How the ratio is worked out
Utilization is a plain ratio. A $1,200 balance on a $3,000 limit is 40%. The overall figure adds up all balances and all limits, so one card with a large limit and a small balance pulls the average down. Credit scoring models generally look at both the overall figure and individual cards, and lower is generally viewed more favorably.
Utilization = balance / credit limit. Overall utilization = total balances / total limits. Target balance = limit x target percent. Paydown = current balance - target balance, but never below zero. The bands on this page (10% or less, 30% or less, up to 50%) are common rules of thumb. Scoring models do not publish exact cutoffs.
A worked example
A student has three cards. Card A owes $1,200 on a $3,000 limit. Card B owes $450 on a $5,000 limit. Card C is at zero with a $2,000 limit. The goal is to get to 10%.
| Card | Utilization | Balance at 10% | Pay down |
|---|---|---|---|
| Card A | 40.0% | $300 | $900 |
| Card B | 9.0% | $500 | $0 |
| Card C | 0.0% | $200 | $0 |
| Overall: $1,650 of $10,000 | 16.5% | $1,000 | $650 |
Overall utilization is 16.5%. Getting the overall figure to 10% needs a $650 paydown, since the total balance must fall from $1,650 to $1,000. Getting every single card to 10% needs $900, because Card A is the only one above the line and it needs the whole $900 on its own. Both numbers are useful, depending on which measure matters for you.
Using the numbers
Issuers report balances to the credit bureaus once a month, often on the statement date. The balance that gets reported is usually the statement balance, even if you pay it in full a few days later. That is why a person who pays every bill in full can still show a high ratio, and why paying down a card before the statement closes can lower it.
Credit limits matter as much as balances. Closing an unused card removes its limit and raises overall utilization even though nothing was spent. The ratio is one of several things a score reflects, so use the tool to understand how your balances look to a lender, and not as a promise about a specific score.
Common mistakes
- Looking only at the overall ratio when one card is nearly maxed out.
- Closing an old card to tidy up, which cuts the total limit and raises the ratio.
- Assuming a paid-in-full card shows zero. The statement balance is what usually gets reported.
- Counting a cash advance or a new charge after the statement date as part of this month's ratio. Timing matters.
- Treating 30% as a safe target. Lower is generally better, and 30% is a rule of thumb.
Estimate for learning, not financial advice. Inputs stay in your browser and are not sent or stored.