A loan can help you buy a car, consolidate debt, cover a home project, or handle an unexpected expense. Before you sign, you should know exactly what it will cost each month and over its full life. Our free loan calculator shows your estimated monthly payment, total interest, and total repayment in seconds, so you can compare offers with confidence.
How to Use the Loan Calculator
- Enter the loan amount: The total amount you plan to borrow (the principal).
- Enter the interest rate: The annual interest rate (APR) offered by the lender.
- Choose the loan term: The number of months or years you will take to repay the loan.
- Review the results: See your monthly payment, total interest, and total amount paid.
Try a few different terms and rates. Small changes can shift your total cost by hundreds or even thousands of dollars.
Loan Payment Formula
For a standard fixed-rate loan, the monthly payment is calculated with this formula:
M = P × r × (1 + r)n / ((1 + r)n − 1)
- M: Monthly payment
- P: Loan amount (principal)
- r: Monthly interest rate (annual rate divided by 12)
- n: Total number of monthly payments
Total interest is simply your monthly payment multiplied by the number of payments, minus the original loan amount.
Loan Calculation Example
Suppose you borrow $20,000 at 7% APR for 5 years (60 months):
| Item | Amount |
|---|---|
| Loan amount | $20,000 |
| Monthly payment | About $396 |
| Total of 60 payments | About $23,761 |
| Total interest paid | About $3,761 |
If you stretch the same loan to 7 years, your monthly payment drops, but you pay noticeably more interest overall.
Types of Loans You Can Calculate
- Personal loans: Usually unsecured, with fixed rates and terms of 1 to 7 years.
- Auto loans: Secured by the vehicle, typically 3 to 7 years.
- Student loans: Federal or private loans for education, often with longer repayment periods.
- Home improvement loans: Used for repairs and renovations, either secured or unsecured.
- Debt consolidation loans: Combine several debts into one payment, ideally at a lower rate.
What Affects Your Loan Cost?
Interest rate
The rate is the biggest driver of cost. Even a one-point difference can add up to a large amount over several years.
Loan term
Longer terms lower your monthly payment but increase total interest. Shorter terms cost more per month but save money overall.
Credit score
Borrowers with higher credit scores usually qualify for lower rates, which reduces both the monthly payment and total interest.
Fees
Origination fees, application fees, and prepayment penalties can raise the real cost of a loan. Always compare the APR, not just the interest rate.
How to Lower the Cost of a Loan
- Improve your credit score: Pay bills on time and reduce credit card balances before applying.
- Compare lenders: Check banks, credit unions, and online lenders, since rates can differ a lot.
- Choose a shorter term: If your budget allows, you will pay less interest overall.
- Make a larger down payment: Borrowing less reduces both your payment and your interest.
- Pay extra when possible: Extra payments go toward principal and can shorten the loan, if there is no prepayment penalty.
Loan Calculator Limitations
This calculator assumes a fixed interest rate and equal monthly payments. It does not include origination fees, insurance, taxes, or variable-rate changes. Your lender's actual terms may differ, so use the result as a planning estimate and confirm details in your loan agreement.
Frequently Asked Questions
How do I calculate my monthly loan payment?
Enter the loan amount, annual interest rate, and term into the calculator. It applies the standard amortization formula to give you the monthly payment, total interest, and total repayment.
What is the difference between interest rate and APR?
The interest rate is the cost of borrowing the principal. APR also includes certain fees, so it reflects the true yearly cost of the loan and is better for comparing offers.
Is a shorter or longer loan term better?
A shorter term saves interest but has higher monthly payments. A longer term is easier on your monthly budget but costs more in total. Choose the shortest term you can comfortably afford.
Can I pay off a loan early?
Usually yes, and it can save interest. Some lenders charge a prepayment penalty, so check your loan agreement before making large extra payments.
Does this loan calculator work for car loans and personal loans?
Yes. It works for any fixed-rate installment loan, including personal, auto, student, and home improvement loans.