See how much sooner you'll be debt-free when you add an extra monthly payment.
A free debt payoff planner that shows you the exact months and dollars an extra monthly payment saves — works for credit cards, personal loans, medical bills, and any fixed-APR debt.
Direct answers to the most common questions, in plain language. Skim if you're in a hurry; dig deeper below.
On most consumer debts, $100 extra cuts payoff time by 30–50%.
An extra $100 a month against the principal slashes the balance the next time interest is calculated, and every month after that. On a $10,000 balance at 18% APR with a $250 minimum, $100 extra typically cuts payoff from ~5 years to roughly 2.5–3 years and saves thousands in interest.
Yes — minimums are designed to maximize interest, not progress.
Minimum payments are calculated to keep you in debt for the longest legally acceptable time. Any dollar above the minimum goes 100% to principal, which reduces the base used to calculate every future interest charge.
Your balance will grow, not shrink.
If the minimum payment is less than the monthly interest, the unpaid interest is added to your balance (negative amortization). You owe more next month than this month. Increase the payment or your debt compounds against you forever.
Yes — use avalanche (highest APR first) or snowball (smallest balance first).
Sending every spare dollar to one debt at a time mathematically beats spreading it thin. Avalanche (highest APR) saves the most money. Snowball (smallest balance) builds the most momentum. Pick the one you'll actually stick with.
The mechanics in short answers — no jargon, no upsell.
Each month, your lender multiplies the outstanding balance by (APR ÷ 12). That number gets added to your balance before your payment is applied.
Of every dollar you send, the lender takes interest first. Only what's left chips away at the principal — the balance that actually drives future interest.
Anything you pay above your minimum goes straight to principal. That smaller balance means lower interest next month, then the month after, then forever.
An extra $50 today removes $50 from every future interest calculation. The same $50 with one year left does almost nothing. Start now, not later.
Designed so anyone can model their situation in under a minute, with or without a finance background.
Instantly know the exact month you become debt-free at your current and proposed payment.
See in dollars and months what a small monthly top-up does to your total interest bill.
Baseline (minimum) vs your plan (with extra) — months saved, interest saved, total paid.
Get a warning if your minimum payment is too low to cover interest — before the balance starts growing.
Credit cards, personal loans, medical bills, BNPL — anything with a balance, APR, and monthly payment.
Pick a payment you can actually sustain, then watch the calendar collapse in real time.
Everything you might ask before, during, or after using this tool.
Avalanche pays off the debt with the highest APR first, regardless of balance — mathematically optimal, saves the most interest. Snowball pays off the smallest balance first — slower on paper but builds psychological momentum. If you've quit a debt plan before, snowball; if you stick to spreadsheets, avalanche.
Consolidation makes sense if you can get a meaningfully lower APR (e.g. a personal loan at 10% replacing credit cards at 24%), you have stable income, and you won't run the credit cards back up. It rarely makes sense if the new loan's APR is similar to your current rate, or if the consolidation is via a 0% promo card you might not pay off in time.
Lenders generally like total monthly debt payments under 36% of gross monthly income, with housing under 28%. Above 43% and most lenders won't approve a mortgage. The lower the better — under 20% gives you significant financial flexibility.
For revolving debt like credit cards, paying off balances helps your score by lowering utilization. For installment loans, closing them removes a positive open account, which can dip your score 5–20 points temporarily — but the dip is small and short-lived, and being debt-free is the real win.
Most US consumer loans (personal loans, credit cards, federal student loans) have no prepayment penalty. Some mortgages and auto loans do — check your loan agreement for a "prepayment penalty" clause. If there is one, math out whether the interest you save exceeds the fee.
At minimum, capture any employer 401(k) match — that's a 100% return, beating any debt rate. Beyond that, compare your debt APR to your expected after-tax investment return. Credit card debt at 20%+ almost always beats investing. Mortgage at 6% is a closer call.
Call the lender before missing a payment — most have hardship programs that reduce or pause payments temporarily. Missing payments without communicating triggers late fees, penalty APRs (often 29.99%), and credit-report damage. A non-profit credit counselor (NFCC.org in the US) can help structure a payment plan.
No — it assumes a fixed APR for the life of the debt. Most credit cards have variable rates tied to the prime rate. If your APR changes, recompute. The math direction (extra payments save interest) doesn't change, but the exact numbers will move.
Other Lazysmirk tools that pair well with this one.
See how fast you can become debt-free with the snowball method — pay off your smallest debt first, then roll the payments forward. Compare snowball vs avalanche side by side.
See exactly how many months it will take to pay off your credit card — and how much interest you'll save by paying more than the minimum. Free, instant, no signup.
Calculate your monthly EMI, total interest, and full repayment cost on any personal loan. Compare lenders, model prepayments, and avoid the flat-rate trap.
Calculate your monthly payment, total interest, and payoff date for any student loan — then model how extra payments or a lump sum can cut years off your debt.
See how extra EMI payments, yearly prepayments, and lump-sum part payments reduce your home loan tenure and save thousands in interest.
The avalanche method tells you to pay minimums on every debt, then throw all your extra money at the one with the highest APR. Mathematically, it saves the most interest. On paper it always wins.
The snowball method tells you to pay minimums on every debt, then attack the smallest balance first, regardless of rate. You knock out a debt fast, feel something, and use that momentum on the next one. The total interest paid is slightly higher, but the completion rate is dramatically higher — and a method you finish beats a method you quit.
If you've never carried out a debt plan to the finish, start with snowball. If you have, run avalanche. Either way, pick one and don't switch midway.
Consolidation is borrowing one new loan to pay off several existing debts. It works when three things are true: the new APR is meaningfully lower than your weighted-average current APR, your income is stable enough to handle a fixed payment, and you have the discipline not to re-load the credit cards you just paid off.
A personal loan at 11% replacing four credit cards averaging 23% APR? Strong yes. A 0% balance transfer card with an 18-month promo and a 3% transfer fee, when you have the discipline to pay it off in 18 months? Yes. Borrowing against home equity to pay off credit cards? Slow down — you're turning unsecured debt into debt secured by your house.
Debt-to-income (DTI) is the percentage of your gross monthly income that goes to required debt payments — housing, car loans, student loans, credit-card minimums, child support. Under 28% just for housing, under 36% all-in, is the conventional bar most lenders use.
Above 43% all-in, most mortgage lenders won't approve you. Above 50%, you're in the danger zone where one bad month can cascade. The calculator above shows you what a higher payment does to payoff time; complement it by tracking DTI monthly to make sure the higher payment is actually sustainable.
The money that was going toward debt does not disappear. The day after your debt-free date, you have a sizable monthly cash flow that wasn't there before. Decide where it goes before you get it — emergency fund, retirement match, the next debt on the list, or a deliberate lifestyle upgrade.
The classic mistake is to absorb the payment back into general spending without noticing. The single best move post-payoff is to redirect at least the same dollar amount, automatically, to the next priority. You already proved you can live without it.
Two short notes worth reading before you trust any number on this page.
Your loan amount, rate, and prepayment inputs never leave your device. No accounts, no cookies on your numbers, no analytics on the values you type. Disconnect from the internet and it still works.
We are not a bank, NBFC, advisor, broker, or distributor of any financial product. The numbers shown here are estimates for educational purposes only, based on the inputs you provide.
Results are not financial, legal, or tax advice. Please consult a qualified professional before any decision about your loan, investments, or personal finances. Actual loan terms and charges depend on your bank and individual circumstances.
