How the loan calculator works
Loan Calculator provides clear financial estimates of monthly payments, total interest costs, and total repayment amounts for fixed-rate installment loans. Whether you are shopping for a home mortgage, purchasing a vehicle, or consolidating personal credit card debt, understanding the relationship between interest rates and loan terms helps you save thousands of dollars over the life of a loan.
Calculations assume fixed monthly compounding interest in accordance with standard international banking formulas.
Step-by-step instructions
- Enter the loan principal amount (the total amount borrowed).
- Enter the annual interest rate percentage (APR).
- Enter the loan term in years or months.
- Click Calculate to view your estimated monthly payment and total interest breakdown.
Standard Fixed Amortization Payment Formula
M = P * [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]Where M = monthly payment, P = loan principal, r = monthly interest rate (annual APR ÷ 12 ÷ 100), and n = total number of monthly payments (term in years × 12).
Practical example
Borrowing $25,000 for a car loan at 6.0% APR over 5 years (60 months): Monthly rate r = 0.005. Monthly payment M = $483.32. Total interest paid over 5 years = $3,999.20.
Frequently asked questions
Does this include property taxes or private mortgage insurance (PMI)?
This calculator computes the principal and interest (P&I) portion. Escrow costs like homeowner's insurance and property taxes must be added separately.
What happens if interest rate is 0%?
For 0% promotional loans, the calculation simplifies to Principal divided by the number of months (P / n).
Is this financial advice?
No. This calculator provides mathematical estimations for general planning. Official loan disclosures from licensed lenders may include origination fees and specific compounding rules.