Credit Utilization Calculator
Calculate per-card and aggregate credit utilisation, and see exactly what payment or credit-limit increase brings each card down to your target ratio.
Your cards
Per-card breakdown
| Card | Balance | Limit | Utilisation | Pay to hit target | Or raise limit by |
|---|---|---|---|---|---|
| Everyday card | $1,850.00 | $5,000.00 | 37.0% | $350.00 | $1,166.67 |
| Travel card | $620.00 | $8,000.00 | 7.8% | $0.00 | $0.00 |
| Store card | $410.00 | $1,200.00 | 34.2% | $50.00 | $166.67 |
| All cards | $2,880.00 | $14,200.00 | 20.3% | $0.00 | $0.00 |
What to do next
- To bring aggregate utilisation to 30%, pay down $0.00 in total — every dollar has the same effect on the aggregate figure no matter which card it lands on, because the denominator is your combined limit.
- A credit-limit increase of $0.00 across your cards reaches the same aggregate figure without paying anything down.
- The card most worth attacking first is Everyday card at 37.0%. Per-card utilisation is reported separately to the bureaus, so clearing the worst card is what moves the individual-account picture.
- 2 cards are currently above your target.
Per-card utilisation = balance ÷ credit limit; aggregate utilisation = total balances ÷ total limits. A card with a zero or blank limit shows an em dash and is left out of the aggregate rather than dividing by zero. The payment that reaches a target is balance − limit × target, and the equivalent limit increase is balance ÷ target − limit. Scoring models use the balance that was reported on your statement, not today’s balance, so paying before the statement date is what shows up. Everything is calculated in your browser and no card details are uploaded. Estimates for planning, not credit advice.
What is the Credit Utilization Calculator?
The ByteTools Credit Utilization Calculator works out what share of your available credit you are using, both on each individual card and across all of them together.
- Per-card and aggregate utilisation calculated together
- The exact payment and the equivalent credit-limit increase for any target
- Colour-coded bands at 10%, 30% and 50% utilisation
- A card with a zero or blank limit shows an em dash and is excluded from the aggregate
- Highlights the highest-utilisation card as the one worth attacking first
- Counts how many cards currently sit above your target
How to use the Credit Utilization Calculator
- 1
Set your target utilisation percentage — 30% is the usual rule of thumb, 10% is stronger.
- 2
Add each card with its current balance and its credit limit.
- 3
Read the aggregate utilisation, total balances, total limits and available credit.
- 4
Use the per-card table to see which cards are above target and what each needs.
- 5
Follow the next-steps panel for the total payment or limit increase that reaches your target.
About the Credit Utilization Calculator
The ByteTools Credit Utilization Calculator works out what share of your available credit you are using, both on each individual card and across all of them together. Enter balances and limits, set a target ratio, and it shows the payment that gets each card there and the credit-limit increase that would achieve the same result without paying anything.
Scoring models look at both the aggregate figure and each card separately, so the tool reports them side by side and colour-codes the bands. It also tells you plainly that every dollar paid moves the aggregate ratio identically no matter which card receives it, which is the part most guides get wrong.
Balances and limits are entered and calculated entirely in your browser — no card details are uploaded, stored or transmitted anywhere. These are planning estimates rather than credit advice, and no calculator can predict a score change.
Frequently asked questions
How do you calculate credit utilization?
Divide the balance by the credit limit and multiply by 100. Do it per card and again across every card combined: balances of 1,850, 620 and 410 against limits of 5,000, 8,000 and 1,200 give an aggregate of 2,880 ÷ 14,200 = 20.3%.
What is a good credit utilization ratio?
Under 30% is the widely quoted guideline, and under 10% is generally better still for scoring purposes. There is no cliff edge at any particular number — lower is steadily better, and the ratio is recalculated every time your issuer reports a balance.
Which card should I pay down first to lower utilization?
For the aggregate figure it makes no difference: every dollar reduces total balances against the same combined limit. Since per-card utilisation is reported separately too, paying down your highest-utilisation card is what improves the individual-account picture, which is what this tool highlights.
Does a credit limit increase lower utilization?
Yes, because it raises the denominator. The calculator shows the increase that reaches your target without paying anything down. Bear in mind that some issuers run a hard credit check for an increase, and a higher limit only helps if the balance does not grow with it.
When is my utilization actually reported?
Issuers usually report the balance shown on your statement, not the balance today, so paying down before the statement closes is what shows up on your report. Paying the full balance after the statement date still avoids interest but may leave a high reported figure.
Are my card balances kept private?
Yes. Everything is calculated in your browser and no balance, limit or card name is uploaded or saved anywhere.
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