Finsanta financial tool
Interest rate calculator on a loan
Estimate the interest paid on a loan and compare how rate and term affect total borrowing cost.
Your estimate
$3,088.66
Estimated total interest
Monthly payment
$376.85
Total repayment
$18,088.66
Loan term
48 months
Understand your loan's interest
Use this planning calculator to see how a loan's annual rate and repayment term translate into monthly payments and total interest. Compare scenarios before refinancing or borrowing.
Know the rate
Use APR when comparing offers with fees.
Shorten the term
A faster payoff often lowers total interest.
Review the contract
Daily interest and fees can change lender results.
Explore more finance guidance
Frequently asked questions
How is interest charged on a loan?
Most installment loans calculate periodic interest from the outstanding principal balance. The exact method can vary by lender and product.
Why does the interest amount change each month?
As principal is repaid, the balance used to calculate interest usually falls, so the interest portion of a fixed payment declines.
What is the fastest way to lower interest?
Reducing the rate, shortening the term, and making extra principal payments can all reduce future interest when allowed by the loan agreement.