This dental practice loan payment calculator works out the monthly payment, total interest and total repaid for a loan amount, annual rate and term you enter. Marbleharbor Advances, a small-business funding broker in Franklin, Tennessee, provides it for Williamson County practices as illustrative arithmetic only, not an offer or an estimate of terms available to you.
What the calculator does
- Amount: the sum financed, after any down payment or equity you put in.
- Interest rate: the annual rate stated in the offer, as a percentage.
- Term: how many monthly payments the loan runs.
It returns the level monthly payment for a fully amortizing loan, the total interest paid over the term, and the total repaid (the amount plus the interest). It does not include fees, does not model balloons or variable rates, and does not compare offers for you.
The formula behind the payment
Let P be the amount, r the monthly rate (the annual rate divided by 12, as a decimal) and n the number of monthly payments:
Monthly payment = P × r ÷ (1 − (1 + r)−n)
Total repaid is the monthly payment times n, and total interest is total repaid minus P. A lender's amortization schedule should give the same payment, give or take rounding.
A check with no interest
Purely to test the arithmetic: a hypothetical $84,000 at zero interest over 84 months gives a payment of $1,000, total interest of $0 and a total repaid of $84,000. Any real rate raises the payment and adds interest; zero is used here only because it is easy to check by hand, not because it resembles an actual offer.
Steps the calculator leaves to you
- Comparing two terms. Run the calculator twice, once per term, and set the two results side by side.
- Equipment with a down payment. Subtract the down payment from the price before entering the amount; add it back to the total repaid by hand to see the full cost.
- Fees. If a fee is deducted from the proceeds, the cash you receive is smaller than the amount financed. Add the fee to the total repaid yourself.
- Practice acquisitions. Enter only the financed portion of the purchase price; seller notes and working capital are separate calculations.
How dental practices use it
Williamson County had 156 dentists' offices with employees in 2023, with an annual payroll of about $107.7 million (U.S. Census Bureau, County Business Patterns 2023). Common uses are equipment upgrades, a second operatory build-out, an associate buy-in and the purchase of an existing practice. Divide the monthly payment by the practice's average monthly collections to see how much of each month's income the loan would take; that step is done by hand.
Why your result may differ from an offer
- Fees financed into the balance, or deducted from the proceeds.
- Interest calculated daily, or on a 360-day year.
- A first payment period longer or shorter than a month.
- Variable rates, interest-only periods or balloons.
Illustrative arithmetic only. Lending partners set actual rates and terms.
After the numbers
Medical and dental practice financing explains how lenders review practices, and business term loans covers covenants and early payoff. The resources section has the other guides.
By Marbleharbor Advances · Updated