What-If scenarios to test changes in income or debts
- Editable target percentages (default 28% front / 36% back)
- Color-coded status badges (green/amber/red)
- Detailed breakdown of income, housing, and debts
- Copy summary and CSV export
- 100% client-side calculation for complete privacy
FAQ
What's the difference between front-end and back-end DTI?
Front-end DTI uses housing costs only (principal, interest, taxes, insurance, HOA, PMI) divided by gross monthly income. Back-end DTI includes housing costs plus all other monthly debts (auto, student loans, credit cards, personal loans, support payments) divided by gross monthly income.
Does this use gross or net income?
Calculations use gross monthly income to align with common DTI practices used by lenders and financial planners. Gross income is your total income before taxes and deductions.
Are utilities or groceries included?
No. Only debt obligations and housing items listed are included. Utilities, groceries, and other living expenses are not part of DTI calculations.
Can I enter rent instead of a mortgage?
Yes — place the total monthly rent in the Principal & Interest field and set other housing items (taxes, insurance, HOA, PMI) as needed or leave them at zero.
Are targets fixed?
No — you can edit the target percentages to your preference using the sliders. Common targets are 28% for front-end and 36% for back-end, but these vary by lender and situation.
What DTI ratio do I need for a mortgage?
Most conventional lenders prefer a front-end DTI below 28% and back-end below 36%, though FHA and other programs may allow higher ratios. Check with your specific lender for their requirements.
How do I use the Required Income mode?
Enter your housing costs and other debts, set your target DTI ratios, then switch to Required Income mode and calculate. The tool will show the minimum monthly and annual income needed to meet those targets.
What does binding mean in Max Housing mode?
Binding refers to which DTI target (front-end or back-end) is more restrictive and limits your maximum housing budget. The calculator shows both caps and identifies which one is binding.