Prairiebank Loans, a small-business funding service in Florence, AZ, offers this loan calculator for contractors and builders in Pinal County, AZ. Enter an amount, an annual rate and a term in months to estimate the monthly payment, total interest and total repaid. It is an estimate only; partners set actual rates, amounts and terms after reviewing a request.
What this business loan calculator does
It is a standard business loan amortization calculator. You enter three numbers: the amount, the annual rate and the term in months. It returns three: the business loan monthly payment, the total interest over the term, and the total repaid. Behind it sit two assumptions: level monthly payments and one fixed rate throughout.
The rate box takes whatever you type. It is not a quote, and Prairiebank does not publish typical rates; a real rate comes only from a partner after it reviews a request.
Reading the results for a construction company
Two comparisons are worth running. First, keep the amount and rate the same and change the term: stretching the term trims the monthly payment but adds to the total interest. Second, keep the term the same and change the amount: this shows how much monthly payment each extra dollar of borrowing adds. For a contractor, the payment matters most in the slow months between jobs, so test it against your thinnest month, not your strongest one.
Draw gaps, retainage and other sums to do on paper
Size the draw gap first
Business loans for a construction company are easier to size when you know the gap. List each week's costs (materials, payroll, equipment, insurance) until the next draw clears, subtract each draw as it lands, and find the low point. That shortfall is the amount to test.
Account for retainage
If 10% of each draw is held as retainage, use the net amount when you map the draws. Retainage released at closeout can repay a short-term balance, but only if it actually arrives on time.
Compare with a draw-based repayment
This calculator assumes fixed monthly payments. Working capital for a construction company, or a line of credit, may be repaid as draws arrive instead. Model that by hand: list the draw dates and amounts beside the balance owed.
Weekly or daily payments
Some short-term products collect weekly or daily. This calculator works in months only, so ask a partner how often a real payment would be collected and how much it would be.
Construction business loan calculator inputs
- Loan amount: the shortfall you sized by hand, not a round number.
- Annual rate: any figure you want to test; actual rates come from partners.
- Term in months: try two or three terms to see the trade-off between payment and total interest.
Where to go next
Draws, retainage and equipment are covered on the contractor funding page; one-time projects on business term loans. The permits guide, the local help directory and the calculator are on the Prairiebank resources page.
By Prairiebank Loans · Updated
