Loan Calculator

How to Use the Loan Calculator

This loan calculator gives you a clear picture of what a loan will actually cost. Enter the loan amount you want to borrow, the annual interest rate offered by your lender, and the term over which you plan to repay it. The tool instantly returns the monthly payment, the total interest you will pay across the life of the loan, the total amount paid back, and the projected payoff date. There is no submit button: every result updates the moment you change a number, so you can quickly try different scenarios side by side.

If you can put extra money toward the loan each month, type that figure into the optional extra payment field. The calculator then shows two additional numbers: how much interest you save and how many months earlier the loan is paid off. This is one of the most powerful planning features for anyone with a mortgage or a high-interest personal loan, because even a modest additional payment can shave years off the schedule and save thousands in interest. Use the currency selector to switch between US dollars, euros, British pounds, Japanese yen, Korean won, Australian dollars, and Canadian dollars; your choice is remembered between visits.

Reading the Amortization Schedule

• Principal vs interest split: early payments are mostly interest, late payments are mostly principal. The schedule and the visual bar make this concrete.
• Balance column: shows the remaining loan balance after each payment, useful for understanding how slowly equity builds in the early years.
• Payment date: dates are projected from the start date you entered, assuming one payment per calendar month.
• Extra payment effect: when you add an extra monthly amount, the principal column grows, the loan ends sooner, and total interest drops.
• Show full schedule: by default only the first twelve months are shown to keep the page readable. Toggle to expand the full table when you need it.

Why Loan Math Matters

Most borrowers focus on a single number when shopping for a loan: the monthly payment. That number is important because it is the amount you actually have to send to your lender each month, but it is only part of the picture. Two loans with the same monthly payment can differ by tens of thousands of dollars in total interest if the rates and terms are different. Running the numbers before you sign anything turns a vague decision into a concrete one and helps you compare offers fairly. A loan calculator is also a powerful negotiation tool, because it lets you see the dollar impact of a quarter-point rate difference rather than just an abstract percentage.

Understanding the difference between the interest rate and the annual percentage rate, or APR, is essential. The interest rate is the cost of borrowing the principal, while the APR also includes lender fees, points, and certain closing costs. For mortgages in particular, two lenders can quote the same headline rate but very different APRs because of how they bundle fees. When comparing offers, look at APR for the true cost and use this calculator with the base interest rate to model your monthly cash flow. If you have closing costs, you can approximate their impact by adding them to the loan amount.

Amortization is the schedule by which a fixed-rate loan is paid down. Each month, the lender first applies enough of your payment to cover the interest accrued that month, then uses what remains to reduce the principal. Because interest is charged on the remaining balance, more of your payment goes to interest at the start of the loan and more goes to principal toward the end. This is why making extra principal payments early is so powerful: every dollar you pay above the minimum directly reduces the balance and shrinks all of the future interest charges that would have accrued on it.

Refinancing can make sense when interest rates drop significantly, when your credit score has improved, or when you want to change the term of the loan. The general rule is to compare the savings from a lower rate against the closing costs of refinancing and your expected time in the property. Use this calculator to model the new loan, then compare its total interest figure with the remaining interest on your current loan. If the new total plus refinancing costs is lower, refinancing usually pays off. If you plan to sell soon, the math is more conservative because you may not stay long enough to recover the closing costs.