This worksheet shows how to calculate business line of credit utilization (balance divided by limit) and remaining headroom by hand, across one or several lines. The calculator computes a monthly payment, total interest and total repaid for an amount, rate and term. Lakeshire Business Funding, a small-business funding broker in Duluth, Minnesota, provides both as arithmetic only.
The utilization formula
Utilization = drawn balance ÷ credit limit × 100
Headroom = credit limit − drawn balance
Use the balance on a single date, such as a statement date, and the limit in force on that date. For an asset-based line whose limit moves with a borrowing base, use the current available limit rather than the maximum in the agreement.
Worked by hand: three lines, hypothetical figures
| Line | Limit | Balance | Utilization | Headroom |
|---|---|---|---|---|
| Bank line | $50,000 | $32,000 | 64% | $18,000 |
| Supplier-linked line | $20,000 | $4,000 | 20% | $16,000 |
| Business card | $10,000 | $7,500 | 75% | $2,500 |
| All lines combined | $80,000 | $43,500 | 54.4% | $36,500 |
Combined utilization is total balances divided by total limits ($43,500 ÷ $80,000), not the average of the three percentages. Look at both: a modest combined figure can hide one line that is nearly maxed out.
A planned draw, by hand
Suppose the same business plans to draw $12,000 on the bank line for a materials order. The bank line's balance would rise to $44,000, so its utilization would be $44,000 ÷ $50,000 = 88 percent and its headroom would fall to $6,000. Combined utilization would rise to $55,500 ÷ $80,000, about 69.4 percent. Write the same three lines for your own figures before any large draw.
Using the calculator for a draw you will repay in installments
Some lines repay draws in equal monthly installments, and some owners plan to pay a draw down on a fixed schedule even when the line does not require it. Enter the draw amount, the annual rate in your line agreement and the number of months you plan to take, and the calculator returns the monthly payment, total interest and total repaid. For a line that charges interest only on a balance you pay down irregularly, the result is an approximation; the calculator does not compute utilization.
Is a line of credit included in credit utilization?
It depends on who reports what. Some business lenders report to business credit bureaus, some report to personal bureaus when an owner is personally liable, and some do not report routine balances at all. Ask your lender how the line is reported. This page makes no claim about how utilization affects any credit score.
How much of a line of credit should a business use?
There is no single right number. Lenders tend to look at the pattern: a line drawn for a purpose and paid down as revenue arrives reads as working capital, while one that stays near its limit for months reads as debt the business cannot clear. If utilization stays high, working capital financing or a term structure may suit the need better. The renewal guide explains how usage is reviewed, the line of credit page explains how lines work, and the guide library has the rest.
By Lakeshire Business Funding · Updated
