Loan Debt Payoff Calculator
See exactly when you'll be debt-free, how much interest you'll pay, and how much faster extra payments get you there.
| Debt-free date | — |
| Total interest paid | $0 |
| Total paid | $0 |
| Monthly payment used | $0 |
How it works
Each month the calculator adds one month of interest (balance × APR ÷ 12), then subtracts your payment. It repeats until the balance hits zero, counting the months. That month-by-month simulation is exactly how credit card statements accrue interest, so the result mirrors real life.
Formula & worked example
Formula: Each month the balance grows by APR ÷ 12, then your payment comes off: balance × (1 + APR ÷ 12) − payment, repeated until it reaches zero.
Worked example: A $3,000 balance at 18% APR paid at $120/month clears in 32 months, with about $788 paid in interest along the way.
When to use this
- One balance, one APR and one fixed amount you can pay — you want the debt-free date, not a guess.
- A card has been cut up and you are deciding what autopay amount actually ends it.
- You are comparing paying the balance off faster against a balance-transfer offer with a deadline.
- Minimum payments have stopped making sense and you want to see what a fixed payment does instead.
How to use it, step by step
- Enter the current balance exactly as the statement shows it.
- Enter the APR — the purchase APR if the card has several.
- Enter the fixed monthly payment you will make every month, not the minimum.
- Add any extra on top in the extra field and watch the months and interest fall.
- If the tool warns the payment does not cover the monthly interest, raise the payment until the warning clears — below that line the balance grows forever.
What the inputs mean
| Input | What it is | Typical values |
|---|---|---|
| Current balance | What you owe today on this one debt | Use the statement balance, including any pending interest |
| APR | The annual rate charged on the balance | Bank cards commonly 18–28%; store cards often higher |
| Monthly payment | The fixed amount you commit to each month | Must beat the monthly interest or the debt never dies |
| Extra payment each month | Added on top of the base payment | Even $25–$80 shortens high-APR debts by many months |
Another worked example
A $5,200 balance at 23.99% APR, paid at $200 a month plus $80 extra ($280 in total): the debt clears in 24 months with $1,364.98 of interest and $6,564.98 paid overall. At the $200 alone it takes 38 months and $2,211.45 of interest, so the extra $80 buys debt freedom 14 months sooner and saves $846.47.
Frequently asked questions
Debt avalanche vs. debt snowball — which is better?
The avalanche (pay highest APR first) costs the least in interest. The snowball (pay smallest balance first) gives faster wins that keep you motivated. Both beat minimums — pick the one you'll stick with.
Why do minimum payments take forever?
Minimums are often 1–2% of the balance, barely covering interest. On an $8,000 balance at 20% APR, a $160 minimum can take 7+ years and cost over $5,000 in interest. Raise the payment above to see the difference.
Does an extra $50 a month really help?
Enormously. Extra payments go 100% to principal, which shrinks every future interest charge. Try adding $50 or $100 in the extra-payment field and watch months and interest collapse.
What happens if my payment does not cover the monthly interest?
The balance grows instead of shrinking — each month adds more interest than you pay off, and the debt never ends. This calculator flags that case with a warning rather than inventing a payoff date. The fix is mechanical: raise the payment above the monthly interest line (balance times APR divided by 12) and the countdown starts.
Should I use this for a car loan or another fixed-term loan?
Not really. This tool assumes an open-ended balance where you choose the payment, like a credit card. A car loan already has its payoff date built into its term — what you want there is the effect of paying extra, which the Amortization Calculator and the Car Loan Calculator model with the loan's actual schedule.
How exact is the debt-free date?
It assumes the APR never changes, no new charges land on the balance, and every payment arrives on time. Real cards break all three assumptions occasionally — a rate rise or one emergency charge pushes the date out. Treat the month shown as the plan if nothing changes, and re-run it whenever the balance or rate moves.