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Missing Loan-Term Calculator

If you know any three of a loan’s four terms (principal, interest rate, payments remaining, and payment amount), this calculator will help you to find the missing term. For example, if you know the interest rate, the payments remaining, and the payment amount, this calculator will compute the current payoff amount of the loan. All results should be interpreted as close approximations (testing to date has shown results to be accurate within .002% of the actual).

Enter the three known values in the appropriate entry fields and click “Compute.” Note that when trying to find the interest rate, you should select a “guess” from the pull-down menu by the same name. The closer your guess is to the actual interest rate, the faster the calculator will arrive at a result. If you don’t select a “guess” the calculator automatically starts out at a 10% guess and works up or down until it finds a close approximation. If it turns out the actual rate is 19.95% it could take the calculator as many 56,000 iterations to find the answer. On the other hand if you had “guessed” 19% the calculator’s iterations would be reduced significantly.

Principal (current payoff amount)
Interest Rate
# of Payments Remaining
Payment Amount

The folks at Glass & Company have been with us since day one. They are a great group of people and have played a vital role in our growth from a start-up company in 1998 to a $110 million entity today. Our relationship has developed into a valuable resource throughout the years and I consider them a trusted advisor.”

– Gino Inman, General Partner, Republic Plastics, Ltd.

500 W. 5th Street, Suite 1210 Austin, TX 78701 • Phone: 512-480-8182 • Fax: 512-480-9465 • info@glasscpa.com