Simple Payment Calculator
Shopping for a loan without knowing the monthly payment is like signing a lease without reading the rent. This loan payment calculator turns any loan amount, interest rate and term into the exact payment for the frequency you choose (monthly, biweekly, weekly or annual), the total you will repay, and the total interest you will pay, using the same amortization formula lenders use.
Quick Answer
A $25,000 loan at 6.5% annual interest over 5 years costs $489.15 per month. You repay $29,349.22 in total, which means $4,349.22 of pure interest, about 14.8% of everything you pay. The calculator is pre-filled with this exact case.
Key takeaways
- The monthly payment is fixed, but what it buys changes: early payments are mostly interest, late payments are mostly principal.
- Total interest is always less than principal times rate times years on an amortizing loan, because interest is charged on the shrinking balance, not the original amount.
- Stretching the term lowers the payment but raises the total cost. On $25,000 at 6.5%, 7 years costs $1,834.60 more in interest than 5 years.
- Compare APR, not just the interest rate, when lenders compete. APR folds fees into the yearly rate, so it is the honest comparison number.
$489.15
Monthly payment on $25,000 at 6.5% for 5 years
$4,349.22
Total interest, well under the $8,125 a flat-rate quote would charge
$135.42
Interest inside the very first payment; the last payment holds only $2.64
- Quick Answer
- How to use the loan payment calculator
- The monthly payment formula, and where each dollar goes
- Worked example: what the term does to the total cost
- Interest rate vs APR: the comparison that actually matters
- What competing loan calculators get wrong
- Frequently asked questions
- Add This Calculator to Your Website
- References
How to use the loan payment calculator
Enter three numbers, pick a payment frequency, and click Calculate. The result box stays hidden until you do, so nothing on the page pretends to know your loan before you describe it.
- Loan amount: the sum you are borrowing, for example 25000 for a $25,000 car loan. Leave out any down payment or fees you pay in cash, since the tool only prices the financed amount.
- Annual interest rate: the lender's yearly rate as a plain number, for example 6.5. This is the interest rate, not the APR; the section below explains why that distinction matters when you compare offers.
- Loan term in years: the repayment period, for example 5. On the monthly setting the tool converts it to 60 monthly payments behind the scenes; biweekly, weekly and annual settings convert the same term to 130, 260 or 5 payments instead.
- Payment frequency: how often a payment is due: monthly (12 payments a year), biweekly (26), weekly (52) or annual (1). The tool divides the annual rate by that number and sizes each payment for its own period.
- Read the three outputs: the payment for your selected frequency in large type (the label above it names the frequency), then total repayment and total interest underneath. Use Copy my results to keep the full scenario with its assumptions in one sentence.
- Compare offers: run each lender's rate and term through the tool. A lower payment with a longer term can quietly cost thousands more, which the term table in the worked example makes visible.
The monthly payment formula, and where each dollar goes
Lenders size a fixed loan payment with the amortization formula: payment equals principal times r(1+r)^n divided by (1+r)^n minus 1, where r is the per-period interest rate (the annual rate divided by the payments per year for the frequency you pick) and n is the total number of payments (the term in years times the payments per year). The Consumer Financial Protection Bureau notes that lenders use a standard formula that apportions just the right amount to interest and principal so the loan pays off precisely at the end of the term.
The payment never changes, but its makeup does. Each payment period, the lender first takes interest on the balance you still owe, and whatever is left reduces the principal. Because the balance shrinks, the interest slice shrinks with it. That is amortization, and it is why the same $489.15 buys very different things at the start and the end of a loan:
Payment 1
$135.42 interest
$353.74 principal
Balance is at its highest, so interest takes the biggest bite.
Payment 30 (midpoint)
$75.42 interest
$413.73 principal
Halfway through, most of the payment finally attacks the balance.
Payment 60 (last)
$2.64 interest
$486.52 principal
Almost the entire payment retires principal.
Each split is rounded to the cent, so the interest and principal parts can total a cent above or below the $489.15 payment. The rounding never changes what you actually pay.
