Debt-to-Income Ratio Calculator
Calculate your DTI ratio — a key factor lenders use in mortgage approval.
Debt-to-Income Ratio Calculator
Calculate your DTI ratio — a key factor lenders use in mortgage approval.
Debt Payoff Formula
ℹ️ Total interest = (PMT × n) – P. Your payment must exceed the monthly interest charge.
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
Pay off the highest interest rate debt first (avalanche method) to minimise total interest paid mathematically. But the snowball method (lowest balance first) works better psychologically for many people.
If your payment doesn't exceed the monthly interest charge, your balance grows forever. Run this calculator first to ensure your payment is sufficient before committing.
Balance transfer cards with 0% introductory APR can save hundreds if you can pay off the balance within the promotional period — but read the fine print on fees and reversion rates.
An extra $100/month toward a $10,000 credit card at 19.9% APR reduces payoff time from 10+ years to under 5 years and saves over $6,000 in interest.
When to Use This Calculator
See exactly how long it takes to pay off credit card debt at your current payment — motivation to pay more.
Calculate payoff timelines for multiple debts to prioritise by interest rate and minimise total interest.
See how much time and money an extra $50–200/month saves to motivate accelerated payoff.
Compare payoff at current rate vs 0% promotional rate to decide if a balance transfer makes financial sense.
Calculate how long minimum payments take — and how much interest you'll pay — on any debt balance.
About the Debt-to-Income Ratio Calculator
This debt-to-income (DTI) ratio calculator computes your front-end and back-end DTI ratios — the key metrics lenders use to evaluate loan applications for mortgages, auto loans, and other credit. Enter your gross monthly income and all monthly debt payments to see your DTI ratios and how they compare to lender qualification thresholds. Built for borrowers preparing a loan application or checking their borrowing capacity.
How to Use the Debt-to-Income Ratio Calculator
- 1
Enter your gross monthly income (before taxes — include all income sources).
- 2
Enter all monthly debt payments: mortgage/rent, car loan, student loans, credit cards (minimum payments), personal loans.
- 3
See your front-end DTI (housing-only) and back-end DTI (all debts) ratios.
- 4
Compare to typical lender thresholds: 28% front-end, 36–43% back-end.
- 5
Adjust debts or income to see what changes would improve your DTI.
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