Use this debt-to-income (DTI) ratio calculator to turn your income and monthly debt payments into a percent, like many lenders do. You can also see a housing-only (front-end) DTI and how much your debt or income would need to change to hit a target DTI.
Advanced options
How to use this calculator
- Enter your gross income amount (before taxes).
- Choose your income frequency (weekly, biweekly, semimonthly, monthly, or yearly) so it can be converted to a gross monthly income.
- Enter your monthly housing payment (PITI). If you rent, put your rent here. If you own, include principal and interest, property taxes, homeowners insurance, and mortgage insurance (if any).
- Enter your monthly HOA dues (or 0 if none).
- Enter your other required monthly debt payments total (credit card minimums, auto loans, student loans, personal loans, child support, alimony, etc.). Do not include groceries, utilities, phone, or gas.
- Optional: Add other steady gross monthly income (or leave it at 0).
- Optional: Turn on front-end DTI to see housing-only DTI.
- Optional: Enter a target back-end DTI percent to see the max debt allowed and how far you are from that target.
- Click Calculate.
Methodology
What DTI means
Debt-to-income ratio (DTI) is a monthly snapshot: total required monthly debt payments divided by gross monthly income (income before taxes), shown as a percent. Lenders commonly use DTI to understand how much of your income is already committed to debt payments. This calculator follows the standard approach described in lending guidance and consumer explanations. [1] [2]
Step 1: Convert income to gross monthly income
First, the calculator converts your income to a monthly gross income and then adds any optional other gross monthly income:
gross monthly income (used) = (income amount x frequency to monthly multiplier) + other gross monthly income
Multipliers used: Weekly = 52/12, Biweekly = 26/12, Semimonthly = 2, Monthly = 1, Yearly = 1/12. These conversions are estimates because real pay schedules can vary slightly by employer. [2]
Step 2: Build the monthly housing cost
monthly housing cost (used) = monthly housing payment (PITI or rent) + HOA dues
PITI is a common way to describe the total monthly housing payment for owners: principal, interest, taxes, and insurance (and sometimes mortgage insurance). [2]
Step 3: Total monthly debt payments (back-end numerator)
total monthly debt payments (used) = monthly housing cost + other monthly debt payments
Other monthly debt payments should be required payments (minimums), not extra payments you choose to make. Common examples include credit card minimums, car loans, student loans, and support payments. Everyday living costs like food and utilities are not counted as debt payments in DTI. [1] [2]
Step 4: Calculate DTI percentages
back-end DTI (total) = (total monthly debt payments / gross monthly income) x 100
If you choose to show it, front-end DTI (housing only) = (monthly housing cost / gross monthly income) x 100. Front-end DTI uses only housing costs, while back-end DTI uses housing plus all other debts. [2]
Target DTI helper (planning math)
If you enter a target back-end DTI percent greater than 0 and up to 100, the calculator also shows:
max total monthly debt allowed at target DTI = gross monthly income x (target DTI percent / 100)
monthly debt reduction needed = max(0, current total monthly debt - max allowed)
gross monthly income increase needed = max(0, (current total monthly debt / (target DTI percent / 100)) - current gross monthly income)
These are simple planning estimates. Real underwriting can treat some income and debts differently. [1]
Validation and edge cases
If gross monthly income (after conversion) is 0 or less, the calculator stops and asks you to enter a higher income. Negative dollar amounts are not allowed. If a target DTI is entered, it must be greater than 0 and not more than 100. When income is very close to zero, DTI can become extremely large, so the calculator may show a warning that the result may be misleading.
Definitions
Gross monthly income: Your monthly income before taxes and other deductions.
Minimum payment: The required monthly amount you must pay on a debt (for example, the credit card minimum).
PITI: Principal, Interest, Taxes, and Insurance in a monthly housing payment (for renters, this tool uses rent in the same input).
Front-end DTI: Housing-only DTI: housing cost divided by gross monthly income.
Back-end DTI: Total DTI: housing plus other required monthly debts divided by gross monthly income.