How much interest will you pay on a loan?

A payment that fits can still be an expensive loan

Lenders lead with the payment because that is what people compare in a week. Interest is the part of each payment that does not reduce what you owe, and on a long fixed loan it adds up to a second sum beside the amount you borrowed. Stretching the term makes the payment smaller and, at the same rate, raises the interest you pay if you hold the loan to the end.

The loan calculator on this site walks through one case: the same $25,000 at 7% costs $495.03 a month over 5 years, and a 3-year loan on that amount has a higher payment and less interest overall. Your rate and your amount will differ. The shape is the point. Read Total interest for each term before you pick the longest one because the payment looks comfortable.

That schedule assumes a fixed rate and equal payments. A variable rate will not follow it. Fees, insurance, and taxes the lender charges are outside that calculator. Two offers with the same rate can still cost different amounts once those fees are in the yearly figure.

Interest first, then extra payments, then the fees

Put the amount, the rate, and the term into the Loan Calculator. It shows the payment, total interest, the balance over time, and a full amortization schedule. Biweekly and weekly options there divide the yearly rate by 26 or 52. Some lenders compute interest daily, and the payment can differ by a few cents from that shortcut.

If the loan is a mortgage and you are thinking about paying more than the minimum, switch to the Mortgage Payoff Calculator. It compares the loan with and without extra payments, month by month, and shows how much interest and time those extras remove. An extra payment helps only if you can keep making it. The calculator does not know whether that cash was your emergency fund.

When the offer includes upfront fees, run the APR Calculator. It finds a yearly cost that counts those fees, sets that APR next to the stated rate, and shows the monthly payment and total cost. The rate is the price of borrowing inside the schedule. The APR is the rate plus the effect of charges you pay to get the loan. Use it when you are comparing two offers, not as a replacement for the payment you will actually send each month.

These three figures answer different questions. The loan schedule says what this fixed loan costs if nothing changes. The payoff view says what happens if you add money. The APR says whether the quoted rate left fees out. None of them is a promise from a lender, and none of them is advice to borrow.