Loan Calculator
Use this free loan calculator to estimate your monthly payment on a personal, auto, student, or business loan. Enter your loan amount, term, interest rate, and compounding frequency to see your payment amount, total interest, and a full amortization schedule. Add extra monthly payments to see how much faster you can become debt-free.
What Is a Loan?
A loan is a contract between a borrower and a lender in which the borrower receives a sum of money, called the principal, and agrees to pay it back over time — usually with interest. Loans are one of the most common ways people and businesses finance large purchases, cover expenses, or manage cash flow, ranging from small personal loans to large business or mortgage loans.
How Loan Payments Are Calculated
Most consumer loans are amortized loans, meaning you repay them through fixed periodic payments until the balance reaches zero. Each payment is split between principal and interest, calculated using the standard loan payment formula:
M = P × [r(1+r)n] ÷ [(1+r)n − 1]
Where M is your monthly payment, P is the loan amount (principal), r is your periodic interest rate, and n is the total number of payments. Early in the loan, most of each payment goes toward interest; over time, more of each payment goes toward principal.
Types of Loan Structures
| Loan Type | How It's Repaid | Common Examples |
|---|---|---|
| Amortized Loan | Fixed payments made periodically until the loan is fully paid off | Mortgages, auto loans, personal loans, student loans |
| Deferred Payment Loan | Single lump sum of principal and interest paid at maturity | Short-term commercial loans, some balloon loans |
| Bond | Predetermined face value paid at maturity, often bought at a discount | Zero-coupon bonds, some corporate bonds |
This calculator focuses on the amortized loan structure, since it is by far the most common type used for everyday personal and business borrowing.
Secured vs. Unsecured Loans
| Secured Loan | Unsecured Loan | |
|---|---|---|
| Collateral required | Yes (e.g. home, car, savings) | No |
| Typical interest rate | Lower | Higher |
| Approval basis | Collateral value + creditworthiness | Credit score and income primarily |
| Risk to borrower | Collateral can be repossessed on default | No asset at direct risk, but credit score suffers |
| Examples | Mortgages, auto loans, secured personal loans | Credit cards, personal loans, student loans |
The Five C's of Credit
Lenders evaluating unsecured loan applications commonly rely on the "five C's of credit" to judge a borrower's creditworthiness:
- Character — your credit history, work experience, and track record of repaying debts.
- Capacity — your ability to repay, usually measured with a debt-to-income ratio.
- Capital — other assets you hold, such as savings or investments, that could help repay the loan.
- Collateral — for secured loans, the asset pledged as security in case of default.
- Conditions — the loan's purpose and current economic/lending climate.
Interest Rate: APR vs. APY
Interest is the cost of borrowing money, usually shown as a percentage of the loan amount. Loan interest is generally quoted as APR (Annual Percentage Rate), which includes the interest rate plus most lender fees, giving a fuller picture of the loan's true annual cost. Savings products, by contrast, are usually quoted with APY (Annual Percentage Yield), which accounts for compounding. Comparing loans by APR — not just the advertised interest rate — gives a more accurate comparison between lenders.
Compounding Frequency
Compound interest is interest calculated on both the original principal and the interest that has already accumulated. The more frequently interest compounds — daily, weekly, monthly, or annually — the more total interest accrues on the same nominal rate. Most consumer loans, including mortgages and auto loans, compound monthly. Use the compounding dropdown in the calculator above to see how this choice affects your results.
How Loan Term Affects Your Payment
A shorter loan term means higher monthly payments but significantly less total interest paid, since the balance is paid down faster and accrues interest for less time. A longer term lowers your monthly payment, improving cash flow, but increases the total interest cost over the life of the loan. There is no universally "correct" term — it depends on your monthly budget and how much total interest you're willing to pay for lower payments.
The Impact of Extra Payments
Because interest is front-loaded on amortized loans, extra payments made early in the loan term have an outsized effect on reducing total interest. Even a modest recurring extra payment can shorten your payoff timeline by months or years. Use the "Extra Monthly Payment" field above to model your own payoff strategy.
Tips for Getting a Better Loan
- Check and improve your credit score before applying — it's the biggest driver of your interest rate.
- Compare APR, not just advertised interest rate, across multiple lenders.
- Choose the shortest term you can comfortably afford to minimize total interest.
- Consider a secured loan or co-signer if you need a lower rate and have collateral available.
- Avoid taking on new debt or missing payments while your loan application is pending.
- Read the fine print for prepayment penalties or origination fees before signing.
Frequently Asked Questions
Q: What is the difference between APR and interest rate?
A: The interest rate is the cost of borrowing the principal, expressed as a percentage. APR includes the interest rate plus additional lender fees, giving a more complete picture of the loan's true annual cost.
Q: What is an amortized loan?
A: An amortized loan is repaid through fixed periodic payments that cover both principal and interest, with the interest portion decreasing and the principal portion increasing over time until the loan is fully paid off.
Q: What is the difference between a secured and unsecured loan?
A: A secured loan is backed by collateral, such as a home or car, which the lender can seize if you default. An unsecured loan has no collateral and relies on your creditworthiness, typically carrying a higher interest rate.
Q: How does compounding frequency affect my loan?
A: The more frequently interest compounds (daily, monthly, or annually), the more total interest accrues on the same nominal rate. Most consumer loans compound monthly.
Q: Can I pay off a loan early?
A: Most personal, auto, and standard loans allow early payoff without penalty, though some loans include prepayment penalty clauses. Always check your loan agreement before making large extra payments.
Q: How does my credit score affect my loan interest rate?
A: Lenders use your credit score as a key indicator of repayment risk. Higher credit scores generally qualify for lower interest rates, while lower scores result in higher rates or loan denial.
Q: What are the five C's of credit?
A: The five C's of credit are Character, Capacity, Capital, Collateral, and Conditions — the factors lenders evaluate to judge a borrower's creditworthiness for unsecured loans.
Q: Does a longer loan term always cost more?
A: A longer loan term reduces your monthly payment but increases the total interest paid over the life of the loan, since interest accrues for a longer period.
This calculator provides estimates for informational purposes only and does not constitute financial advice. Actual loan terms, rates, and costs vary by lender. Consult a licensed financial professional for guidance specific to your situation.