Debt Payoff Calculator
Calculate how long it will take to pay off your debt and how much interest you'll pay. See the impact of different monthly payment amounts on your payoff timeline.
A debt payoff calculator shows you the brutal truth about what high-interest debt actually costs — and, more importantly, how fast you can be free of it. Enter your balance, APR, and the monthly payment you can commit to, and the calculator returns the exact number of months to zero, total interest paid over that span, and total dollars out the door. Most people are shocked the first time they see this math: a $20,000 credit card balance at 22% APR with $400/month payments takes nearly 8 years to retire and costs roughly $18,000 in interest alone — almost doubling the original debt.
Two mainstream repayment strategies dominate personal finance: the **debt avalanche** (pay minimums on everything, throw every extra dollar at the highest-APR debt) mathematically minimizes total interest and time to debt-free. The **debt snowball** (attack the smallest balance first regardless of rate) trades a few hundred dollars of interest for faster psychological wins — closed accounts, visible momentum. A 2016 Kellogg School study found snowball users were more likely to stay the course, which is why Dave Ramsey popularized it. There's no single right answer; the best plan is the one you actually execute.
Use this calculator to model both. Run it once at your current payment, then bump the monthly payment by $100 or $200 and watch the payoff date and total interest collapse. The sensitivity is dramatic at high APRs because every extra dollar compounds against the balance instead of feeding the lender. This is a free educational tool, not financial advice — consult a nonprofit credit counselor (NFCC-affiliated) if you're considering debt management or consolidation.
Quick answer: A $20,000 debt at 18% APR paid down at $500/month takes about 62 months (5.2 years) to clear and costs roughly $10,800 in interest. Raising the payment by just $100/month typically cuts the timeline by 25% and saves thousands. This debt payoff calculator shows your exact months-to-zero and total interest for any balance, APR, and payment.
Inputs
Quick presetsCurrent balance on the card or loan you're targeting. For multiple debts, model them one at a time or use a weighted-average APR.
APR from your statement. US credit cards average 20–24%, personal loans 9–15%, federal student loans 5–8%, auto loans 6–10%.
What you'll send every month. Must exceed the monthly interest (balance × APR ÷ 12) or the debt never pays off — a common minimum-payment trap.
Results
How to use this calculator
Three inputs. **Total debt** is the current balance across the card or loan you're targeting; if you're aggregating multiple debts, use the weighted-average APR or model them one at a time. **Interest rate (APR)** is the annual percentage rate from your statement — US credit cards average 20–24% in the current rate environment, personal loans 9–15%, federal student loans 5–8%, auto loans 6–10%, mortgages 6–7%.
**Monthly payment** is the dollar amount you'll commit to sending every month. It must exceed the monthly interest charge (balance × APR ÷ 12) or the calculator will flag the debt as never paying off — a real trap many minimum-payment schedules fall into. Run the scenario, then re-run with payments $50, $100, and $200 higher to see how much time and interest each increment saves. For a $15,000 balance at 20% APR, moving from $300/month to $500/month cuts payoff from roughly 110 months to 38 months and saves over $10,000 in interest.
Worked examples
Maya, 29, tackling a credit card balance
Maya has a $12,000 credit card balance at 24% APR. Making only the 2% minimum payment ($240/month), the calculator shows payoff taking over 30 years and costing roughly $19,000 in interest — more than the original balance. She commits to $500/month instead. The calculator now projects 32 months to zero and about $3,800 total interest — an $15,000+ swing from the same debt, just by doubling the payment. Maya sets up an autopay for $500 the day after payday so the decision happens once.
Derek, 41, avalanche vs snowball tradeoff
Derek has three debts: $2,500 medical bill at 0%, $8,000 credit card at 22%, and $18,000 auto loan at 7%. With $900/month total to spend on debt, avalanche says attack the 22% card first — total interest across all three: ~$3,200, debt-free in 39 months. Snowball says kill the $2,500 medical bill first for the psychological win — total interest ~$3,700, debt-free in 41 months. The $500 difference is small; Derek picks avalanche because the rate gap is wide, but either method beats drifting with minimums.
Priya, 34, using a bonus to break the cycle
Priya is carrying a $9,400 credit card balance at 24% APR while paying $280/month — the calculator projects 66 months to payoff and over $8,200 in interest. She gets a $4,000 year-end bonus. Option A: apply the whole bonus as a lump sum against principal and keep paying $280. New payoff: 22 months, ~$1,500 interest — a ~$6,700 interest swing. Option B: keep the bonus in savings and raise the monthly payment to $400. New payoff: 32 months, ~$3,300 interest. Lump-sum-plus-same-payment wins decisively because the principal reduction compounds against 24% APR from day one.
Frequently asked questions
How do I decide between the snowball and avalanche methods?
Avalanche (highest APR first) saves the most money mathematically — often hundreds to thousands of dollars. Snowball (smallest balance first) delivers faster visible wins, which research shows improves follow-through. If your APR spread is large (one debt above 20%, others below 10%), avalanche wins easily. If all debts are similar APRs, snowball's motivation edge often makes it the practical winner.
Should I pay off debt or build an emergency fund first?
Build a starter emergency fund of $1,000–$2,000 first, then aggressively attack high-interest debt (above 8%), then finish building a full 3–6 month emergency fund. Without any cash cushion, the next unexpected car repair goes straight back onto the credit card, and you're running in place.
How much interest does a credit card really charge at the minimum payment?
Typically 2–3x the original balance over the life of the debt. On a $10,000 balance at 22% APR with a 2% minimum payment, you'd pay roughly $18,000 in interest over 30+ years. Minimum payments are calibrated to keep you paying forever — they're a product feature, not a repayment plan.
Does paying extra on a credit card actually help?
Enormously. Credit card interest compounds daily based on average daily balance. Every extra dollar paid reduces that balance immediately, so the next day's interest charge is lower. An extra $100/month on a $15,000 balance at 20% APR typically saves $4,000–$6,000 in interest depending on baseline payment.
What is a good APR on a personal loan for consolidation?
Below your current credit card APR is the bar. In the current US rate environment, personal loans for borrowers with 700+ credit scores range 9–15%. If you can move $15,000 from a 22% card to a 12% personal loan, the interest savings are large — just don't run the card back up, which is the #1 way consolidation fails.
When does it make sense to invest instead of paying off debt?
When the debt APR is below your expected after-tax investment return — roughly 6–7% for a long-horizon index portfolio. Mortgages at 4–5% and federal student loans at 4–6% often qualify. Credit cards at 20%+ never do; the guaranteed return from eliminating 22% interest beats any market strategy.
Why does my credit card balance barely go down even with big payments?
Because daily compounding means most of each statement's interest charge gets added before your payment posts. On a $10,000 balance at 22% APR, roughly $180 of interest accrues monthly. A $250 payment only reduces principal by $70. Paying twice a month (bi-weekly) shrinks average daily balance and cuts interest meaningfully.
Should I use a 0% balance transfer offer?
Useful if you can pay off the full balance during the 0% window (typically 12–21 months) — interest savings can be substantial. Watch the 3–5% transfer fee and the rate that kicks in after the promo. If you can't realistically retire the debt during the window, the post-promo APR often wipes out the benefit.