Debt Calculators
Free US Debt Calculators
Not sure which debt calculator you need? Every tool here is free, needs no sign-up and is built for US debts. Pick the one that matches your goal: the snowball builds momentum with quick wins, the avalanche minimizes the interest you pay.
Which debt calculator should I use?
- Several debts and want quick wins? Use the debt snowball calculator.
- Several debts and want to pay the least interest? Use the debt avalanche calculator.
- Can't decide between the two? The snowball vs avalanche calculator runs both on the same debts.
- Don't know what you can afford? Start with the budget planner.
Which debt payoff method should you use?
The debt snowball clears your smallest balance first for motivating quick wins, while the debt avalanche clears your highest interest rate first to pay the least total interest. The snowball keeps more people motivated; the avalanche saves the most money. Both work by paying every minimum and directing spare cash at one debt at a time.
Not sure which fits you? Read the snowball vs avalanche guide, or run both at once in the snowball vs avalanche calculator — enter your debts once and see both debt-free dates and total interest side by side in minutes.
What you need before you start
For each debt you need four things: the outstanding balance, the interest rate as an APR, the minimum payment, and the name of the creditor so you can tell them apart. Then one figure for yourself — the extra amount you can add on top of the minimums each month.
All four per-debt numbers are on your monthly statement. The balance and minimum payment are usually near the top; the APR is either alongside them or in your credit agreement. If a card sets its minimum as the higher of a fixed amount and a percentage of the balance — which most cards do — enter both, and the calculator will recalculate it each month as the balance falls.
Include every unsecured debt: credit cards, store cards, personal loans, auto loans and buy-now-pay-later. Leave out your mortgage and any priority bills such as property tax, rent or mortgage arrears, utilities, court-ordered payments and money owed to the IRS. Those are paid in full first and sit outside a payoff plan entirely — see the mortgage calculators for secured-debt decisions.
If you do not yet know your extra payment figure, work it out before you run anything. The budgeting calculators exist for exactly that, and a plan built on a number you cannot sustain is worse than no plan at all.
How to read your results
Both calculators return the same four outputs:
- Your debt-free date — the month the last balance hits zero, assuming you keep the extra payment going.
- Total interest paid — the real cost of the plan, and the number to compare between the two methods.
- Your payoff order — which debt gets the spare cash first, second and third.
- A month-by-month schedule — what to pay each creditor each month, which is the part you actually follow.
The comparison worth making is total interest against how the order feels. Run the snowball, note both numbers, then run the avalanche with identical inputs. If the interest difference is small — and across a typical US debt mix it often is — the method you will still be following in a year's time is the better one, whatever the math says.
What these calculators assume
Every projection holds your interest rates constant, adds no new borrowing, and ignores fees and charges. Those assumptions are what make a clean forecast possible, and they are also where a real payoff plan drifts from the model.
Specifically, both tools apply interest monthly at the APR you enter divided by twelve, then apply your payments. Percentage-based minimums are recalculated from the falling balance each month. Beyond that:
- Rates are held flat for the whole projection. A promotional 0% period ending, or a variable rate moving, is not modelled — re-run the numbers when either happens.
- No new spending is added. Putting fresh purchases on a card you are trying to clear invalidates the forecast faster than anything else.
- Fees, charges and missed-payment penalties are not included. Neither is a payment holiday.
- A minimum payment smaller than the monthly interest never clears the debt. If that is where you are, no ordering strategy fixes it, and free or low-cost help is the right next step — a nonprofit credit counseling agency through the NFCC can review your budget at no cost.
Treat the debt-free date as a projection you refresh, not a promise. Re-running it every few months, and after any rate change, keeps it useful.
Frequently asked questions
Are these debt calculators free?
Yes. Every calculator on DebtSnowball is free to use, with no sign-up, no account and nothing to download. They run in your browser, so the figures you enter stay on your device.
Which debt should I pay off first?
