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Most people look at the sticker price of a loan — the amount they need — and stop there. The number that actually determines whether you can afford it is the monthly payment, and the number that determines whether the deal is good is the total cost. These two figures pull in opposite directions: a lower monthly payment almost always means a longer term and more total interest paid.

This tool applies the same amortization math lenders use. Every month, interest accrues on whatever balance remains. Your fixed payment covers that month's interest first, then chips away at principal. Early in the loan, most of your payment is interest. Near the end, most is principal. The split shifts gradually — that is what amortization means. The total interest you pay is entirely a function of the rate, the balance, and how long you take to repay it.

Origination fees work differently. They are taken off the top before you receive money, but your payment is still calculated on the full loan amount. That means you pay interest on money you never held. A loan with a low rate and a high fee can cost more than a loan with a higher rate and no fee. The only way to compare fairly is to look at the all-in total cost, which this tool surfaces directly.

Use this tool when you have a specific loan offer in hand — an amount, a rate, and a term — and need to verify the monthly payment before accepting. It is also useful for comparing two or three competing offers by running each through the calculator and comparing total cost side by side. Small business owners use it to evaluate equipment financing or working capital loans before engaging with a lender formally.

This tool is also appropriate early in the research phase: enter a target monthly payment you know you can afford, then adjust the loan amount and term until the payment fits. That gives you a borrowing ceiling to take into lender conversations.

This tool is not appropriate for mortgages that include property tax and insurance in the monthly payment (use a PITI calculator), for variable-rate or adjustable-rate loans where the rate will change, or for loans with deferred interest or balloon payments. If your loan agreement has a payment schedule that is not a fixed monthly amount, this estimate will not match your actual payments.

Comparing monthly payments across loans with different terms. A 7-year loan will almost always have a lower monthly payment than a 3-year loan for the same amount, but the total interest paid can be more than double. The monthly payment is a cash flow number; it says nothing about the loan's cost. Always compare offers on total repayment cost and APR, not payment size alone.

Ignoring the origination fee when calculating what you can borrow. If you need exactly $15,000 in your account for a project and the lender charges a 1.5% origination fee, you will need to borrow more than $15,000 — because the fee is deducted before funds are disbursed. Borrowing $15,000 delivers only $14,775 after the fee. Failing to account for this means arriving at closing short on funds.

Treating a pre-qualification rate as locked. This calculator uses the rate you enter — which may be an estimate from a lender website or a pre-qualification range. Hard approvals often come back higher, especially if your credit score or income changes between application and closing. Build a buffer: run the calculator at one or two percentage points above the quoted rate to see whether the payment remains affordable.

The amortization formula calculates a fixed monthly payment M such that after exactly n payments, the balance reaches zero. The number of monthly periods is the term in years multiplied by 12. For the example inputs, that is 48 monthly periods.

The monthly interest rate is the annual rate divided by 100 and then by 12. The formula then raises the quantity (1 + monthly rate) to the power of the number of periods to get a compounding factor. Monthly payment equals the loan principal multiplied by the monthly rate times the compounding factor, all divided by the compounding factor minus one.

When the interest rate is exactly zero, the formula simplifies: the monthly payment equals the loan amount divided by the number of periods, since there is no interest to compute. For the example, the monthly payment is $369.72. Multiply that by 48 to get total repayment of $17,972, subtract the original loan amount to get total interest of $2,747, and add the origination fee of $225 to confirm the all-in cost.

The amortization formula assumes payments are perfectly periodic and that interest compounds at exactly the monthly rate. In practice, lenders may use a 365-day or 360-day interest year, apply per-diem interest for odd days at origination, or round payments to the nearest cent and adjust the final payment. These factors can shift the actual total cost by a small but non-trivial amount. For large loan amounts, even a 0.01% difference in compounding convention changes total interest meaningfully.

Origination fees are not just an upfront cost — they raise the effective APR above the stated rate, sometimes substantially for short-term loans. A 3% fee on a 1-year loan represents roughly 3 additional percentage points on the true cost of borrowing. For short terms, this fee effect dominates; for longer terms, the rate dominates. Practitioners evaluate both components separately before recommending a product.