Credit card payoff with extra payments calculator

Key takeaway: An extra payment works best treated as a bill made out to yourself — fixed amount, autopaid, no renegotiating when money gets tight. This calculator prices that commitment: the months it buys back and the interest it cancels versus sending only the minimum.

This calculator is for the moment the required minimum is covered and you're eyeing the rest of your budget, wondering whether $25, $50, or $100 a month toward the card is worth the squeeze. You know an extra payment "helps" — what you need is its literal worth in months and dollars.

Pick a number your budget can defend

The usual failure mode with extra payments isn't choosing the wrong amount — it's choosing one that quietly evaporates whenever spending runs hot. Size the extra like any fixed obligation: a figure you could still pay in a bad month, autopaid right after your paycheck lands.

Two results here price candidate amounts before you commit. Time your extra buys back is how many months earlier you finish than someone sending only the required minimum; interest your extra saves is the dollar gap between those paths. Nudge the extra field and both reprice instantly — the reason it's entered separately, unlike the combined payment the standard payoff calculator uses.

The math, spelled out in dollars

Each month your card charges one-twelfth of your APR on whatever you still owe. This calculator treats your minimum plus your extra as one combined payment: interest gets covered first, and everything left over attacks the balance itself — month after month until nothing remains.

With the defaults — a $6,200 balance at 22.9% APR (close to the current U.S. average of 24.35%), a $160 required minimum, and a $50 extra — the combined payment is $210. Month one's interest charge is about $118.32, so $91.68 of that first $210 actually shrinks the balance. Carried to the end, the card is clear in 44 months — 3 years 8 months — with $3,007 in interest. The minimum-only baseline needs 72 months and $5,185. Your $50, in other words, buys back 28 months and saves $2,178.

A windfall now vs. a drip forever

Is one big payment better than a steady small one? Early dollars save the most, and a windfall lands all at once: put a one-time $600 toward the default balance, go back to minimum-only, and payoff drops from 72 months to 59 while interest falls from $5,185 to about $3,731 — that single $600 erased roughly $1,454 of future interest, twice its size.

But a windfall only strikes once, while the $50 drip keeps landing and saves $2,178 over the full schedule. You don't have to choose: send the windfall the day it arrives and keep the extra running — model that by reducing the starting balance here.

Several cards, one extra

Carrying more than one balance? Resist splitting the extra evenly — that delays every finish line at once. Keep each card's minimum current, then aim the whole extra at a single target: the highest-APR card for the cheapest path (avalanche), or the smallest balance if quick wins keep you going (snowball). To sequence the extra across your whole stack, use the debt snowball vs. avalanche calculator.

When the extra isn't optional

Sometimes the extra isn't an optimization — it's the difference between a payoff date and none. If your required minimum is smaller than the monthly interest charge, minimum-only means the balance grows in place, forever. On the default $6,200 balance at 22.9% APR, month-one interest is about $118, so a fixed $115 minimum would never gain ground — yet a $50 extra clears the card in 67 months. There the savings results can't quote a number — the baseline has no finish line — so they say plainly that the extra makes payoff possible. (Most issuer minimums are percent-based and shrink with the balance — the minimum-payment-only calculator models that decaying payment.)

How we calculate this

This page runs the same month-by-month engine as the standard payoff calculator — but twice. The first pass uses your minimum plus your extra as the payment; the second uses the minimum alone, holding balance and APR identical. Months to pay off, the payoff date, and the interest and total-paid figures come from the first pass; time your extra buys back and interest your extra saves are the gaps between passes in payoff months and total interest. If the minimum-only pass never ends because the payment can't cover monthly interest, those results say so instead of quoting an unbounded number.

Frequently asked questions

Should I set my "minimum payment" here to my issuer's actual required minimum?

Yes — enter the dollar amount your statement lists as the required minimum, then put whatever you can realistically add on top in the extra payment field. Splitting them this way is what lets the comparison isolate the extra dollar's impact.

What do "Time your extra buys back" and "Interest your extra saves" compare against?

Both compare your plan — minimum plus extra — against a baseline where you send only the required minimum at the same balance and APR: the difference in payoff months, and the difference in total interest. If the minimum alone can't cover the monthly interest, there's no finish line to measure against, so those results tell you the extra is what makes payoff possible at all.

Is it better to make one extra payment or add it to my regular payment?

For interest purposes it doesn't matter whether the extra arrives as a separate payment mid-month or folded into one larger monthly payment — what matters is the total principal-reducing amount that lands before interest accrues the following month.

I have several cards — which one should get the extra?

Keep paying every card's required minimum, then send the entire extra to a single target rather than splitting it. The highest APR first minimizes total interest; the smallest balance first clears cards sooner and is easier to stick with. The debt snowball vs. avalanche calculator compares both orders across all your cards.

What if I can only afford a small extra payment some months?

Any extra, even inconsistent, helps — the calculator assumes a fixed extra every month to give you a clean estimate, but every dollar you add in any given month permanently reduces the balance interest is calculated on afterward.

Sources

• Federal Reserve, G.19 Consumer Credit report (Federal Reserve G.19 Consumer Credit report, as of 2026-05-01)
• Consumer Financial Protection Bureau, Credit cards