Always keep up the minimum payment on every debt. Then put any spare money at one debt at a time: the smallest balance first (the snowball) if motivation matters most, or the highest interest rate first (the avalanche) if you want to pay the least interest. The snowball vs avalanche calculator shows the difference for your own debts.
Do I need to enter my exact APR?
A close figure is enough to get a reliable payoff order and debt-free date, because the order depends on the relative sizes of your balances and rates rather than exact decimals. Your exact APR is on your monthly statement and in your credit agreement. If a debt is on a promotional 0% rate, enter 0 and re-run the calculation when the promotion ends, since the tool holds each rate constant for the whole projection.
Why does the calculator show a different minimum payment than my statement?
Most US credit cards set the minimum as roughly 1% of the balance plus that month's interest and fees, or a small flat floor, whichever is greater, so it falls as the balance falls. If you enter both a fixed amount and a percentage, the calculator recalculates the minimum each month the same way, which means the figure it shows will drift away from this month's statement as the balance drops. That is expected and matches how your card actually works.
How often should I re-run the calculation?
Every few months, and always after something changes the inputs: a rate rise, a promotional 0% period ending, a new debt, or a change in what you can afford to overpay. The projection assumes today's rates and no new borrowing, so it drifts from reality as those change. Re-running takes a couple of minutes and keeps the debt-free date honest.
Can I use these calculators for a 0% balance transfer card?
Yes — enter 0 as the rate for the promotional period. The important thing is the date the 0% ends, because the rate then jumps to the standard APR and the calculator will not switch over on its own. A common approach is to aim to clear the balance inside the promotional window, then re-run the numbers with the real rate if any of it is left.
In depth · Updated · 4 min read
The five numbers behind every debt payoff calculator
Every calculator in this section asks for the same five inputs. Understanding what each one does to the result helps you spot an unrealistic plan before you commit to it.
1. Balance: start from the statement, not memory
Use today's balance from online banking or your latest statement. Most people underestimate what they owe by a surprising margin — interest and fees creep in between statements. If a balance is on a promotional rate, note the date the promotion ends; you will need it later.
2. Interest rate: monthly interest is APR ÷ 12
Calculators work in months, so a yearly rate is divided by 12. On $5,000 at 22% APR, the first month's interest is about $5,000 × 0.22 ÷ 12 ≈ $92. That figure is the floor: any payment below it makes the balance grow, not shrink.
3. Minimum payment: the number that shrinks with you
Card minimums are usually a percentage of the balance plus interest, so they fall as you pay down — which is exactly why minimum-only repayment drags on for years. Our calculators hold your minimums fixed at today's figure, which is how most payoff plans work in practice: you keep paying what you pay now, and the "spare" part grows as balances fall.
4. Extra payment: the biggest lever
On $5,000 at 22%, paying $150 a month takes about 52 months and $2,798 in interest. Paying $250 takes about 26 months and $1,286 — half the time and less than half the interest, for $100 more a month. No ordering trick comes close to that effect.
5. Repayment order: snowball, avalanche or your own
Once every minimum is covered, the extra money goes to one debt at a time. The snowball targets the smallest balance for quick wins; the avalanche targets the highest rate to minimise interest. When your smallest debt also has the highest rate, both give the same answer. When your biggest debt carries the highest rate, the avalanche can save hundreds — compare them on your own numbers.
Methodology & trust
Written and reviewed by Peter Barclay, a UK Chartered Mechanical Engineer — who builds and maintains these tools, pairing engineering-mathematics training with a focus on the mechanics of debt repayment. The calculators use standard amortization formulas and fixed repayment orders. Read our methodology or more about the author.
DebtSnowball is not a financial adviser and is not authorised or regulated by the CFPB. These tools are for education and information only, not financial advice. If you are struggling with debt, get free, impartial help from the NFCC.
Last reviewed: October 2026 Spotted an error? Report it and we will fix it.