Loan Payment Calculator
About This Tool
Understanding the true cost of a loan before you commit is one of the most important financial decisions you can make. This calculator reveals the full picture behind any fixed-rate loan by computing your exact monthly payment, total interest over the life of the loan, and a complete month-by-month amortization schedule. It supports auto loans, personal loans, student loans, and home equity loans across more than 20 currencies. The amortization schedule is where the real insight lies. It shows how each payment is split between principal repayment and interest charges. In the early months of a loan, the vast majority of your payment goes toward interest because interest is calculated on your remaining balance, which is highest at the start. As you gradually reduce the principal, the interest portion shrinks and more of each payment chips away at what you actually owe. This front-loaded interest structure is why making extra payments early in a loan term has such a dramatic effect on total interest savings. The calculator also provides a visual breakdown chart showing the principal-to-interest ratio and a balance curve that tracks your declining debt over time. You can export the full amortization table to CSV for analysis in any spreadsheet application. Whether you are comparing offers from different lenders, evaluating the trade-off between a shorter term with higher payments or a longer term with lower payments, or simply trying to understand where your money goes each month, this tool gives you the data you need to make informed borrowing decisions. All calculations run entirely in your browser, so your financial data is never sent to any server.
How Loan Payments Work
When you take out a fixed-rate loan, your lender uses a process called amortization to structure your repayment. Amortization means spreading your debt across a series of equal monthly payments over the life of the loan. Each payment contains two components: principal repayment, which reduces the amount you originally borrowed, and interest, which is the lender's charge for lending you the money. Interest is calculated each month on your remaining balance. Because your balance is highest at the start of your loan, your first payments are heavily weighted toward interest. As you gradually pay down the principal, the interest portion shrinks and more of each payment reduces your balance. This creates the characteristic curve visible in the amortization chart: slow balance reduction early on, accelerating toward the end of the term. The relationship between loan term, interest rate, and monthly payment involves important trade-offs. A longer term lowers your monthly payment but increases total interest significantly. For example, extending a $25,000 auto loan from 4 years to 6 years at 6.5% reduces the monthly payment by about $120 but adds over $2,000 in total interest. Conversely, a shorter term means higher monthly payments but considerably less money paid to the lender overall. The interest rate itself reflects several factors: the lender's cost of funds, your credit risk profile, the loan type, and whether the loan is secured by collateral. Secured loans such as auto loans and home equity loans typically carry lower rates than unsecured personal loans, because the lender can recover the collateral if you default. Understanding these mechanics helps you evaluate loan offers, negotiate better terms, and decide how aggressively to pay down your debt.
How to Use
- Enter your loan amount, annual interest rate, and loan term in years.
- Select your loan type and currency, then click Calculate Payment.
- View your monthly payment, total interest, payment breakdown chart, and full amortization schedule.
Methodology
Uses the standard amortization formula: PMT = P × [r(1+r)^n] / [(1+r)^n – 1], where P is principal, r is monthly rate (annual ÷ 12), and n is total payments (years × 12). This is the same formula used by banks worldwide. Each month, interest is charged on the remaining balance. The rest of your payment reduces the principal. This repeats until the balance reaches zero. The formula assumes a fixed rate and equal payments. It does not include fees like origination charges. To compare offers that include fees, use the APR (Annual Percentage Rate) instead — it rolls the rate plus lender fees into one figure, as required by the Truth in Lending Act.
Understanding Your Results
Monthly payment — the fixed amount due each month. Total interest — how much you pay beyond what you borrowed. This is the real price of the loan. The breakdown bar shows the principal-vs-interest split. Longer terms shift this ratio heavily toward interest — sometimes approaching half the principal on high-rate loans. The balance chart shows your debt declining over time. A flat curve early on means most payments are servicing interest. It steepens toward the end as more goes to principal. In the amortization table, look for the crossover point — the month where principal first exceeds interest. On a typical 5-year auto loan, this happens around month 25-30. You can export the schedule to CSV for further analysis.
Sources
- Consumer Financial Protection Bureau – Auto Loans
- Federal Trade Commission – Financing or Leasing a Car
- Consumer Financial Protection Bureau – Student Loans
- Consumer Financial Protection Bureau – What Is Amortization?
- Consumer Financial Protection Bureau – Interest Rate vs. APR
- Federal Reserve – Consumer Credit Statistical Release (G.19)
Practical Examples
Auto Loan: A $28,000 car loan at 6.5% for 5 years results in a monthly payment of $548. Over 60 months, you pay $4,882 in total interest, making the true cost of the car $32,882. Extending to 6 years drops the payment to $468 but increases total interest to $5,696 — an extra $814 for the convenience of a lower monthly payment. Personal Loan for Debt Consolidation: Consolidating $15,000 in credit card debt (typically 20-25% APR) into a personal loan at 10% for 3 years gives a monthly payment of $484. Total interest paid is $2,420. Compared to making minimum payments on high-rate credit cards, this could save thousands in interest and provides a fixed payoff date. Student Loan: A $35,000 student loan at 5.5% over 10 years requires monthly payments of $380. Total interest over the full term is $10,558 — nearly a third of the original loan amount. Switching to a 5-year repayment plan raises the payment to $669 but cuts total interest to $5,133, saving $5,425. Home Equity Loan: Borrowing $50,000 against home equity at 8% for 15 years means a monthly payment of $478. Total interest is $35,986 — meaning you pay back $85,986 for $50,000 borrowed. A shorter 10-year term raises the payment to $607 but reduces total interest to $22,796, a savings of over $13,000. These examples use the same amortization formula as this calculator. Enter your own numbers to see your exact payment schedule and explore different scenarios.
Tips for Borrowers
Compare multiple offers before committing. Even a 0.5% difference in interest rate on a $25,000 loan saves roughly $350 over 5 years. Request your credit report before applying — errors on your report can unfairly raise your offered rate, and disputing inaccuracies is free. Consider the total cost, not just the monthly payment. Dealers and lenders often emphasize low monthly payments achieved through longer terms, which increase your total interest significantly. Use this calculator to see the full picture before accepting any offer. Make extra payments toward principal when possible. Even an extra $50 per month on a $25,000 loan at 6.5% can shave several months off a 5-year loan and save hundreds in interest. Confirm with your lender that extra payments reduce principal, not just prepay future installments. Avoid skipping payments even when offered the option. Payment holidays extend your term and accrue additional interest on your existing balance. If cash is tight, contact your lender to discuss hardship options before missing a payment. Review your amortization schedule before signing. Understanding exactly how much interest you will pay over the life of the loan helps you make realistic comparisons between offers and avoid loans that cost far more than the sticker price suggests.
All calculations are performed locally in your browser. No data is sent to any server.