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Extra Payment Calculator

The extra you pay each month is the single biggest lever on your debt-free date. Drag the slider and watch the interest saved and time saved change instantly.

Your debts

Add each balance, its APR, and the monthly minimum (or let us estimate it). Everything is calculated in your browser — your numbers never leave your device.

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Plan by

The single biggest lever on your payoff date.

Payoff strategy

Avalanche: highest APR first — least interest paid.

One-time extra payments

Throwing a tax refund or bonus at your debt? Add it here to see how much faster it gets you to $0.

Totals: you'll pay $21,594 over the life of the plan, including $4,094 in interest. Estimates only — actual minimums and interest vary by lender. See our methodology.

Why extra payments are so powerful

Your minimum mostly covers interest. Every dollar above it goes straight to principal, which reduces next month's interest, which frees more for principal — a compounding effect in your favor.

Find your number

Use the slider above to test different extra amounts. Even small, consistent increases move your debt-free date dramatically. Then lock it in by automating the payment. Pair this with the avalanche method to maximize the savings.

Frequently asked questions

How much does an extra payment save?
It depends on your APR, but extra payments go straight to principal, so the savings compound. On high-interest debt, an extra $100–200/month commonly saves thousands in interest and years of payments.
Is it better to pay extra or invest?
Guaranteed return = your debt APR. Paying off a 24% card beats almost any investment risk-free. For low-rate debt the answer is less clear-cut.
Where should my extra payment go?
To one debt at a time — the highest APR (avalanche) or smallest balance (snowball) — not spread across all debts. Concentrating it is what creates the snowball effect.