How to Use the Loan Payment Calculator
This calculator estimates the monthly payment, total interest, and total amount paid for a fixed-rate installment loan. It can be used for personal loans, bank loans, equipment loans, and other loans that are repaid with regular monthly payments over a set period.
Enter the amount borrowed, the annual interest rate, and the loan term. You can enter the term using both years and additional months. The optional start date is used to estimate the first payment and payoff dates.
Understanding the Loan Amount and Interest Rate
The loan amount is the principal—the amount borrowed before future interest is added. For example, if you borrow $10,000, enter $10,000 even though the total amount repaid will be higher.
Enter the annual interest rate shown for the loan. The interest rate is not the same as the total percentage of the loan that you will pay in interest. Interest builds over time on the remaining balance, so the loan term and payment schedule affect the final cost.
Some lenders list both an interest rate and an APR. APR may include certain lender fees in addition to interest. If fees are included in the quoted APR, the calculator’s estimate may differ from the lender’s official payment schedule.
What the Results Mean
The monthly payment is the estimated amount required each month to repay the loan within the selected term. Each payment is divided between principal and interest.
At the beginning of the loan, a larger portion of each payment usually goes toward interest. As the balance decreases, more of each payment goes toward principal. This gradual repayment process is called amortization.
The total interest result estimates how much the loan will cost beyond the amount borrowed. The total amount paid combines the original principal and all estimated interest.
How Extra Monthly Payments Affect a Loan
The Extra Monthly Payment field lets you estimate what could happen if you pay more than the required amount each month. The calculator compares the original payment schedule with the faster payoff plan and shows:
The new estimated payoff time
The new payoff date
The amount of interest saved
The number of months saved
The total amount paid with the extra payments
For example, a $25,000 loan at 7.5% for five years has an estimated monthly payment of $500.95 and approximately $5,056.92 in total interest. Paying an additional $100 each month could reduce the payoff period from 60 months to 49 months and save approximately $1,013.61 in interest.
Check with the lender to make sure extra money is applied directly to principal. Also check whether the loan has a prepayment penalty.
Using the Amortization Schedule
The amortization schedule provides a monthly breakdown of the loan. For every payment, it shows:
Payment date
Payment amount
Principal paid
Interest paid
Remaining balance
The final payment may be slightly smaller than the regular monthly payment because only the remaining principal and interest are needed to bring the balance to zero.
What This Calculator Does Not Include
This calculator assumes a fixed interest rate and regular monthly payments. It does not include loan origination fees, late fees, payment-processing fees, changing interest rates, balloon payments, or other special loan terms.
It is not intended to estimate the complete cost of a mortgage or vehicle purchase. Property taxes, homeowners insurance, mortgage insurance, vehicle sales tax, trade-in value, registration fees, and similar costs require more specialized calculators.
Frequently Asked Questions
Does paying a loan off early reduce the total interest?
Usually, yes. With a standard amortized loan, paying additional principal lowers the balance used to calculate future interest. The exact savings depend on the rate, remaining balance, and when the extra payments are made.
Is APR the same as total interest paid?
No. APR is an annual percentage used to describe the borrowing cost. Total interest is the dollar amount paid over the entire loan. A 7.5% annual rate does not mean the total interest will equal 7.5% of the original loan amount.
Does the start date change the monthly payment?
In this calculator, the start date is used only to estimate payment dates and the payoff date. It does not change the calculated monthly payment.
Can I use this for a zero-interest loan?
Yes. Enter 0% as the annual interest rate. The loan amount will be divided evenly across the selected number of monthly payments.
Why might my lender’s figures be different?
Lenders may use daily interest, different rounding rules, fees, or a different first-payment period. Use this calculator as an estimate and compare the result with the lender’s official loan documents before making a financial decision.