What it means
The ratio is deliberately simple: balances divided by limits. It can be calculated on a single card or facility, or across every revolving line a business or individual holds, and both views are useful.
The overall figure shows general dependence on credit, while the per-account figure shows where the pressure actually sits. It matters because it is a behavioural signal rather than an accounting one.
Two businesses can carry identical debt, but the one using 30% of its available lines looks very different to a lender from the one using 90%, because the second has no cushion left if a customer pays late or a supplier demands cash. Available headroom is what turns a bad month into a manageable one.
Scoring models generally treat lower as better, with a common rule of thumb that sustained use below roughly 30% is viewed favourably and above 70% or 80% starts to count against the borrower. That is a guide rather than a rule, and there is no penalty-free threshold: what matters is the trend and whether balances are cleared or merely carried.
Timing is a practical trap. Most lenders report the balance on the statement date rather than an average, so a business that runs a card hard through the month and clears it in full a few days later can still show a high ratio.
Paying down shortly before the statement cuts the reported figure without changing behaviour at all. The ratio can also be improved for the wrong reasons.
Closing an unused card removes its limit from the denominator and pushes the ratio up, while a new limit lowers it without any change in borrowing. Because of that, the figure is best read alongside the absolute balance and the direction of travel over several months.
In practice
Real-world examples.
Example
A retailer applying for a larger overdraft is turned down despite growing profits, because its two business cards have sat above 90% drawn for eleven consecutive months. The lender reads permanent high use as evidence that the cards are funding a structural cash gap rather than short-term timing.
Example
A consultancy clears its company card in full every month but always after the statement date, so it consistently reports 85% utilisation. Moving the payment date three days earlier drops the reported figure below 20% with no change in spending.
Example
A founder closes two unused personal cards to tidy up her finances, cutting total limits from $40,000 to $18,000 while carrying the same $9,000 balance. Her personal utilisation jumps from 22.5% to 50% overnight, weakening a score she needed for a mortgage application.
Formula
Calculation
Credit utilisation ratio = (total balances on revolving credit / total credit limits) x 100. The same formula applies to a single account by using that account's balance and limit.
A small manufacturer holds three revolving lines. A business card has a balance of $4,200 against a $10,000 limit; a second card has a balance of $9,000 against a $15,000 limit; and a revolving working capital line is drawn at $60,000 against a $75,000 limit.
Total balances are $4,200 + $9,000 + $60,000 = $73,200. Total limits are $10,000 + $15,000 + $75,000 = $100,000. Overall utilisation is $73,200 / $100,000 x 100 = 73.2%.
The per-account picture is more revealing: the first card sits at $4,200 / $10,000 = 42%, the second at $9,000 / $15,000 = 60%, and the working capital line at $60,000 / $75,000 = 80%. To bring the overall figure down to 50%, the business would need total balances of $100,000 x 50% = $50,000, requiring a repayment of $73,200 - $50,000 = $23,200. Clearing the smaller card entirely would only move the overall ratio to ($73,200 - $4,200) / $100,000 = 69%, so the repayment has to go against the working capital line to make a real difference.Case study
Seen in the real world.
Bramble Lane Bakery is an invented business used here as an illustrative case. Across two business cards and an overdraft it held $120,000 of limits and had been running at an average of $102,000 drawn, giving utilisation of 85%, while remaining comfortably profitable on revenue of $2,400,000.
When the bakery approached its bank for equipment finance, the application was refused. In this illustrative scenario, the bank's concern was not profitability but the absence of headroom: with only $18,000 of unused facility, a single delayed wholesale payment would have put the business into unauthorised borrowing.
The fictional owners spent two quarters converting $60,000 of the revolving balance into a three-year term loan matched to the equipment it had really funded. Utilisation on the revolving lines fell to ($102,000 - $60,000) / $120,000 = 35%, headroom rose to $78,000, and the equipment finance was approved on the next application even though total debt was almost unchanged.
Watch out
Common mistakes.
- Assuming paying in full each month guarantees a low reported figure. Lenders usually report the statement date balance, so heavy use cleared after that date still shows as high usage.
- Closing unused credit lines to simplify things. Removing a limit shrinks the denominator and pushes the ratio up even though nothing about the borrowing has changed.
- Looking only at the combined figure. One line drawn to 95% is a real problem even when the overall average looks acceptable, so per-account ratios need reviewing too.
Questions
People also ask.
What is considered a good ratio?
Below roughly 30% is generally viewed favourably by lenders and scoring models, though the trend over several months matters more than any single reading.
Does a higher credit limit improve the ratio?
Mathematically yes, because the denominator grows, but lenders look at balances and repayment behaviour as well, so a new limit alone changes little in substance.
Do term loans count in the calculation?
No, the ratio applies to revolving credit such as cards, overdrafts and revolving facilities, since fixed-term loans have no undrawn limit to measure against.
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