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Almost every big purchase in the United States is paid for in monthly installments — a house, a car, a college degree, even a kitchen remodel. The question that decides whether any of those purchases is affordable is simple: how much will I have to pay every month, and for how long? This free payment calculator answers both. Enter the loan amount, the annual interest rate, and the term in years, and it shows your monthly payment, the total you will pay over the life of the loan, the total interest, and a year-by-year schedule of how the balance falls to zero.
How to Use This Payment Calculator
Start with the loan amount — the full sum you are borrowing, before interest. Then enter the annual interest rate as a percentage: 6 means 6% per year. Finally, enter the loan term in years. Common terms are 15 and 30 years for a mortgage, 3 to 7 years for a car loan, and 5 to 10 years for a personal loan. Press Calculate and the result panel shows your monthly payment first, then the total of all payments and the total interest. Below that, the amortization schedule breaks every year down into the interest paid, the principal paid, and the balance left at year end, so you can see exactly when the balance starts falling fast.
If your rate is 0%, there is no interest to add, so the payment is simply the loan amount divided by the number of months. In short, a payment calculator turns a loan amount, an interest rate, and a term into a monthly payment and a payoff schedule — and this one also shows the total cost, so you can judge the loan by what it really costs you, not just by the monthly figure.
What Is a Loan Payment?
A loan is a contract in which a lender gives you money now and you promise to pay it back, with interest, in regular installments. Each monthly payment does two jobs at once: part of it covers that month’s interest, and the rest reduces the amount you still owe, which is called the principal. Early on, the balance is at its largest, so interest takes the bigger share of every payment. As the balance shrinks, the interest share falls and the principal share grows — while the payment itself stays exactly the same every month on a fixed-rate loan. That slow shift is called amortization, and it is why the first years of a long loan feel like so little progress: most of the early money is going to interest, not to the balance.
Loans come in many shapes, but the payment math is the same for all of them: mortgages, auto loans, student loans, and personal loans all use this fixed monthly payment. What changes is the amount, the rate, and the term — and those three numbers decide everything else.
The Payment Formula
The monthly payment uses the standard amortizing-loan formula: monthly payment = P × r × (1 + r)n ÷ ((1 + r)n − 1), where P is the loan amount, r is the monthly rate — the annual rate divided by 12 and then by 100 — and n is the number of monthly payments. With a 15-year term, n is 180; with a 30-year term, n is 360.
The formula looks heavy, but it has a simple meaning: the payment is sized so that if you pay it every month for n months, the loan is exactly paid off — the last payment brings the balance to zero. The total of all payments is the monthly payment multiplied by n, and the total interest is that total minus the loan amount. Change any one input and the result moves: a higher rate or a longer term raises the total interest, while a larger loan raises both the payment and the interest. That is why comparing loans means comparing all three numbers together, never the monthly payment alone.
Worked Example: A $200,000 Loan at 6% for 15 Years
Take a loan of $200,000 at 6% annual interest over 15 years. The monthly rate is 0.005, and the number of payments is 180. The monthly payment works out to $1,687.71.
Over 180 months you will pay $1,687.71 × 180, which is $303,788.46 in total, so the total interest is $303,788.46 minus $200,000, or $103,788.46. The schedule shows the amortization clearly: in year 1 you pay $11,769.23 in interest and only $8,483.33 toward the principal, leaving a balance of $191,516.67 — after a full year of payments, less than 5% of the loan is gone. By year 15 the picture has flipped: the final year costs only $643.13 in interest and $19,609.43 goes to principal, bringing the balance to $0.00. That is the whole story of a fixed-rate loan in one table — slow at first, fast at the end.
Monthly Payment by Loan Amount (6%, 15 Years)
The table below shows the monthly payment for common loan amounts at a 6% annual rate over 15 years, before any taxes, fees, or insurance.
| Loan Amount | Monthly Payment |
|---|---|
| $100,000 | $843.86 |
| $150,000 | $1,265.79 |
| $200,000 | $1,687.71 |
| $250,000 | $2,109.64 |
| $300,000 | $2,531.57 |
The payment scales in direct proportion to the amount: every extra $50,000 borrowed adds about $421.93 a month at this rate and term. The rate matters just as much. On the same $200,000 loan over 15 years, raising the rate from 6% to 10% pushes the payment from $1,687.71 to $2,149.21 a month — and the total interest jumps from $103,788.46 to $186,857.84. A single percentage point is never small on a large loan.
Shorter Term or Lower Payment: Which Saves More?
The term is the biggest lever of all. On a $200,000 loan at 6%, a 15-year term costs $1,687.71 a month and $103,788.46 in total interest. Stretch the same loan to 30 years and the payment falls to $1,199.10 a month — nearly $489 less — but the total interest climbs to $231,676.38, more than double. The shorter term saves $127,887.92 in interest.
That trade-off is the central decision of any loan. A longer term buys a lower monthly payment and more breathing room in the budget, but you pay for it twice: in far more interest, and in years of extra payments. A shorter term costs more each month but ends the debt sooner and cheaper. If the monthly payment on the shorter term fits your budget, it is almost always the better deal — and if it does not fit, the honest answer is usually a smaller loan, not a longer one. For a home purchase, run the same numbers through our mortgage calculator to see how taxes and insurance change the picture, and for a car, our auto loan calculator adds the down payment and trade-in into the same math.
How to Lower Your Monthly Payment
The cleanest way to lower the payment is to borrow less: a bigger down payment, a cheaper car, or a smaller house all cut the loan amount directly, and every dollar off the principal also cuts the interest charged on it. The second lever is the rate. A better credit score earns a lower rate, so check your score and fix any errors on your report before you apply — and compare at least two or three lenders, because rates for the same borrower can differ by a full point or more.
Extra payments are a quiet third lever. Paying even $100 extra a month toward the principal shortens the loan and cuts total interest, because the extra money goes straight to the balance and every future month’s interest is charged on a smaller amount. Just confirm with your lender that extra payments are applied to principal and carry no prepayment penalty — most fixed-rate loans in the US have none, but it is worth checking before you send the money.
What This Calculator Does Not Cover
This tool estimates the loan payment itself: principal plus interest on a fixed rate. It does not include property taxes, homeowner’s insurance, private mortgage insurance, or lender fees, which can add hundreds a month to a real mortgage payment. It also assumes the rate never changes, so it does not apply to adjustable-rate loans, where the payment moves when the rate moves, or to credit cards, where the balance and the minimum payment change every month.
Run your numbers above, try a shorter term against a longer one, and you will know the true monthly cost — and the true total cost — before you sign anything.