How This Loan Calculator Works
This calculator estimates your monthly payment for any fixed-rate loan — personal loans, auto loans, student loans, or business loans. Enter your loan amount, interest rate, and term, and it instantly calculates your monthly payment along with the total interest you’ll pay over the life of the loan.
The Loan Payment Formula
M = P × [r(1+r)^n] / [(1+r)^n − 1]
Where M = monthly payment, P = loan amount (principal), r = monthly interest rate (annual rate ÷ 12), n = total number of payments (months)
What Affects Your Monthly Payment?
- Loan amount: A larger loan means a higher monthly payment, all else equal
- Interest rate: Determined by your credit score, lender, and loan type
- Loan term: A longer term lowers your monthly payment but increases total interest paid
Tips for Reducing Total Interest
Making extra payments toward the principal, choosing a shorter loan term, or improving your credit score before applying can all reduce the total interest you pay over the life of the loan.
Frequently Asked Questions
Is it worth paying off a loan early?
If your loan doesn’t have a prepayment penalty, paying it off early usually saves you money on interest, especially in the earlier years of the loan when interest makes up a larger share of each payment.
What’s the difference between fixed and variable interest rates?
A fixed rate stays the same for the life of the loan. A variable rate can change over time based on market conditions — often starting lower but carrying more risk.
Does this calculator work for all loan types?
Yes, it works for any loan that uses standard fixed-rate amortization — personal loans, auto loans, student loans, and business loans.