The true cost of debt
How Much Interest Am I Paying on My Debt?
A financial diagnostic that shows exactly what your debt costs in interest, this month, this year, and over its life.
Most people know how much debt they owe, but very few know how much interest they are paying. Depending on your balance, interest rate, and monthly payment, interest can quietly cost thousands or even tens of thousands of dollars over time.
Use the calculators to put a real number on what your debt is costing you, then see how much of that you can take back.
Quick answer
Interest is the cost of borrowing money. The higher your balance and interest rate, the more of your payment goes toward interest instead of reducing your debt.
Why interest matters more than most people realize
Interest determines how expensive your debt becomes over time. The same $10,000 balance can cost wildly different amounts depending only on the interest rate. Paying $250 a month:
| Debt balance | APR | Total interest paid |
|---|---|---|
| $10,000 | 5% | ~$962 |
| $10,000 | 15% | ~$3,949 |
| $10,000 | 25% | ~$11,724 |
Same balance, same payment, but the 25% APR version costs over 12 times more interest than the 5% version. The rate, not just the balance, is what makes debt expensive.
Interactive debt interest calculator
Enter your balance, rate, and monthly payment to see your interest this month, this year, and over the life of the debt.
Debt Interest Calculator
See what your debt actually costs in interest. Updates instantly.
$183
Interest this month
$2,050
Interest this year
$5,596
Lifetime interest
October 2030
Projected payoff date
Total you will repay: $15,596 over 4 yrs 4 mos
How much interest does different debt cost?
Credit cards are the most expensive common debt; mortgages are the cheapest. Here is where typical borrowing products fall:
| Debt type | Typical APR | Interest cost risk |
|---|---|---|
| Credit card | 20%–29% | Very high |
| Personal loan | 7%–20% | Moderate to high |
| Student loan | 4%–8% | Low to moderate |
| Auto loan | 5%–15% | Moderate |
| Mortgage | 6%–7% | Low (and often tax-advantaged) |
If most of your balance sits in the top row, your interest cost is highest and your payoff should usually start there. Lower-rate debt like student loans and mortgages is far less urgent.
How much interest can extra payments save?
Even small extra payments often cut interest dramatically, because they lower your principal faster. On a $10,000 balance at 20% APR with a $300 base payment:
| Extra monthly payment | Time saved | Interest saved |
|---|---|---|
| $25 | ~6 months | ~$579 |
| $50 | ~10 months | ~$1,026 |
| $100 | ~16 months | ~$1,675 |
| $200 | ~25 months | ~$2,453 |
| $500 | ~35 months | ~$3,411 |
Try this on your own numbers in the savings simulator below, or read how much faster an extra $100 per month makes you debt-free.
Where does my payment actually go?
Most debt payments are split between interest and principal, and the higher your APR, the bigger the interest slice. Here is how a $200 payment on a $5,000 balance splits at different rates:
Interest Principal
At 25% APR, more than half of that payment never touches what you owe, which is exactly why high-rate balances fall so slowly.
How much interest is too much?
As a rough guide, paying more than about $2,000 a year in interest is a signal to act, and more than $5,000 a year usually means high-rate debt is working against you. Use this only as a gut check:
| Interest paid per year | Interpretation |
|---|---|
| Under $500 | Generally manageable |
| $500–$2,000 | Worth reducing, but not alarming |
| $2,000–$5,000 | Meaningful drag; prioritize paying it down |
| $5,000–$10,000 | High; likely high-rate debt that needs a plan |
| Over $10,000 | Very high; interest is a major financial leak |
Context matters. Income, assets, and debt type should also be considered. A high mortgage interest figure is very different from the same amount on credit cards.
Warning signs you’re paying too much interest
- Most of your payment goes to interest
- Your balance barely decreases
- Interest exceeds what you save each month
- You continue carrying high-interest credit card balances
- You only make minimum payments
How to reduce interest costs
The fastest way to reduce interest is to lower your principal faster. A simple framework:
- Make extra payments — every extra dollar goes straight to principal.
- Target the highest-interest debt first to kill the most expensive interest. See which debt to pay first.
- Avoid adding new balances so you are not refilling the hole.
- Refinance when appropriate (a lower rate or balance transfer that genuinely saves money).
- Use the avalanche or snowball strategy to stay organized and consistent.
See exactly how much interest you can save
Debt Driver turns these numbers into a plan for your real debts. It helps you:
- Forecast your interest costs
- Compare payoff strategies
- Track balances
- Test extra payments
- Visualize interest savings
- Build a personalized debt payoff plan
Related reading: what happens if you only make the minimum payment?, credit card or personal loan first?.
Interest savings simulator
Add an extra monthly payment to see exactly how much interest you would save and how much sooner you would be debt-free.
Interest Savings Simulator
See how much interest an extra payment saves you.
$2,097
Interest saved
1 yr 6 mos
Time saved
April 2029
New debt-free date
How much is interest really costing you?
Debt Driver runs these numbers across all your debts and shows your total interest, debt-free date, and exactly how much you can save.
See My Interest Savings →Frequently asked questions
How do I calculate interest on debt?
Multiply your balance by your monthly interest rate, which is your APR divided by 12. For example, a $10,000 balance at 24% APR has a monthly rate of 2%, so it accrues $200 of interest the first month. Whatever your payment does not cover in interest goes to principal. To find lifetime interest, you total the interest accrued each month until the balance reaches zero, which a calculator does for you.
How much interest am I paying each month?
Your monthly interest is your current balance times your APR divided by 12. On $5,000 at 24% APR that is about $100 a month; on $15,000 at 10% APR it is about $125 a month; on $35,000 at 6% APR it is about $175 a month. As your balance falls, the monthly interest falls with it.
Why does my balance go down so slowly?
Because interest is charged first, and on high-rate debt it eats most of your payment. On $10,000 at 24% APR, the first month’s interest is about $200, so a $300 payment only reduces the balance by $100. Until the balance shrinks, the interest portion stays large and progress feels slow.
What debt has the highest interest rates?
Credit cards are usually the most expensive, often 20% to 29% APR, followed by payday and some buy-now-pay-later products. Personal loans typically run 7% to 20%, auto loans 5% to 15%, student loans 4% to 8%, and mortgages are usually the lowest. The higher the rate, the more urgent it is to pay down.
How can I reduce interest costs?
Lower your principal faster and lower your rate. Pay more than the minimum, target the highest-interest debt first, stop adding new charges, and refinance or use a balance transfer when it genuinely lowers your rate. The single biggest lever is paying extra toward principal, because it removes all the future interest that balance would have generated.
Do extra payments reduce interest?
Yes, significantly. Extra payments go entirely to principal, which lowers every future month’s interest. On $10,000 at 20% APR with a $300 payment, adding $100 a month saves roughly $1,700 in interest and clears the debt about 16 months sooner.
Should I pay off high-interest debt first?
Usually yes. Paying the highest-interest debt first (the avalanche method) minimizes total interest and is mathematically the fastest, lowest-cost approach. If you need motivation, the snowball method (smallest balance first) can keep you consistent at the cost of a little extra interest.
Debt Driver is a debt payoff planning app. We are not a lender, debt-settlement company, or credit-counseling agency. The calculators, tables, and examples above are illustrative and use standard amortization math; your actual interest depends on your real balances, APRs, payment timing, fees, and behavior. Typical APR ranges are general estimates and change over time. Nothing here is financial, tax, or legal advice.