How the Loan Calculator Works
This loan calculator estimates your monthly payment, total interest, and overall repayment cost for a fixed-rate installment loan. It uses the standard amortization formula based on three inputs: principal (loan amount), annual interest rate (APR), and loan term in months or years. The calculation assumes equal monthly payments over the full term. Each payment covers both interest and principal, with the interest portion decreasing over time as the outstanding balance falls.
How to use this calculator
1. Enter the total loan amount (principal).
2. Enter the annual interest rate as a percentage (for example 8.5 for 8.5%).
3. Choose the loan term in years or months.
4. Click Calculate to see the estimated monthly payment, total amount payable, and total interest.
The result is an estimate only. Actual lender offers may include processing fees, insurance, or different compounding methods.
Frequently Asked Questions
What formula does the loan calculator use?
It uses the standard fixed-rate amortization formula: M = P × r(1+r)^n / ((1+r)^n − 1), where M is the monthly payment, P is the principal, r is the monthly interest rate, and n is the number of payments.
Does this include taxes or insurance?
No. The calculator shows only principal and interest. Real loans often include additional costs such as processing fees, GST, insurance, or stamp duty.
Can I use this for home loans or car loans?
Yes, as long as the loan is a fixed-rate installment loan with equal monthly payments. For floating-rate or interest-only loans the calculation will differ.
Why is the lender’s quote different from this result?
Lenders may use different compounding frequencies, add fees, or apply rate concessions. Always compare the final offer document.
Practical tips
Tips for better loan decisions:
• Compare the total interest, not just the monthly payment.
• A slightly higher rate with a shorter term can sometimes cost less overall.
• Check whether the rate is fixed or floating before signing.
• Prepayment options and foreclosure charges can significantly affect the real cost.
This tool provides estimates for informational purposes only. Always verify important figures with your bank, lender, or a qualified professional before making financial decisions.