Credit Utilisation Calculator
Calculate each revolving account and your combined utilisation, then test a payment, limit increase or zero-balance account closure without predicting a credit score.
Calculate overall and per-card utilisation
| Account | Limit | Reported balance | Utilisation | Flag |
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| Account | Illustrative payment |
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| Account | Limit | Balance | Utilisation |
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Saved portfolios on this device
How credit utilisation is calculated
Direct answer: divide reported revolving balances by revolving credit limits and multiply by 100. ToolBullet calculates each account and the combined ratio, then models payments, limit changes or closing a zero-balance account.
- This is a ratio calculator, not a credit-score simulator.
- Only revolving accounts such as credit cards should be combined; instalment loans use different scoring treatment.
- Reported balances may differ from current app balances because lenders report on their own schedules.
- The target is user-selected. No single percentage guarantees approval or a score change.
Transparent, local what-if modelling
The highest-utilisation-first payment allocation is an illustrative way to distribute the amount needed for the entered overall target. Paying any combination of balances by the same total changes overall utilisation by the same amount, although per-account ratios differ.
Read the credit utilisation guide →
Method reviewed 11 July 2026. Formula, reporting limitations and primary-source context are visible on this page and in the linked guide.
Credit Utilisation Calculator FAQ
What is credit utilisation?
Credit utilisation is the percentage of revolving credit limits represented by reported balances. ToolBullet calculates each account separately and the combined ratio across all entered revolving accounts.
Is 30% a guaranteed credit-score threshold?
No. Thirty percent is a common planning target, not a universal scoring cliff. FICO states that utilisation is evaluated with other credit information and that lower reported utilisation is generally associated with lower risk.
Does paying a card change my score immediately?
Not necessarily. The calculator models balances and limits only. Credit reports update on lender reporting schedules, scoring models differ and no score movement is predicted or guaranteed.
Why can closing a zero-balance card increase utilisation?
Removing an unused credit limit reduces total available revolving credit. If total reported balances stay unchanged, the overall percentage can rise.
Can utilisation exceed 100%?
Yes. A reported balance can exceed a credit limit because of fees, interest, timing or an over-limit balance. ToolBullet shows the calculated ratio without clamping it.
Does the currency selector convert amounts?
No. Currency changes labels and formatting only. Enter all limits, balances and scenario amounts in the same currency.
Are my card balances sent anywhere?
No. Calculations and saved portfolios remain in your browser. ToolBullet analytics records interaction names only, not account labels, balances, limits or results.