Free Loan Calculator

This loan calculator helps you determine the monthly payment, total cost, and payoff timeline for any type of fixed-rate loan, whether it is a personal loan, auto loan, home equity loan, or any other installment loan. Follow these steps to get accurate results and understand the true cost of borrowing.

1. Enter the loan amount. This is the total amount you plan to borrow. It could be the purchase price of a car, the balance you want to consolidate, or any other sum you need to finance. Keep in mind that some lenders deduct origination fees from the disbursement, so the amount you actually receive may be slightly less than what you borrow.
2. Set the interest rate. Enter the annual interest rate offered by your lender. If you are shopping for a loan, try entering rates from several lenders to compare the total cost. Rates vary significantly based on your credit score, the loan type, and current market conditions. Even a difference of half a percentage point can save or cost you hundreds of dollars over the life of a loan.
3. Choose the loan term. Select how many years you want to take to repay the loan. Shorter terms result in higher monthly payments but less total interest, while longer terms lower your monthly payment but increase the total cost. Use the calculator to experiment with different terms and find the right balance between affordability and total interest.
4. Add extra monthly payments (optional). If you plan to pay more than the minimum each month, enter the extra amount here. The calculator will show you exactly how much interest you save and how many months you cut off the loan. Even small extra payments of $25 to $50 per month can make a meaningful difference over a multi-year loan.
5. Review your results. The summary shows your monthly payment, total cost, total interest, and payoff date. If you entered extra payments, you will also see a comparison showing your interest savings and time saved. The amortization schedule breaks down every payment into principal and interest, and the charts visualize how your balance decreases over time.

The Amortization Formula Explained

Most fixed-rate loans use a process called amortization to determine your monthly payment. The word "amortization" comes from the Latin "amort," meaning "to kill" — you are gradually killing off the debt with each payment. The standard formula is M = P[r(1+r)^n] / [(1+r)^n - 1], where M is the monthly payment, P is the principal (the amount you borrow), r is the monthly interest rate (the annual rate divided by 12), and n is the total number of payments.

Let us walk through a concrete example. Suppose you borrow $25,000 at a 7.5% annual interest rate for 5 years. The monthly rate is 7.5% / 12 = 0.625%, or 0.00625 as a decimal. The total number of payments is 5 x 12 = 60. Plugging these into the formula: M = 25,000 x [0.00625 x (1.00625)^60] / [(1.00625)^60 - 1]. Working through the math, (1.00625)^60 = 1.4533, so M = 25,000 x [0.00625 x 1.4533] / [1.4533 - 1] = 25,000 x 0.009083 / 0.4533 = 25,000 x 0.02003 = $500.68 per month.

How Principal and Interest Shift Over Time

One of the most important things to understand about amortized loans is how the breakdown between principal and interest changes with each payment. In the first month of our $25,000 example, the interest charge is $25,000 x 0.00625 = $156.25. Since the total payment is $500.68, only $344.43 goes toward principal, reducing the balance to $24,655.57. In month two, interest is calculated on the lower balance: $24,655.57 x 0.00625 = $154.10, so $346.58 goes to principal. By the final months, almost the entire payment goes to principal because the remaining balance is so small.

This front-loaded interest structure is why extra payments early in the loan have such a dramatic impact. Each dollar you pay toward principal in the first year saves you from paying interest on that dollar for the remaining four years. The same extra dollar in year four only saves you interest for a few months. If you are going to make extra payments, start as early as possible to maximize the compounding savings effect.

Total Cost of Borrowing

The total cost of a loan is the sum of all your payments over the life of the loan. In our $25,000 example at 7.5% for 5 years, the monthly payment of $500.68 multiplied by 60 payments equals $30,040.80 in total payments. Since you borrowed $25,000, the total interest paid is $5,040.80 — about 20% of the original loan amount. Understanding total cost helps you make informed decisions. A lower monthly payment from a longer term might seem attractive, but extending that same $25,000 loan to 7 years at the same rate increases total interest to $7,230, an increase of over $2,000. Always consider total cost, not just the monthly payment.

Secured vs Unsecured Loans

Loans fall into two broad categories: secured and unsecured. A secured loan is backed by collateral — an asset the lender can seize if you default. Mortgages (secured by the home), auto loans (secured by the vehicle), and home equity loans (secured by your home equity) are all examples. Because the lender has collateral reducing their risk, secured loans typically offer lower interest rates, often 3-8% for borrowers with good credit.

