Credit Utilisation Calculator

The credit utilisation calculator above shows you exactly what percentage of your available credit you are currently using, in seconds. It takes the balances on your credit cards and revolving accounts, compares them against your credit limits, and returns your credit utilisation ratio as a single, clear figure. Because this number is one of the biggest movable factors in your credit score, knowing it (and being able to test changes before you make them) puts you firmly in control.

What this calculator does

This tool answers one practical question: how much of your borrowing headroom are you actually using right now? Lenders and credit reference agencies pay close attention to this because someone who routinely maxes out their cards looks riskier than someone who keeps plenty of room spare, even if both people pay on time.

Specifically, the calculator gives you:

• Your overall utilisation — total balances across all cards divided by your total credit limits.
• Per-card utilisation — so you can spot a single card that is dragging your figure up.
• A rating band — whether your usage sits in the excellent, good, fair or high range.

It is a planning tool. You can enter hypothetical numbers, for example a balance after a planned payment, to see how a repayment would shift your ratio before you commit a single penny. Unlike simply glancing at one card balance, the calculator does the awkward arithmetic of combining several accounts with different limits, which is where most people lose track of where they really stand.

How to use the credit utilisation calculator

You only need two pieces of information per account: the balance and the credit limit. Both appear on your statement or in your banking app.

1. Gather your figures. List every credit card and revolving credit account you hold, along with its current balance and its assigned credit limit.
2. Enter each card. Type the balance and limit into the relevant fields. Add a row for every card so the overall figure reflects your whole picture, not just one account.
3. Read your overall ratio. The calculator instantly returns your combined utilisation as a percentage.
4. Check each card individually. Look down the per-card breakdown to find any account that is running hot.
5. Test a change. Lower a balance figure to model a payment, and watch how the percentage drops. This is the quickest way to see how much you would need to repay to reach a target band.

Tip: include your full limit even on cards you rarely use. An unused card with a healthy limit actually helps your overall ratio, because it adds available credit without adding any balance.

The formula: how the number is worked out

The maths behind your credit utilisation ratio is straightforward:

Utilisation (%) = (Balance ÷ Credit limit) × 100

So a £500 balance on a card with a £2,000 limit gives (500 ÷ 2,000) × 100 = 25%.

Overall versus per-card

There are two ways to look at this, and both matter:

• Overall (aggregate) utilisation adds up all your balances and divides by the sum of all your limits. This is the headline figure most scoring models weigh most heavily.
• Per-card utilisation applies the same formula to each card on its own. Even if your overall figure looks comfortable, a single card sitting near its limit can still be a red flag to some lenders.

The calculator works out both so you are not caught out by a card that looks fine in the average but is maxed in isolation.

What to include and what to leave out

Include every account where you have a credit limit you can draw down and repay repeatedly: credit cards, store cards and charge cards. Some people also factor in an arranged overdraft, treating the agreed limit as the ‘credit limit’ and the amount used as the ‘balance’. What you should not include are fixed-term products such as personal loans, hire purchase, mortgages or car finance — these have no revolving limit, so they do not form part of a utilisation calculation. Keeping the inputs consistent is what makes the percentage meaningful.

What counts as good credit utilisation?

The widely quoted 30% rule says you should aim to keep utilisation below 30% of your available credit. It is a sensible ceiling, but it is a floor for safety rather than a target to aspire to. The lowest risk profiles tend to sit in single digits. Keeping a small balance showing (rather than exactly zero) can also demonstrate active, responsible use.

These bands are guidance, not hard cut-offs — different lenders and scoring models weight the number differently. As a rule of thumb: under 30% is good, and under 10% is ideal.

A worked example

Imagine you hold three cards:

• Card A: £900 balance, £3,000 limit → 30% per-card
• Card B: £200 balance, £2,000 limit → 10% per-card
• Card C: £0 balance, £1,000 limit → 0% per-card

Total balances are £1,100 and total limits are £6,000. Your overall utilisation is (1,100 ÷ 6,000) × 100 = 18.3% — comfortably in the ‘good’ band.

Now suppose you pay £600 off Card A. Its balance drops to £300 (10% per-card) and your total balances fall to £500. Your overall ratio becomes (500 ÷ 6,000) × 100 = 8.3% — now in the ‘excellent’ range. Modelling that exact move in the calculator above takes a few seconds and shows you precisely how much repayment shifts the dial.

Notice something about Card A in the original example: at 30% it sits right on the edge of the ‘good’ band even though your overall figure of 18.3% looks healthy. This is exactly why the per-card view matters. If you only had £600 spare, putting it against Card A (the hottest card) does more for how a cautious lender reads your file than spreading the same £600 thinly across all three. The calculator lets you trial both approaches and compare the results side by side.

How your statement date changes the figure lenders see

Here is the detail that surprises most people: the utilisation lenders see is usually the balance reported on your statement date, not the balance after you pay the bill. Your card issuer typically reports to the credit reference agencies once a month, around the time your statement is generated.

That means you can pay your statement in full every month and still show high utilisation — if you spend heavily and the statement closes before your payment lands. Two practical takeaways:

• Pay before the statement date, not just before the due date, if you want a lower figure reported.
• Watch big one-off purchases. A large spend that happens to be on the card when the statement closes can spike the reported number for that month, even if you clear it days later.

The calculator reflects whatever balance you enter, so for the most realistic picture, use the balance as it stood (or will stand) on your statement date.

Practical ways to lower your credit utilisation

If your result is higher than you would like, here are reliable levers, roughly in order of speed:

1. Make an extra payment before the statement closes. The fastest way to cut the reported figure without waiting a full billing cycle.
2. Spread the balance across cards. Moving spend so no single card sits near its limit improves your per-card picture.
3. Ask for a credit limit increase. A higher limit on the same balance lowers utilisation instantly — provided you do not then spend the extra headroom.
4. Keep older cards open. Closing a card removes its limit from the total, which can push your ratio up overnight.
5. Pay more than the minimum. Minimum payments barely move the balance; larger repayments cut both interest and utilisation.
6. Avoid opening and immediately maxing new cards. A fresh card briefly lowers your overall ratio by adding a limit, but loading it up straight away undoes the benefit and adds a high per-card figure.

A useful habit is to set a personal ceiling well below your limit — many people aim to never let any card pass the 30% mark, then chase single digits over time. Re-running the calculator each month, ideally a day or two before each statement closes, turns this from a vague intention into a number you can actually track.

Once your balances are under control, it is worth seeing how the improvement might ripple through your wider profile with our Credit Score Estimator, and checking how your borrowing sits against your income using the Debt-to-Income Ratio Calculator.

Frequently asked questions

Does the calculator save or share my figures?

No. The calculation runs from the numbers you type in, purely to show your ratio. It is designed for quick, private ‘what if’ testing, so feel free to experiment with different balances and limits.

Should I include my mortgage or car finance in this?

No — credit utilisation applies only to revolving credit such as credit cards, store cards and some overdrafts, where you have a limit you can draw against repeatedly. Instalment loans like mortgages and car finance have a fixed term and are measured differently, which is where a debt-to-income view is more useful.

My overall figure looks fine but one card is high — does that matter?

It can. Some lenders look at the worst individual card as well as the average, so a single account near its limit may still count against you. Use the per-card breakdown to even things out where you can.

Want the full background on why this number carries so much weight and how the agencies treat it? Read our complete guide, Credit Utilisation Explained.

This tool is general information, not personal financial advice.