Loan Repayment Calculator

Every fixed-rate loan follows an amortization schedule that determines how each payment is split between principal and interest. In the early months, the vast majority of each payment goes toward interest because the outstanding balance is at its highest. A $300 monthly payment on a 6% loan might apply only $50 to principal in month one and $250 to interest. As the principal decreases over time, the interest portion shrinks and more of each payment chips away at the actual debt.

This front-loading of interest has a critical implication: extra payments made early in the loan term eliminate far more total interest than the same dollars applied late in the term. When you pay extra in month six versus month 54, you're preventing those dollars from generating compounding interest for years. The amortization schedule in this calculator makes this effect visible — you can watch the interest portion collapse when you model an extra monthly payment starting immediately.

Making even small extra payments can dramatically reduce both the total interest paid and the loan duration. When you pay an additional amount beyond the minimum, the entire extra amount goes directly toward principal reduction. Because interest is recalculated each period on the remaining balance, a lower principal means a lower interest charge the following month — creating a compounding savings effect that accelerates over time.

For a typical 30-year mortgage at 7%, adding just one extra payment per year can shave off nearly five years from the loan term and save tens of thousands in interest. Even on a 5-year auto loan, an extra $100 per month on a $25,000 balance at 6.5% eliminates more than a year of payments and over $1,000 in interest. The earlier in the loan term you begin the extra payments, the greater the leverage — each dollar reduces the base on which future interest compounds.

When evaluating loans, the interest rate is only one piece of the total cost picture. Two loans with the same rate but different terms can have vastly different lifetime costs. A 36-month auto loan at 6% costs significantly less total interest than a 72-month loan at the same rate — even though the monthly payment is higher. The shorter term also means you build equity faster and are less likely to find yourself underwater if the asset depreciates quickly.

The Compare mode in this calculator lets you place two loan scenarios side by side: different rates, different terms, or both. You can instantly see the difference in monthly payment, total interest paid, and payoff date. Use this when shopping between lenders, deciding between a shorter or longer term, or weighing a 0% dealer financing offer against a lower-rate bank loan with a rebate. Often the math reveals that the advertised deal is not the cheapest option when total cost is measured.

Goal-based repayment reverses the standard loan calculation. Instead of accepting whatever payoff timeline the minimum payment produces, you choose your target freedom date and work backward to find the required monthly payment. This approach is particularly powerful when you want to align debt payoff with a specific life milestone — eliminating a car payment before a new child arrives, paying off a personal loan before starting a business, or clearing all consumer debt before retirement.

Goal Mode in this calculator handles the math automatically. Enter your desired payoff date and the calculator solves for the exact monthly payment needed to hit it, accounting for your current balance and interest rate. It also shows how much extra you need to contribute above the minimum payment and the total interest saved compared to paying on schedule. This turns an abstract goal into a concrete, actionable monthly number you can immediately build into your budget.