Loan Calculator

About the Loan Calculator

What Is a Loan?

A loan is borrowed money that you agree to pay back over time, usually with interest. The lender — a bank, credit union, or online lender — gives you a lump sum upfront, and you repay it in fixed monthly installments over an agreed term. Loans come in many forms: personal loans for debt consolidation or emergencies, auto loans for vehicle purchases, student loans for education, and business loans for entrepreneurs. What they all share is the same underlying math: the amortization formula.

How This Calculator Works

Our loan calculator uses the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n – 1], where M is the monthly payment, P is the loan amount, r is the monthly interest rate (annual rate divided by 12), and n is the total number of payments (years × 12). This formula accounts for the fact that with each payment, a portion goes toward interest and the remainder reduces your principal balance. The calculator then multiplies your monthly payment by the number of payments to show you the total cost of the loan and subtracts the original amount to isolate total interest paid. It also projects your payoff date based on the loan term.

Common Use Cases

Personal loans: When consolidating credit card debt at a lower rate, use this calculator to see if the monthly payment fits your budget and how much interest you'll save versus carrying credit card balances. Auto loans: Before walking into a dealership, calculate payments at different rates and terms so you know what you can afford. A 72-month loan has a lower monthly payment than a 48-month loan but costs significantly more in total interest. Student loans: Model federal and private student loan payments before borrowing. Knowing your future monthly obligation helps you make smarter decisions about how much to borrow. Debt comparison: Compare two loan offers with different rates and terms side by side by running the calculator twice.

Tips and Best Practices

Shorter terms save money: A $25,000 loan at 5.5% over 3 years costs about $2,170 in interest. Stretch it to 7 years and you'll pay roughly $5,150 in interest — more than double — even though the monthly payment drops from $755 to $359. Always balance monthly affordability against total cost.

Watch out for origination fees: Many lenders charge an origination fee (1–8% of the loan amount) that gets deducted from your proceeds. If you borrow $25,000 with a 5% origination fee, you only receive $23,750 but still owe interest on the full $25,000. Factor this into your calculations.

Check for prepayment penalties: Some loans charge a fee if you pay them off early. If your loan has no prepayment penalty, making extra payments toward principal can save you hundreds or thousands in interest and shorten your payoff timeline.

Frequently Asked Questions

What's the difference between APR and interest rate? The interest rate is the cost of borrowing the principal, expressed as a percentage. APR (Annual Percentage Rate) includes the interest rate plus any fees — origination fees, closing costs, etc. — giving you a truer picture of the loan's cost. Always compare APRs, not just interest rates.

Can I pay off my loan early? Usually yes, but check your loan agreement. Federal student loans and many personal loans allow early payoff without penalty. Auto loans and mortgages sometimes include prepayment penalties, especially for the first few years.

How does my credit score affect my loan rate? Lenders use your credit score to gauge risk. Borrowers with scores above 740 typically qualify for the best rates. Those below 670 may face significantly higher rates or be denied altogether. Improving your credit score by even 50 points before applying can save you thousands over the life of a loan.