How does the calculator combine your debts?
Total debt is the sum of the balances you enter, and total monthly payment is the sum of the payments. The number of debts simply counts the rows with a balance above zero, so you can leave unused rows at zero.
The blended interest rate is a balance-weighted average. Each debt's rate is multiplied by its balance, those products are added, and the sum is divided by total debt. A debt that makes up half of what you owe counts for half of the blended rate, no matter how high or low its own rate is.
Total monthly interest estimates one month of interest across everything: each balance times its annual rate divided by 12, then added together. Installment loans and cards calculate interest a little differently day to day, but this monthly view is close enough to show how much of your payments goes to interest right now.
Total debt = B₁ + B₂ + B₃ + B₄ Blended rate = (B₁ × R₁ + B₂ × R₂ + …) ÷ Total debt Monthly interest = Σ (Bᵢ × Rᵢ ÷ 12)
- Bᵢ
- current balance of debt i
- Rᵢ
- annual interest rate of debt i
- Σ
- sum across all debts entered
Example: four debts added into one view
Scenario: Say you have a credit card at $3,200 and 24.99%, a car loan at $14,600 and 7.4%, a student loan at $21,000 and 5.5%, and a personal loan at $5,500 and 13%, with payments of $110, $389, $228 and $185.
- Total debt$3,200 + $14,600 + $21,000 + $5,500 = $44,300
- Total monthly payment$110 + $389 + $228 + $185 = $912
- Balance × rate for each debt$3,200 × 24.99 = 79,968; $14,600 × 7.4 = 108,040; $21,000 × 5.5 = 115,500; $5,500 × 13 = 71,500; sum = 375,008
- Blended rate375,008 ÷ 44,300 = 8.47%
- Monthly interest$66.64 + $90.03 + $96.25 + $59.58 = $312.50
- Share of payments going to interest$312.50 ÷ $912 = 34.3% this month
You owe $44,300 across four debts, pay $912 a month, carry a blended rate of 8.47%, and about $312.50 of this month's payments goes to interest.
The blended rate hides the spread: the card is under a tenth of the total yet charges nearly 25%, so it is still the most expensive dollar you owe.
When should you add up all your debts?
Starting a payoff plan
You cannot choose between paying the smallest balance or the highest rate first until every debt is listed in one place. This snapshot is the inventory step that comes before any strategy.
Judging a consolidation offer
Compare an offered consolidation rate with both your blended rate and the rates on the specific debts it would replace. A loan priced above your blended rate can still be worthwhile for a few high-rate cards, but not for everything.
Preparing for a loan or mortgage application
Lenders look at your total monthly debt payments relative to income. Knowing that figure ahead of time helps you anticipate how an application might be viewed.
Tracking progress over time
Re-running the totals every few months shows whether your overall balance and monthly interest are actually falling. A shrinking monthly interest figure is a clear sign the plan is working.
What mistakes make a debt total misleading?
Reading the blended rate as a real rate
No lender charges your blended rate. It is a comparison number, and averaging can make a costly card look harmless when it sits beside a large low-rate loan.
Using old balances
Balances change every month. Pull the current figure from each latest statement or online account so the totals and monthly interest reflect where you stand today.
Leaving out smaller debts
A store card, a medical payment plan or money owed on a buy-now-pay-later purchase all count. Small balances are often the ones with the highest rates or the easiest to forget.
Mixing a mortgage into everything
A mortgage can dwarf other balances and pull the blended rate toward its own. Many people find it clearer to list it separately and focus this snapshot on consumer debt.
Confusing payment with interest
A large monthly payment does not mean the debt is shrinking quickly. The monthly interest result shows how much of the payment is absorbed before principal goes down.
Which of your debts is costing the most each month?
The biggest balance is not always the biggest problem. Splitting each debt's monthly interest out from its payment shows which accounts are actually moving and which are mostly treading water.
In the example, the credit card is the smallest balance but over 60% of its payment goes to interest. Remove it from the list and the blended rate on what remains drops from 8.47% to 7.18%, which shows how much one high-rate account can skew the picture.
| Debt | Balance | Rate | Payment | Monthly interest | Interest share of payment |
|---|---|---|---|---|---|
| Credit card | $3,200 | 24.99% | $110 | $66.64 | 60.6% |
| Car loan | $14,600 | 7.4% | $389 | $90.03 | 23.1% |
| Student loan | $21,000 | 5.5% | $228 | $96.25 | 42.2% |
| Personal loan | $5,500 | 13% | $185 | $59.58 | 32.2% |
| Total | $44,300 | 8.47% blended | $912 | $312.50 | 34.3% |
How does your debt total relate to debt-to-income ratio?
Debt-to-income ratio, or DTI, divides your monthly debt payments by your gross monthly income. This calculator does not ask for income, but the arithmetic is quick. If the example borrower earns $5,800 a month before taxes, the $912 in payments is a DTI of about 15.7%.
