🏦 Loan Calculator
Monthly payment, total cost and interest
About the Loan Calculator
Taking out a loan is one of the bigger financial decisions most people make, and understanding what a loan actually costs before you sign is important. The Loan Calculator shows you your estimated monthly payment, total interest paid over the life of the loan, and the total repayment amount, all from three inputs: loan amount, interest rate, and loan term.
The calculation uses the standard amortization formula, which spreads payments evenly across the life of the loan. In the early months, a larger share of each payment goes toward interest rather than principal, and that ratio gradually shifts over time. An amortization schedule, if shown, lets you see exactly how this works month by month, which can be eye-opening if you have never looked at one before.
Interest rate has a larger effect on total cost than many borrowers realize. A seemingly small difference of one or two percentage points on a large loan or a long term can translate into thousands of dollars in extra interest payments. Running the calculator with different rate scenarios side by side makes that impact concrete and easy to compare before you commit.
Loan term length is the other major lever. A longer term lowers your monthly payment, which helps with cash flow, but it also means paying interest for more months, which increases the total amount you repay. A shorter term raises the monthly payment but dramatically reduces total interest. The calculator lets you explore that trade-off with any numbers you choose.
This tool is useful for mortgages, auto loans, personal loans, student loans, and any other fixed-rate installment borrowing. Keep in mind that actual loan offers from lenders will include additional factors like origination fees, insurance requirements, and credit score adjustments that affect the effective cost beyond the base interest rate.
How it works
- Enter the total loan amount you are borrowing or considering borrowing.
- Enter the annual interest rate as a percentage. Use the rate quoted in your loan offer or an estimate for comparison purposes.
- Enter the loan term in months or years depending on which option the tool provides.
- Review the calculated monthly payment, total interest paid, and total repayment amount displayed in the results.
- Try different combinations of amount, rate, and term to compare scenarios and understand the trade-offs before making a decision.
What you'll learn
- Amortization means spreading equal payments over a fixed period, with each payment covering accrued interest first and then reducing the principal balance.
- The annual percentage rate (APR) is a broader measure of loan cost than the interest rate alone because it includes fees and other charges.
- Paying even a small additional amount toward principal each month can reduce the total interest paid and shorten the loan term significantly.
- Fixed-rate loans keep the same interest rate for the entire term, while variable-rate loans can change periodically based on a reference index.
- A shorter loan term always results in less total interest paid even though monthly payments are higher, because interest accrues for fewer months.
- Lenders use credit scores to set interest rates, so borrowers with higher scores typically qualify for lower rates and meaningfully lower total costs.
FAQs
- What is an amortization schedule?
- An amortization schedule is a table showing each payment over the life of the loan, broken down into the interest portion and the principal portion. It shows exactly how the balance decreases over time.
- Does this calculate mortgages as well as personal loans?
- Yes. The formula works for any fixed-rate installment loan. Mortgages typically have longer terms, usually 15 or 30 years, while personal loans are often shorter.
- Why is my monthly payment mostly interest at the start?
- Because interest is calculated on the outstanding balance, which is highest at the beginning. As you pay down the principal, the interest portion shrinks and more of each payment reduces the balance.
- Can I see how extra payments would affect my loan?
- The basic calculator shows standard repayment. For extra payment scenarios, you would need an advanced amortization tool that lets you model one-off or recurring additional payments.
- Are the results here exact enough to use for a real loan decision?
- The results are accurate for standard fixed-rate amortization, but actual loan costs from lenders may include fees, insurance, or other charges not reflected here. Always review the full loan agreement before signing.
Disclaimer: This calculator is for general informational and educational purposes only and does not constitute financial advice. Results are estimates based on the inputs provided and do not account for lender fees, credit assessment, or other factors that affect actual loan terms. Consult a qualified financial advisor or lender before making borrowing decisions.