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Debt Payoff Calculator
Find out when you will be debt-free on your current payment — and what happens to that date if you add even a small amount each month.
Your debt
All calculations stay on your device.
Consolidating instead of paying down?
If your schedule above shows a date further out than you would like, combining several balances into one lower-rate loan sometimes shortens it. Compare the numbers before you decide — consolidation only helps when the new rate is genuinely lower and the term is not extended.
Why extra payments matter so much
With a revolving debt like a credit card or store card, a large share of every payment goes to interest. Any extra amount you pay goes entirely to the principal — which reduces the balance that interest is charged on next month. That creates a compounding effect in your favour.
The snowball works both ways: the same compounding that makes debt grow when you only pay the minimum makes it shrink fast when you overpay. Small, consistent overpayments are often the difference between years of payments and months.
Two ways to attack multiple debts
| Method | How it works | Best for |
|---|---|---|
| Avalanche | Pay minimums on everything, throw all spare money at the highest-rate debt | Paying the least total interest |
| Snowball | Pay minimums on everything, throw all spare money at the smallest balance | Staying motivated with quick wins |
Mathematically the avalanche saves more money. Practically, the snowball keeps more people going. Both beat doing nothing — pick the one you will actually stick to.
How to use this calculator
- Enter the current balance on the debt you want to clear.
- Enter its interest rate.
- Enter the payment you make now.
- Add any extra you could realistically pay each month, and watch the payoff date move.
Warning: If your payment is not larger than the monthly interest charge, the balance will never fall. This calculator will tell you when that is the case — that is the single most important signal it gives you.
Frequently asked questions
Why does my balance barely move each month?
Early on, most of your payment covers interest rather than principal. As the balance falls, the interest portion shrinks and progress accelerates. Raising the payment speeds this up dramatically.
Should I pay off debt or save first?
A common approach is to keep a small emergency buffer, then direct spare money to the highest-rate debt. If your debt rate is far above what savings earn, clearing debt usually wins mathematically.
Does this handle more than one debt?
This tool models one debt at a time so the numbers stay clear. Run it once per debt and compare the payoff dates to decide which to attack first.
Is consolidating my debts a good idea?
Consolidation can lower your rate and simplify payments, but it can also stretch the term and increase total interest, or move unsecured debt onto your home. Compare total cost, not just the monthly payment.
Methodology and sources
The debt payoff formula is standard amortisation mathematics, documented by the Federal Reserve and used by lenders worldwide.
- Federal Reserve — Consumer Credit (G.19)Board of Governors of the Federal Reserve System
- CFPB — Debt collectionConsumer Financial Protection Bureau
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