About this Loan Calculator
Taking out a loan is a major financial commitment. Whether it's for a business, a vehicle, or personal use, knowing your exact monthly obligation is the first step to financial health. This calculator provides the critical numbers you need to negotiate better terms.
How to use this calculator
- Enter the full Loan Amount (principal) you intend to borrow.
- Input the annual Interest Rate offered by your lender.
- Select the Loan Term in years to see your monthly amortization.
- Review the 'Total Interest' to understand the true cost of borrowing.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
Inputs explained
Loan Amount
The total amount of money you are borrowing from the lender. Do not include your down payment here.
Annual Interest Rate
The cost of borrowing money, expressed as a percentage per year. This is usually the APR (Annual Percentage Rate).
Loan Term
The amount of time you have to repay the loan. Longer terms lower your monthly payment but increase the total interest paid.
Understanding your results
Example scenarios
Short vs Long Term
Borrowing $25,000 at 5% for 3 years results in a payment of ~$749 and ~$1,960 in total interest. Extending that same loan to 6 years lowers the payment to ~$395 but raises total interest to ~$4,000.
High Interest Impact
A $10,000 loan at 5% for 5 years costs ~$1,322 in interest. At 15% interest (common for personal loans), that cost jumps to ~$4,270.
Key Features
- Universal for all fixed-rate loans
- Instant interest breakdown
- Total cost visualization
Things to Keep in Mind
This calculator assumes a fixed interest rate for the entire duration of the loan. It does not account for variable rates, prepayment penalties, or late fees.
Tips & Best Practices
- Always check if your lender charges a prepayment penalty. If not, paying even $20 extra per month can save you significant interest.
- Focus on the APR, not just the interest rate. APR includes fees and gives a more accurate cost comparison.
- Don't shop based on monthly payment alone. Dealers often extend loan terms to 72 or 84 months to 'lower' the payment, hiding the massive interest costs.
Glossary of Terms
- Principal
- The original sum of money borrowed in a loan, or put into an investment.
- Amortization
- The process of paying off a debt over time through regular payments.
- Term
- The period of time over which a loan is scheduled to be repaid.