Calculate your estimated loan payments, total interest, and total repayment amount using our free online loan calculator. Adjust the loan amount, interest rate, term, and payment frequency to see how different loan scenarios affect your payments.
Loan Calculator
FinanceCalculatr — Loan Calculator
Estimate your monthly loan payment
This calculator provides estimates based on the information you enter. Actual loan payments and costs may vary depending on lender terms, fees, taxes, interest-rate changes, payment schedules, and other factors. This tool is for informational and educational purposes only and is not financial, investment, tax, or lending advice.
What Is a Loan Calculator?
A loan calculator is a tool that turns the core details of any loan — the amount borrowed, the interest rate, and the repayment term — into a concrete monthly loan payment you can plan around. Instead of working through the math by hand, this loan calculator instantly shows your estimated payment, total interest, and total repayment amount so you can compare loan scenarios before you borrow.
How Does a Loan Calculator Work?
Underneath the interface, a loan calculator applies the standard loan amortization formula. The main inputs are the loan principal (amount borrowed), the annual interest rate, the loan term, how often you make payments, and how often interest compounds. Change any one of these and your monthly loan payment, total interest, and payoff date all shift in response — which is why it’s worth testing a few realistic scenarios rather than relying on a single result.
How Is a Loan Payment Calculated?
This loan payment calculator uses the standard amortizing loan formula below. It spreads your loan principal and total interest into equal periodic payments, so every payment covers a little less interest and a little more principal than the one before it.
How Interest Rates Affect Loan Payments
The interest rate has an outsized effect on the cost of a loan because it’s charged on the remaining balance every period, not just once. A higher interest rate increases both your periodic payment and the total interest paid over the life of the loan — even a difference of one or two percentage points can add up to a meaningful amount on a larger loan or a longer term. Use the “Compare Loan Rates” panel above to see this side by side for your own numbers.
How Loan Terms Affect Total Interest
Loan term is a trade-off between monthly affordability and total cost. A longer term spreads the same principal over more payments, which generally lowers each individual payment — but it also means interest accrues for longer, so total interest paid over the life of the loan is usually higher. A shorter term raises the periodic payment but reduces total interest, since the balance is paid down faster.
How Extra Payments Can Save Interest
Extra payments go directly toward your loan principal, which reduces the balance that future interest is calculated on. Because of this, even modest recurring extra payments — or a single one-time extra payment early in the loan — can shorten your loan term and reduce total interest, without changing your regular scheduled payment. Enter an extra payment amount in the calculator above to see your new payoff date and total interest saved.
How to Use This Loan Calculator
- Enter the loan amount.
This is your loan principal — the total amount you plan to borrow, before interest.
- Enter the annual interest rate.
Use the rate your lender has quoted, as a percentage.
- Select the loan term.
Choose how long you’ll take to repay the loan, in years or months.
- Select the payment frequency.
Choose monthly, biweekly, or weekly payments to match your loan.
- Add optional extra payments, if applicable.
Enter a recurring extra amount or a one-time extra payment to see the effect on your payoff date.
- Select Calculate.
The loan calculator instantly shows your payment, total interest, and full amortization schedule.
- Review your results.
Check the payment amount, total interest, compare loan rates, and browse the amortization schedule before you decide.
Loan Calculator FAQs
What is a loan calculator?
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A loan calculator is a tool for estimating your loan payment, total interest, and total repayment amount based on the loan amount, interest rate, term, and payment frequency you enter.
How is a monthly loan payment calculated?
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Your monthly loan payment is calculated using the loan amortization formula, which factors in the loan principal, the periodic interest rate, and the total number of payments over the loan term.
How does the interest rate affect my loan payment?
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A higher interest rate increases both your periodic payment and the total interest paid over the life of the loan, since interest is charged on the remaining balance every period.
Is a longer loan term cheaper?
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A longer term usually lowers your periodic payment, but it generally increases total interest paid, because interest accrues over more payments. A shorter term raises the payment but reduces total interest.
Can I calculate total loan interest?
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Yes. Once you calculate your loan, the results panel shows total interest alongside your periodic payment, total payments, and principal.
Can I add extra payments to the calculation?
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Yes. Use the “Add extra payments” option to enter a recurring extra amount per period or a one-time extra payment, and see the updated payoff date and interest saved in the Extra Payment Impact section.
What is an amortization schedule?
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An amortization schedule breaks down every payment over the life of the loan, showing how much goes toward principal, how much goes toward interest, and your remaining balance after each payment.
Does this loan calculator include compound interest?
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Yes. You can set a compounding frequency (monthly, quarterly, semi-annually, or annually), and the calculator converts it to a periodic rate that matches your chosen payment frequency.
Can I use this calculator for personal loans?
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Yes. This calculator works for personal loans, auto loans, and other fixed-rate, fully amortizing loans. It doesn’t include lender fees or variable-rate changes, so treat results as an estimate.
How accurate are loan calculator results?
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Results are mathematically accurate for the inputs provided, but they are estimates — actual loan terms can differ due to lender fees, taxes, rate changes, and other factors this tool does not model.