About LoanMath
Free calculators for decisions that are usually explained badly by the people selling you the loan.
LoanMath builds single-purpose calculators: you put in real numbers, you get a real answer, and you do not have to hand over an email address to see it.
The site started with one question that refinance offers routinely dodge: does the lower monthly payment actually cost you more? Our auto loan refinance calculator answers that in one screen — monthly change, total interest change, break-even months, and a plain verdict.
How the numbers are produced
All calculations run in your browser with the standard amortization formula. Nothing you type is sent to a server, stored, or shared.
Monthly payment = P × r × (1+r)n ÷ ((1+r)n − 1), where P is the balance, r the monthly rate (APR ÷ 12) and n the number of months.
What we are not
We are not a lender, broker or financial adviser, and we do not sell leads. We do not receive your data and cannot quote you a rate. Every figure on this site is an estimate for education; the binding numbers are the ones in your loan contract.
Advertising
This site is supported by display advertising. Advertisers do not see the numbers you enter, because those never leave your browser. See our privacy policy for details on cookies and third-party ad technology.
Corrections
If a calculation looks wrong, tell us — a wrong calculator is worse than no calculator. Use the contact page and include the inputs you used.