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Finance Tools

Loan Payment Calculator

Calculate your exact monthly loan payment, total interest paid, and full amortization schedule for any loan — instantly and free.

Loan Details

Monthly Payment

$500.95

Total Interest Paid

$5,056.92

Total Amount Paid

$30,056.92

Payoff Date

June 2031

Amortization Schedule

#PaymentPrincipalInterestBalance
1$500.95$344.70$156.25$24,655.30
2$500.95$346.85$154.10$24,308.45
3$500.95$349.02$151.93$23,959.43
4$500.95$351.20$149.75$23,608.22
5$500.95$353.40$147.55$23,254.83
6$500.95$355.61$145.34$22,899.22
7$500.95$357.83$143.12$22,541.39
8$500.95$360.07$140.88$22,181.33
9$500.95$362.32$138.63$21,819.01
10$500.95$364.58$136.37$21,454.43
11$500.95$366.86$134.09$21,087.57
12$500.95$369.15$131.80$20,718.42

How Loan Payments Are Calculated

Every loan payment you make consists of two parts: principal (the amount you borrowed) and interest(the lender's fee for providing the loan). In a standard amortizing loan, the monthly payment stays the same every month — but the split between principal and interest changes.

In the early months, most of each payment goes toward interest because your balance is high. Over time, as you pay down the principal, less interest accrues each month and more of each payment reduces the balance. This is called amortization.

The formula used is: M = P × [r(1+r)ⁿ] / [(1+r)ⁿ−1] — where P = loan amount, r = monthly interest rate, n = total number of payments.

What Affects Your Monthly Payment

Three factors directly control your monthly payment: the loan amount, the interest rate, and the loan term. A longer term (more months) means lower monthly payments but significantly more total interest paid. A lower interest rate reduces both your monthly payment and total cost.

For a $25,000 loan at 7.5% over 5 years, the monthly payment is approximately $500.76. Extending to 7 years drops the monthly payment to about $377 — but you pay roughly $6,700 more in total interest.

Loan Calculator FAQs

How is a loan payment calculated?
Monthly loan payments are calculated using the standard amortization formula: M = P × [r(1+r)ⁿ] / [(1+r)ⁿ−1], where P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments. This formula ensures that each payment covers both interest for that month and a portion of the principal.
What is amortization?
Amortization is the process of paying off a loan in fixed installments over time. Early payments are mostly interest, while later payments go primarily toward the principal. An amortization schedule shows exactly how much of each payment goes to interest vs. principal each month.
How can I lower my monthly payment?
You can lower monthly payments by: (1) extending the loan term, (2) making a larger down payment to reduce the principal, (3) finding a lower interest rate through better credit or shopping lenders, or (4) making extra payments to reduce principal faster.
Does paying extra reduce total interest?
Yes — paying extra reduces your principal balance faster, which in turn reduces the amount of interest calculated each month. Even small extra payments can save thousands in interest over the life of a loan and shorten the payoff period.
What's the difference between APR and interest rate?
The interest rate is the basic cost of borrowing the principal, expressed as a percentage per year. APR (Annual Percentage Rate) is broader — it includes the interest rate plus other fees like origination fees and closing costs. APR gives a more complete picture of the true cost of a loan.
Is this calculator accurate for any loan type?
This calculator uses standard amortization and is accurate for most personal loans, auto loans, and fixed-rate mortgages. It may not account for variable rates, balloon payments, or fees that some lenders charge. Always verify with your lender for exact figures.

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