Can I use one calculator for several debts?

Run it once per debt to see each timeline, then attack one at a time while paying minimums on the rest. When one clears, add its payment to the next — the amount you attack with grows each time.

What if the calculator says my debt never clears?

Your payment is below the monthly interest charge, so the balance grows. The fix is either a higher payment or a lower rate; if neither is available, that is the signal to look at consolidation or to seek free debt advice rather than to keep paying.

Should I include my mortgage?

Usually not in the same plan. A mortgage at around 6.67% is a different problem from a card at around 21%, and clearing the expensive debt first is almost always the better use of a spare dollar.

How often should I recalculate?

Every couple of months. The number moves slowly, and checking it weekly makes steady progress feel like no progress.

Debt Payoff Calculator: How to Build a Plan You'll Actually Stick To

The value of a payoff calculator isn’t the finish date. It’s that it converts a vague, heavy feeling into a specific number you can argue with. Then it shows you exactly what changing one variable is worth.

Payoff calculator

Runs entirely in your browser. Nothing is sent anywhere, and nothing is stored.

BalanceInterest rate (APR %)Monthly payment

Assumes a fixed rate, a fixed payment, and no new spending on the balance. Real statements vary — treat the result as a planning estimate, not a quote.

What to enter

Balance: the current amount, not the original loan.

Interest rate: the APR from your statement or agreement. If you genuinely don’t know it, that’s the first thing to go and find; it’s the variable that decides how urgent this debt is compared with your others.

Monthly payment: what you can realistically pay every month, including the bad ones. Not your best month. A plan built on your best month fails in month three, and the failure feels like personal weakness when it was really a modelling error.

Reading the result honestly

The interest total is the number that should sting. It’s what the debt costs on top of what you actually bought or borrowed for.

The “+$50” comparison is the useful part. Most people can’t double a payment; most people can find a modest amount for a while. Extra payments go straight against principal, so they reduce every future month’s interest. That’s why a small increase moves the timeline more than it seems it should.

“Never paid off” is the most important output. If your payment is below the monthly interest, the balance grows forever. That isn’t a discipline problem, it’s an arithmetic one, and it calls for a different response: a lower rate, a consolidation, or free debt advice from a nonprofit service rather than another month of paying into a rising balance.

Ordering several debts

Run the calculator once per debt. Then choose a target:

Highest interest rate first costs the least overall. With cards averaging 20.94% in May 2026 and mortgages around 6.67%, the ranking is usually obvious.
Smallest balance first clears an account sooner and delivers a visible win, which matters more than the maths admits — why the snowball works covers the evidence behind that.

Pay minimums on everything else while you attack the target. When a debt clears, roll its entire payment into the next one. The amount you’re attacking with grows every time, which is why payoff plans accelerate toward the end rather than plodding along at one speed.

Turning a projection into a plan

A number on a screen isn’t a plan. Four things make it one:

Automate the payment. A standing transfer on payday, not a monthly decision. Every month you have to decide again is a month you might not.

Protect the minimums. Autopay the minimum on every other debt. Missing one costs a fee, possibly a penalty rate, and a mark on your payment history, which is 35% of a credit score and the slowest thing to repair.

Keep a small buffer. This feels wrong when the goal is to clear debt, and it’s what stops the plan resetting. Without any cushion, the next car repair goes on the card you just paid down. The CFPB’s guidance is to start from the unexpected expenses you’ve actually had rather than a textbook figure — even a small buffer changes the outcome. Where to keep it is worth ten minutes.

Recalculate every couple of months. Not weekly. Progress is real and slow, and daily inspection makes it invisible.

When the numbers don’t work

If the calculator keeps returning “never paid off” no matter how you adjust, the problem isn’t the plan. Options at that point include negotiating the rate directly with the lender, consolidating into a genuinely lower rate — without simply stretching the term — or free advice from a nonprofit credit counselling service.

None of those are failure. Paying into a balance that grows anyway is the thing to avoid, and recognising it early is the whole point of running the numbers.

Run the numbers today, even if you don’t act on them for a week. A stale guess is worse than an accurate one you’re not ready to face yet. How to get out of debt picks up from here, and the debt and loans guide is the starting point if this is your first debt-related read.