At 0% interest the formula has no rate to work with, so the tool falls back to simple division: principal divided by the number of payments. A $12,000 interest-free loan over 4 years is exactly $250.00 a month.
Worked example: what the term does to the total cost
Take the pre-filled case: $25,000 borrowed at 6.5% annual interest, repaid over 5 years (60 payments). The monthly rate is 0.065 divided by 12, or 0.5417%. Plugging into the formula gives a monthly payment of $489.15. Sixty payments total $29,349.22, so the interest bill is $29,349.22 minus $25,000, which is $4,349.22. Every number in this paragraph is exactly what the calculator shows.
The term is the lever most borrowers underestimate. The same loan at the same rate, stretched or shortened, trades monthly comfort against total cost:
| Term | Monthly payment | Total repaid | Total interest |
|---|---|---|---|
| 3 years | $766.23 | $27,584.10 | $2,584.10 |
| 5 years | $489.15 | $29,349.22 | $4,349.22 |
| 7 years | $371.24 | $31,183.82 | $6,183.82 |
Dropping from 5 years to 3 raises the payment by $277.08 a month but saves $1,765.12 in interest. Stretching to 7 years cuts the payment by $117.91 yet adds $1,834.60 in interest. If you want the payment-by-payment story this page skips, the amortization schedule calculator lists every one of the 60 payments with its interest and principal split.
Interest rate vs APR: the comparison that actually matters
The interest rate is the price of the borrowed money alone. The APR, the annual percentage rate, folds lender fees and charges into one yearly rate. The Federal Reserve's consumer glossary defines APR as the cost of credit expressed as a yearly rate, including the interest rate plus points, broker fees and certain other charges, and the FTC reminds borrowers that the APR is the cost of credit expressed as a yearly rate when judging dealer financing offers.
That makes APR the honest comparison number. Two lenders can quote the same 6.5% interest rate while charging very different fees, and the APR exposes the gap. The federal Truth in Lending Act requires lenders to disclose the APR before you are obligated, precisely so you can compare APR to APR. One caution: this calculator prices the interest rate you enter, not the APR. If a lender's APR is 7.1% while the note rate is 6.5%, run the tool at 7.1% to see the true cost of that offer. Student borrowers comparing federal offers can start from the official loan types on Federal Student Aid, and the average student loan payment calculator shows what typical balances cost per month.
What competing loan calculators get wrong
Most loan payment tools give you the monthly number and stop. The ones worth beating add context the number alone cannot carry, and a few actively mislead. Here is what we found testing the top results, and what this page does instead.
Reducing balance: what this tool computes
Interest is charged each month on the balance you still owe. Pay down principal and next month's interest falls. On $25,000 at 6.5% for 5 years the total interest is $4,349.22. This is how mainstream installment loans work.
Flat rate: the quote to watch out for
Some lenders quote a flat rate: interest charged on the original principal for the whole term, as principal times rate times years. That is $8,125 on the same loan, $3,775.78 more, nearly double. If a quote never mentions the balance shrinking, ask which method it uses.
- Total interest without the term trade-off: several top tools show total interest but never show what two extra years cost. The term table above exists because that comparison is the actual decision.
- Formula pages with no worked verification: formula explainers are common, but few tie each number back to a tool you can re-run. Every figure on this page reproduces in the calculator above.
- Extra payments ignored: the fastest way to cut interest is paying more than the minimum, and most basic tools cannot model it. This tool prices the scheduled payment honestly; to see what extra payments do, use the loan additional payment calculator, which is built for exactly that question.
- Mortgages treated like car loans: a home loan payment also carries property tax, insurance and possibly PMI on top of principal and interest. For houses, use the dedicated mortgage payment calculator instead of this one.
One honest limitation: this tool assumes fixed payments at the frequency you select and a fixed rate for the whole term. It does not handle adjustable rates, interest-only periods or balloon payments. The CFPB warns that some loans do not fully amortize and can leave a large lump sum due at the end, so confirm your loan amortizes fully before trusting any payment estimate.
