How this loan calculator works
Enter the loan amount you plan to borrow, the annual interest rate offered by the lender, and the repayment term in years. The calculator instantly works out your fixed monthly payment (sometimes called an EMI, or Equated Monthly Installment), the total interest you'll pay over the life of the loan, and the total amount you'll repay in all. The yearly breakdown table below the results shows exactly how much of each year's payments goes toward principal versus interest, and how your remaining balance shrinks over time.
Understanding your monthly payment
A standard fixed-rate loan uses amortization: every monthly payment is the same size, but the mix of principal and interest inside it changes over time. Early in the loan, most of your payment covers interest because the outstanding balance is still large. As the balance drops, less of each payment is eaten by interest and more goes toward paying down the principal. This is why the "principal paid" column in the breakdown table grows year over year while the "interest paid" column shrinks.
The formula behind the monthly payment is:
M = P × [r(1+r)^n] / [(1+r)^n − 1]
where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments (years × 12).
Fixed vs. variable interest rates
This calculator assumes a fixed rate — one that stays the same for the entire term, so your payment never changes. A variable (or adjustable) rate loan can rise or fall with market conditions, which makes payments harder to predict. If you're comparing offers, ask whether the quoted rate is fixed for the full term or only for an introductory period.
Tips to reduce the total interest you pay
- Shorten the term if you can afford the higher payment. A 15-year loan carries a noticeably higher monthly payment than a 30-year loan for the same amount, but the total interest paid is usually far lower.
- Make extra payments toward principal whenever your budget allows — even small, occasional overpayments can shave months or years off the loan and reduce interest significantly.
- Compare the APR, not just the headline rate. The APR (annual percentage rate) bakes in most lender fees, giving a more accurate picture of the true cost of borrowing.
- Improve your credit profile before applying. A stronger credit score typically qualifies you for a lower interest rate, which lowers both the monthly payment and the total interest.
- Avoid stretching the term just to lower the monthly figure. A longer term reduces the monthly payment but increases the total interest paid over the life of the loan.
Frequently asked questions
What's the difference between the interest rate and the APR?
The interest rate is the cost of borrowing the principal, expressed as a yearly percentage. The APR includes the interest rate plus most lender fees and closing costs, spread over the loan term — so it's usually a little higher than the interest rate and is a better number to use when comparing offers from different lenders.
Does a longer loan term always cost more overall?
Almost always, yes. A longer term lowers your monthly payment, but you pay interest for more months, so the total interest paid over the life of the loan is typically higher than with a shorter term at the same rate.
Can I pay off this type of loan early?
Many loans allow early repayment, but some lenders charge a prepayment penalty. Check your loan agreement — if there's no penalty, paying extra toward principal is one of the most effective ways to cut total interest.
How is the monthly payment split between principal and interest?
Each month, interest is calculated on the current outstanding balance, and the rest of the fixed payment reduces the principal. As the balance falls, the interest portion falls too, so a growing share of each payment pays down principal — this is exactly what the yearly breakdown table above shows.
Is this calculator's result exact?
The figures are close estimates based on the loan amount, rate and term you enter, assuming a fixed rate and equal monthly payments with no fees. Your actual lender may apply slightly different rounding, fees, or day-count conventions, so use this as a planning guide rather than a final quote.
This calculator is for general informational purposes only and does not constitute financial advice. Speak with a licensed financial advisor or your lender for guidance specific to your situation.