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Loan Calculator

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How to Use the Loan Calculator

The Loan Calculator helps you understand the full cost of any installment loan before you commit. Enter your loan amount, annual interest rate, and repayment term to instantly see your monthly payment, total amount repaid over the life of the loan, and the total interest cost. This transparency is essential for comparing loan offers, negotiating better terms, or deciding whether a loan fits your budget before signing any agreement.

The calculator uses the standard equal-installment amortization formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where M is the monthly payment, P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments. Each payment covers both interest (front-loaded in early payments) and principal (which grows over time as the balance decreases). The amortization schedule shows this breakdown year by year, helping you see exactly how much of each payment reduces your balance versus paying interest charges.

This calculator applies to any fixed-rate installment loan: mortgages, auto loans, personal loans, student loans, and home equity loans. Variable-rate loans will have different actual payments than projected here. Results are estimates for planning purposes and do not constitute a loan offer or financial advice. Always verify actual terms with your lender, including origination fees, prepayment penalties, and any other costs not captured in the base interest rate that affect your true cost of borrowing.

How to Use the Loan Calculator

  1. 1

    Enter the Loan Amount — the total principal you plan to borrow, not including fees or closing costs.

  2. 2

    Enter the Annual Interest Rate (%) — use the APR (Annual Percentage Rate) from your loan offer for the most accurate comparison.

  3. 3

    Set the Loan Term in years — common terms are 5 years for auto loans, 15 or 30 years for mortgages, and 2–7 years for personal loans.

  4. 4

    Click Calculate to see your monthly payment, total amount paid over the full term, and total interest cost.

  5. 5

    Review the amortization table to understand how each payment is split between principal and interest over time.

  6. 6

    Compare multiple scenarios by changing the interest rate or loan term to identify the most affordable borrowing option.

Frequently Asked Questions

What is an amortization schedule?
An amortization schedule is a complete table showing the breakdown of each loan payment into principal and interest. In the early months, most of each payment goes toward interest. As the loan matures, more goes toward reducing the principal balance. Our calculator shows this breakdown year by year.
Why is so much of my early payment interest?
This is how amortized loans work. Your interest charge each period is based on your outstanding balance. When the balance is high at the start, the interest portion is large. As you pay down the principal, the interest charge shrinks and more of your fixed payment goes toward reducing the balance.
Should I choose a shorter or longer loan term?
A shorter term means higher monthly payments but significantly less total interest. A longer term lowers monthly payments but increases total cost. For example, a $200,000 mortgage at 6%: 15-year term costs about $52,000 in total interest; a 30-year term costs about $232,000. The 30-year option nearly doubles the total interest paid.
What is the difference between interest rate and APR?
The interest rate is the cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate plus other costs such as origination fees, broker fees, and mortgage points. APR is the better number to use when comparing loans because it reflects the true annual cost of borrowing.
Can I use this for a mortgage calculation?
Yes. Enter the loan amount (home price minus down payment), your mortgage interest rate, and the term (typically 15 or 30 years). Note that your actual monthly mortgage payment may be higher because it often includes property taxes and homeowner's insurance paid into escrow.
How do extra payments affect the total loan cost?
Extra payments go directly toward reducing the principal balance, which reduces the total interest you pay and shortens the loan term. Even a small additional payment each month can save thousands in interest over the life of a mortgage or long-term loan.
What loan term is recommended for a car loan?
Most financial advisors recommend auto loan terms of 48–60 months or shorter. Longer terms (72–84 months) lower monthly payments but result in paying significantly more interest and risk the car being worth less than you owe. A good rule is that your total monthly car payment should not exceed 15% of your take-home pay.
Are the calculated results exact?
The monthly payment and amortization figures are mathematically exact based on the inputs you provide. However, actual loan costs may differ due to origination fees, closing costs, prepayment penalties, or variable rate adjustments not included in this calculation. Always confirm all terms with your lender.