Frequently asked questions
The standard amortization formula is: payment = P × r(1+r)^n ÷ ((1+r)^n − 1). P is the loan amount, r is the per-period interest rate (the annual rate divided by the payments per year: 12 for monthly, 26 for biweekly, 52 for weekly, 1 for annual), and n is the total number of payments (years times the payments per year). For $25,000 at 6.5% over 5 years: r = 0.0054167, n = 60, and the payment works out to $489.15.
Because an amortizing loan charges interest on the shrinking balance, not the original principal. Principal × rate × years ($25,000 × 6.5% × 5 = $8,125) is the flat-rate method, which ignores every payment you have already made. The true amortized interest on that loan is $4,349.22, almost half. Any page that presents the simple multiplication as the interest formula for a standard loan is describing a different, more expensive loan type.
The interest rate prices the borrowed money alone; the APR folds lender fees and charges into one yearly rate. The CFPB and the Federal Reserve both define APR as the broader cost-of-credit measure, which is why the Truth in Lending Act requires lenders to disclose it. Always compare APR to APR, not rate to rate. This calculator prices the rate you type in, so enter the APR figure if you want the offer's true cost.
It saves money per month but costs money overall. On $25,000 at 6.5%, stretching from 5 years to 7 cuts the payment from $489.15 to $371.24 but adds $1,834.60 in total interest. Going the other way, a 3-year term raises the payment to $766.23 yet saves $1,765.12 in interest versus 5 years. Pick the shortest term whose payment fits your budget.
The calculator divides the principal evenly across the payments, since there is no interest to amortize. A $12,000 interest-free loan over 4 years is $250.00 a month, $12,000.00 total, $0.00 interest. Negative rates are rejected as invalid, because a lender paying you to borrow is not a loan this formula models.
This calculator models biweekly payments directly: pick Biweekly in the Payment frequency menu and it prices a full payment every two weeks, 26 payments a year, each sized with the per-period rate (the annual rate divided by 26) over the same term. On the pre-filled $25,000 loan at 6.5% over 5 years, that is $225.49 every two weeks, $29,313.13 repaid in total and $4,313.13 of interest, slightly less interest than the monthly schedule because the balance falls a little faster. That is different from the half-payment trick, where you send half a monthly payment every two weeks and quietly add one extra monthly payment a year; the selector here recomputes the payment for the biweekly schedule itself.
Yes, and they are the fastest lever you have. Every extra dollar toward principal shrinks the balance that next month's interest is charged on, which compounds in your favor over the remaining term. This tool prices the scheduled payment only; model the savings of paying more with the loan additional payment calculator.
Interest each month is charged on the balance you still owe, and the balance is highest at the start. On the $25,000 example, the first $489.15 payment contains $135.42 of interest and $353.74 of principal, while the final payment contains $2.64 of interest and $486.52 of principal. The payment stays fixed; only the split changes. The CFPB describes this same shift from interest-heavy to principal-heavy payments as amortization.
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References
- Consumer Financial Protection Bureau. How does paying down a mortgage work? Ask CFPB. Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Auto loan key terms: amortization and APR. Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Mortgage key terms: amortizing and non-amortizing loans. Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Regulation Z, 12 CFR 1026.18: content of disclosures, amortizing loan definition. Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Regulation Z interpretations: amortization statements for interest-only loans. Accessed October 23, 2026.
- Consumer Financial Protection Bureau. Payday lending rule interpretations: equal payments and amortization. Accessed October 23, 2026.
- Board of Governors of the Federal Reserve System. A Consumer's Guide to Mortgage Refinancings: Glossary (amortization, APR). Accessed October 23, 2026.
- Federal Trade Commission. Car dealer ads and promotions: know before you go. Consumer Advice. Accessed October 23, 2026.
- Federal Trade Commission. Paying your car loan: personal finance tips. Consumer Advice. Accessed October 23, 2026.
- U.S. Department of Education, Federal Student Aid. Types of federal student loans. Accessed October 23, 2026.