Unsecured loans require no collateral and are approved based entirely on your creditworthiness, income, and debt-to-income ratio. Personal loans, student loans, and credit card balances are common examples. Since the lender takes on more risk with no asset to recover, unsecured loans carry higher interest rates, typically 6-36% depending on your credit profile. The trade-off is convenience — unsecured loans are usually faster to obtain and do not put any of your assets at risk.

Fixed-Rate vs Variable-Rate Loans

Fixed-rate loans lock in your interest rate for the entire loan term. Your monthly payment never changes, making budgeting straightforward and protecting you from interest rate increases. The vast majority of personal loans, auto loans, and conventional mortgages are fixed-rate. This calculator assumes a fixed-rate structure.

Variable-rate loans (also called adjustable-rate) have an interest rate that can change periodically, usually tied to a benchmark index like the prime rate or SOFR (Secured Overnight Financing Rate). These loans often start with a lower "teaser" rate that is below comparable fixed rates, but the rate can increase over time. Adjustable-rate mortgages (ARMs), some student loans, and home equity lines of credit (HELOCs) commonly use variable rates. Variable rates make sense if you plan to pay off the loan quickly or if you expect rates to remain stable or decrease.

Installment vs Revolving Credit

Installment loans give you a fixed lump sum that you repay in equal monthly payments over a set term. Once you pay off the loan, the account is closed. Personal loans, auto loans, mortgages, and student loans are all installment loans. This calculator is designed for installment loans.

Revolving credit gives you a credit limit that you can borrow against, repay, and borrow again repeatedly. Credit cards and home equity lines of credit (HELOCs) are revolving credit. There is no fixed repayment schedule — you can pay any amount above the minimum each month and borrow more up to your limit. Revolving credit offers flexibility but typically carries higher interest rates and makes it easier to stay in debt indefinitely if you only make minimum payments.

The terms you receive on a loan — the interest rate, fees, and repayment period — can vary dramatically based on your preparation and shopping strategy. Here are proven strategies to secure the best deal.

Improve Your Credit Score Before Applying

Your credit score is the single biggest factor affecting your interest rate. Before applying for a loan, check your credit reports from all three bureaus (Experian, Equifax, and TransUnion) at AnnualCreditReport.com and dispute any errors. Pay down credit card balances to below 30% of their limits, as credit utilization is the second-largest factor in your score. Avoid opening new credit accounts in the months before applying, and make sure all existing payments are current. Even a 20-40 point improvement can drop your rate by a full percentage point or more.

Shop Multiple Lenders

Never accept the first loan offer you receive. Interest rates can vary by 2-5 percentage points between lenders for the same borrower. Check rates at online lenders, your bank, and at least one credit union. Most lenders now offer pre-qualification with a soft credit pull that does not affect your score, so there is no downside to shopping around. If you submit all your applications within a 14-day window, credit scoring models treat them as a single inquiry, minimizing any impact on your credit score.

Choose the Right Loan Term

Resist the temptation to automatically choose the longest term for the lowest monthly payment. While affordability matters, a longer term means more total interest. Run the numbers using this calculator for multiple term lengths. A good strategy is to choose the shortest term where the monthly payment is still comfortable within your budget. If you are unsure, choose a longer term but commit to making extra payments — this gives you the flexibility of a low required payment with the option to pay it off faster when cash flow allows.

Understand All Fees

Interest rate is not the only cost. Origination fees (1-8% of the loan amount), application fees, prepayment penalties, and late fees can all increase the true cost of your loan. Ask every lender for the APR, which includes fees in addition to the interest rate, and compare APRs rather than advertised rates. Pay special attention to prepayment penalties if you might pay off the loan early. Some lenders charge a fee equal to several months of interest if you pay off the balance before a certain date, which can negate the savings of an early payoff or refinance.

Consider a Co-Signer

If your credit score is not strong enough to qualify for a competitive rate, a co-signer with good credit can help you get approved at a lower rate. The co-signer agrees to repay the loan if you cannot, so lenders treat the application as if it has the co-signer's credit profile. Just remember that both the borrower and co-signer are legally responsible for the debt, and missed payments will damage both credit scores. Some lenders offer co-signer release after 12-24 months of on-time payments.