Lenders evaluating a mortgage or other large loan typically add the proposed housing payment. Including an illustrative $1,450 housing payment would raise the figure to about 40.7%. Requirements vary by lender and loan type, and a ceiling of 43% is a commonly cited reference point, so knowing your number in advance helps you see how much room you have.
Terms used on this page
- Debt-to-Income Ratio (DTI)
- Debt-to-income ratio is the share of your gross monthly income that goes to required debt payments, such as loan installments, minimum card payments and housing. Lenders use DTI to judge whether you can take on another payment. A lower ratio signals more room in your budget and generally makes approval easier.
- Interest Rate
- An interest rate is the price of money, stated as a percentage of the balance per year. Borrowers pay it to lenders, and savers earn it from banks. The rate alone does not include fees or compounding, so it can understate the true yearly cost of a loan or overstate a simple comparison of savings accounts.
- Debt Avalanche
- The debt avalanche is a payoff strategy where you pay the minimum on every debt and put all extra money toward the balance with the highest interest rate first. When that debt is gone, its payment rolls to the next-highest rate. Mathematically, it usually minimizes total interest and often finishes as fast or faster than other orders.
- Debt Snowball
- The debt snowball is a payoff strategy where you pay minimums on everything and direct all extra money to the smallest balance first, regardless of interest rate. Each payoff frees up a payment that rolls into the next-smallest debt. It can cost more interest than the avalanche but delivers quick wins that help many people stay on track.
- Debt Consolidation
- Debt consolidation means combining several debts into one new loan or account, ideally with a lower interest rate and a single monthly payment. Common tools include personal loans, balance transfer cards and home equity loans. It saves money only if the new rate and fees are lower and you avoid running the old balances back up.
How Much Do You Owe Calculator: common questions
What should I include when adding up my debt?
Include every balance you are repaying: credit cards, car loans, student loans, personal loans, medical payment plans and any installment purchases. A mortgage can go in too, but many people list it separately because its size swamps everything else. Use current balances from your latest statements. Leaving a balance out makes the total and the blended rate look better than they are.
What is a blended interest rate?
It is a balance-weighted average of all your debt rates. Each rate counts in proportion to how much you owe at that rate. It is useful for comparing your overall borrowing cost with an offer, but it is not a rate any lender charges, and it can mask a small, very high-rate balance.
Is a blended rate the same as the average of my rates?
No. A simple average treats every debt equally regardless of size. In the example, a simple average of 24.99%, 7.4%, 5.5% and 13% is 12.72%, while the balance-weighted blended rate is 8.47%, because the two lowest-rate loans make up most of the balance. The weighted version is the one to compare with a consolidation offer.
How much interest am I paying a month on all my debts?
Multiply each balance by its annual rate, divide by 12 and add the results. The calculator does this for you as total monthly interest. That amount is consumed by interest before any of your payments reduce principal, so it shows how efficiently your payments are working. Watching this number fall from month to month is a simple way to track progress.
Where can I see all of my debts in one place?
Your credit reports from the three nationwide credit bureaus list most loans and cards with their balances, and you can get them free. Some debts, such as certain medical bills or loans from family, may not appear. Cross-check the report against your own statements, then enter the balances here. Reviewing your reports also helps you spot accounts you do not recognize, which you can dispute with the credit bureau.
How much total debt is too much?
There is no single number. What matters is whether payments fit comfortably in your income and whether balances are falling. Debt-to-income ratio and the share of payments going to interest are better signals than the total alone. A large, low-rate loan being repaid on schedule can be less of a strain than a small, growing card balance.
Should I pay off the debt with the highest rate or the smallest balance first?
Paying the highest rate first usually saves the most interest; paying the smallest balance first clears accounts sooner. Both work if you stick with them. Once your debts are listed here, the debt avalanche and debt snowball calculators can show the time and interest difference for your numbers. The best choice is the one you will stick with month after month.
Does the total debt figure include interest I haven't been charged yet?
No. It uses current balances, which include interest already added but not future interest. To see what the debts will cost through payoff, run them through a payoff calculator, which adds the interest that accrues month by month. That is why two people with the same total debt can face very different costs depending on their rates and payments.
Why is my total monthly interest so high compared with my payments?
Usually because one or more balances carry a high rate or the payments are close to the minimum. When interest takes a large share of a payment, the balance falls slowly. Directing extra money to the debt with the highest monthly interest relative to its payment tends to improve the ratio fastest.
Sources
- Credit reports and scores — Consumer Financial Protection Bureau. Accessed October 17, 2026.
- AnnualCreditReport.com — Central Source LLC (authorized by federal law). Accessed October 17, 2026.
- Consumer Credit – G.19 statistical release — Federal Reserve Board. Accessed October 17, 2026.
- Credit cards — Consumer Financial Protection Bureau. Accessed October 17, 2026.
We cite primary sources: regulators, central-bank data and federal agencies. Worked examples on this page are our own calculations, last checked October 17, 2026. See our methodology.