Loan Calculator

This calculator computes your fixed monthly loan payment based on the amount borrowed, annual interest rate, and repayment term. It also generates a complete amortization schedule showing how much of each payment goes toward principal versus interest, and how your outstanding balance decreases year by year. Whether you are considering an auto loan, a personal loan, or refinancing existing debt, this tool gives you a clear picture of your financial obligation before you sign any paperwork.

Loan payments are calculated using the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n - 1]. In this equation, M represents your fixed monthly payment, P is the principal (the amount borrowed), r is the monthly interest rate (the annual rate divided by 12), and n is the total number of payments (the loan term in years multiplied by 12).

The reason this formula produces a fixed payment is mathematical elegance: each month, interest accrues on the remaining balance, and whatever is left over from your payment reduces the principal. Early in the loan, the balance is highest, so a larger portion of your payment covers interest. For example, on a 30-year mortgage, your first payment might be 80% interest and only 20% principal. Over time, as the balance shrinks, the interest portion drops and the principal portion rises. By the final payments, nearly everything goes toward principal. This front-loaded interest structure is why paying extra toward principal early in the loan can dramatically reduce total interest paid.

Suppose you take out a $30,000 auto loan at 6% APR for 5 years. The monthly interest rate is 0.5% (6% divided by 12), and the total number of payments is 60. Plugging these values into the amortization formula gives a fixed monthly payment of approximately $579.98. Over the full 60 months, you will pay a total of $34,798.80. Subtracting the original $30,000 principal leaves $4,798.80 in total interest. In the first year alone, roughly $1,650 of your payments covers interest, while only about $5,310 reduces the principal balance.

Before applying for any loan, run the numbers here first. Knowing your exact monthly payment helps you determine whether the loan fits within your budget without guessing. A lender might tell you the rate, but seeing the actual dollar amount you will owe every month puts the commitment in concrete terms.

Comparing lender offers is another essential use. Two lenders might advertise similar rates, but differences in fees, terms, or compounding methods can change your total cost by hundreds or thousands of dollars. Plug each offer into this calculator to see which truly costs less over time.

If you are considering refinancing an existing loan, this tool reveals whether a lower rate or shorter term actually saves money. Refinancing often comes with closing costs, so you need to calculate the break-even point where savings exceed fees. For home loans, use our mortgage calculator which includes property taxes, insurance, and PMI.

Debt consolidation decisions also benefit from precise calculations. Combining multiple high-interest debts into a single personal loan only makes sense if the new monthly payment is manageable and the total interest paid drops. Check your debt burden with our debt-to-income calculator before applying.

Finally, use this calculator for long-term budgeting. Seeing the full amortization schedule shows exactly when your balance will drop below certain thresholds, helping you plan for major life events like buying a home, starting a family, or changing careers.