How does the loan payoff calculation work?

Each month the balance grows by its interest — balance × (APR ÷ 12) — and then shrinks by your payment. The tool repeats this month by month until the balance reaches zero, counting the payments and summing the interest.

Why does my balance barely move at first?

Early on, a large share of each payment goes to interest rather than the principal. As the balance falls the monthly interest falls too, so more of each payment reduces the principal and the balance drops faster toward the end.

What happens if my payment is too small?

If your monthly payment is less than or equal to the first month's interest, the balance never falls and the debt never clears. The calculator warns you and shows the minimum payment needed to make any progress.

Does paying a little extra really help?

Yes — because interest compounds on the remaining balance, even a small extra payment each month can cut months or years off the term and save significant interest. Try adding an extra amount to see the effect.

Is my financial data private?

Completely. Every figure is calculated inside your browser and nothing you enter is sent to a server or stored.

What is the Loan Payoff Calculator?

Free loan payoff calculator. Enter your balance, interest rate (APR) and monthly payment to see how many months it takes to clear the debt, the total interest, and how much faster an extra payment gets you there. Runs entirely in your browser — nothing is uploaded. It runs free in your browser on Gera Tools, with nothing uploaded.

Loan Payoff Calculator

Name: Loan Payoff Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Loan payoff calculator — time and interest to clear a debt

Whether it is a personal loan, car finance or a credit-card balance, the two questions that matter are: how long until it is gone, and how much interest will it cost? This calculator answers both from three inputs — your balance, the APR and your monthly payment — and shows how much an extra payment each month accelerates the payoff.

How it works

The tool models the debt month by month. Each month it adds interest of balance × (APR ÷ 12), subtracts your payment, and repeats until the balance reaches zero, counting the months and totalling the interest. This is the same declining-balance method lenders use.

Worked example

A balance of 10,000 at 18.9% APR with a 300 monthly payment:

First month interest: 10,000 × (0.189 ÷ 12) = 157.50
After the 300 payment the balance falls to 9,857.50
Repeating this, the debt clears in about 43 months and costs roughly 2,800 in total interest.

Adding just 50 more per month (350 total) clears it several months sooner and cuts hundreds off the interest.

Practical tips

Beat the minimum. Card minimum payments are often set just above the monthly interest, which stretches repayment over many years. Paying a fixed amount well above the minimum is the fastest way to escape the interest trap.

Target the highest rate first. If you have several debts, this tool shows the interest cost of each — a strong argument for overpaying the highest-APR balance first (the avalanche method).

Fixed-rate assumption. The calculation assumes the rate and payment stay constant. Variable rates or changing payments will shift the result, so re-run it when your circumstances change.

All calculations run entirely in your browser — nothing is uploaded or stored.