Estimate interest costs for revolving credit using draw amount, APR, and repayment timing.
Enter your values
Open the Line of Credit Interest Calculator and fill in the required input fields with your numbers or selections.
Review the calculation
The tool automatically computes the result as you type. Double-check your inputs to ensure accuracy.
Interpret your results
Review the calculated output along with any breakdowns, charts, or explanations provided to understand what the numbers mean for your situation.
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Maximum available credit line
Amount you plan to draw from the line
Variable or fixed annual rate
Months you'll use the credit (interest-only)
Months to pay back the principal
A business line of credit works differently from a traditional term loan. Instead of receiving a lump sum upfront, you get access to a revolving credit facility and only pay interest on the amount you actually draw. This flexibility makes lines of credit ideal for managing cash flow gaps, seasonal inventory needs, and unexpected expenses.
During the draw period, most lines of credit require interest-only payments on the outstanding balance. The formula is straightforward:
Monthly Interest = Amount Drawn x (Annual Rate / 12)
Once the draw period ends, you enter the repayment phase where you pay back both principal and interest, typically on an amortized schedule.
Your utilization rate (amount drawn divided by credit limit) affects your cost efficiency. A lower utilization rate means you are paying less interest relative to your available credit. However, consistently low utilization may signal to lenders that you do not need the full credit line, potentially affecting future renewals.
Draw only what you need, repay as quickly as possible, and monitor your utilization rate. Many businesses use a line of credit as a safety net while relying on operating cash flow for day-to-day expenses. Remember that the interest rate on a line of credit is often variable, so factor in potential rate increases when planning your costs.