Free Loan Payment Calculator — Monthly Installment & Total Interest
This tool estimates your fixed monthly payment on a standard amortizing loan: you enter principal, annual interest rate, and term in months, and it returns payment, total paid, and interest cost. It is designed for borrowers and shoppers who want a quick, private sanity check before comparing formal offers from banks, credit unions, or dealers. Results are educational only—your lender’s disclosures, fees, and rounding may differ slightly from what you see here.
Follow these steps to get a reliable estimate. Each step builds on the previous one so you can compare scenarios without leaving the page.
Select a currency from the menu. This only changes how amounts are formatted (symbols and grouping); it does not change the math. Pick the currency that matches your quote or bank statement so the output is easier to read at a glance.
Enter the loan amount you plan to borrow—the principal after any down payment if you are modeling net financing. If your lender rolls origination fees into the loan, include that financed amount here so the payment reflects what you will actually repay.
Enter the annual interest rate as a percentage (for example, 6.99 for 6.99% APR on a simple fixed-rate model). The calculator converts that to a monthly rate internally. If you have a promotional 0% offer, you can enter 0 and the tool will spread the principal evenly across the months.
Enter the term in months (for example, 36, 48, 60, or 72 for auto loans; 360 for a 30-year mortgage expressed in months). Longer terms usually lower the monthly payment but increase total interest, which you can confirm by changing only the term and recalculating.
Click “Calculate Your Loan Now” to see monthly payment, total interest, and total payment. Adjust any input and run again to compare offers side by side before you apply or sign.
How it works
LoanWise uses the same standard fixed-rate amortization model that most installment loans use when they quote a level monthly payment. Each month, interest accrues on the remaining balance; the portion of your payment above that interest retires principal. Early in the loan, more of each payment covers interest; near the end, almost all of it reduces principal. The calculator assumes the rate stays constant for the whole term and that payments are made on time—assumptions that match many car, personal, and simple mortgage products, though not every real-world loan.
Mathematically, let P be the principal, n the number of months, and r the monthly interest rate (annual rate ÷ 100 ÷ 12). When r > 0, the monthly payment is
M = P × r × (1 + r)n / ((1 + r)n − 1)
Total payment is M × n, and total interest is total payment minus P. When the annual rate is 0%, the tool uses M = P / n so you still get a sensible flat payment. This mirrors the logic in our on-page script: it converts your annual percentage to a monthly rate, applies the formula above, then sums interest across the schedule implied by a constant payment.
Why use this tool
Clarity before you commit. Seeing payment, total paid, and interest in one place helps you judge whether a loan fits your budget and whether a longer term is worth the extra lifetime cost. You can iterate in seconds instead of rebuilding spreadsheets for every quote.
Fair comparisons between offers. When two lenders quote different rates or terms, plugging each scenario into the same formula isolates what actually changed. That reduces the chance you will focus only on a lower monthly payment while missing thousands in additional interest.
Privacy-friendly planning. You do not create an account or upload documents; numbers stay in your browser session for estimation. Pair this with our specialized car, mortgage, and personal calculators when you want a product-specific context.
Frequently asked questions
Is this monthly payment exactly what my bank will charge?
Not necessarily. Banks and dealers may round payments to the nearest cent differently, apply odd-day interest, or include taxes, insurance, or fees outside the principal-and-interest model. This calculator shows the standard amortizing payment for the numbers you entered. It is excellent for comparison shopping and budgeting, but you should always rely on your official loan estimate or contract for the binding amount. If your lender bundles fees into the financed balance, increase the principal field so the estimate moves closer to reality.
Why does a longer loan term lower my payment but cost more overall?
A longer term spreads the same principal across more payments, so each installment is smaller and easier on cash flow. However, you pay interest for more months, and early payments are still front-loaded with interest on the remaining balance. That combination almost always raises total interest paid even though each check is lower. Run the calculator twice with the same amount and rate but different terms to see the trade-off numerically before you choose convenience over total cost.
Can I model a mortgage or a car loan with this tool?
Yes, as long as you are comfortable with a simplified principal-and-interest picture. Enter the amount you finance, the annual rate, and the term in months (for a 30-year mortgage, use 360). The same formula applies across many consumer loan types. Real mortgages often add escrow for taxes and insurance, and auto loans may include add-on products; this page does not model those separately. For more targeted copy and context, open our mortgage calculator or car loan calculator after you have explored the numbers here.
What if I make extra payments or pay off early?
This interface assumes you pay exactly the scheduled amount every month until the term ends. Extra principal payments reduce the balance faster, shorten the payoff date, and cut total interest, but the outcome depends on your lender’s rules and whether they recalculate or simply shorten the term. Use the results here as a baseline payment; then ask your lender how prepayments are applied. We also offer a calculator with extra payments when you want to explore that path in more detail.
Does LoanWise store the loan amounts I type in?
LoanWise does not require a login for this calculator, and the tool is built for quick, local estimation rather than underwriting. Your inputs are used in the browser to produce the displayed results; we do not run a credit application or save your numbers as a loan file on your behalf. Normal website analytics may still record which pages were viewed and technical information as described in our privacy policy. For personalized advice about taxes, legal matters, or suitability of a specific product, consult a qualified professional.