Business line of credit cost calculator

Estimate what a single draw on a business line of credit costs, including draw fees and the weekly or monthly payment.

LoansUpdated November 2026Reviewed by the Loanistry editorial teamHow we rateHow we make money
Estimated weekly payment
—/wk
Interest on this draw—
Draw fee—
Effective APR with fee—
Total cost of this draw—
Total repaid—

Weekly amortization at the stated rate. Fee-based lines (flat weekly fees) should be converted to an annual rate first.

In short

The cost of a line of credit draw depends on the amount drawn, the repayment term and the rate or fee. A $25,000 draw repaid over 26 weeks at 20% simple interest costs about $1,230 in interest, or roughly $1,000 a week. Draw fees of 1% to 2% add to that. Enter your draw to estimate the payment and total cost.

How to use this calculator

Draw amount

You pay interest only on what you draw, not on the full credit line.

Repayment term

Each draw has its own schedule, commonly 12, 26 or 52 weeks.

Rate

Enter the simple interest rate or APR quoted. For fee-based lines such as Fundbox, convert the plan fee to an annual rate first.

Draw fee

Some lenders charge 1% to 2% of each draw.

Fewer, larger draws cost less than many small ones when there is a draw fee.
A line you never draw costs nothing at most online lenders. Open it before you need it.

Frequently asked questions

How is interest charged on a business line of credit?
Only on the outstanding balance, usually as simple interest accruing weekly or monthly, or as a flat fee per draw spread over the repayment plan.

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