Credit utilization is the ratio of your credit card balances to your credit limits. It's one of the most important factors within the "Amounts Owed" category of your FICO score. The "Amounts Owed" category generally represents approximately 30% of the FICO calculation, and credit utilization is one factor within that category.
How Utilization Is Calculated
Your utilization is calculated two ways:
- •Per-card utilization — The balance on each individual card divided by that card's limit
- •Overall utilization — Total balances across all cards divided by total credit limits
FICO looks at both. A single maxed-out card can hurt your score even if your overall utilization is low.
Example: If you have two cards with $1,000 limits each and carry $500 on one card, your per-card utilization is 50% (on the card with a balance) but your overall utilization is 25% ($500 / $2,000 total credit).
Why the 30% Rule Exists
"Keep utilization below 30%" is a commonly cited rule of thumb, not a FICO scoring rule. There is no universally optimal utilization percentage that applies to every consumer; the effect of utilization on a score depends on the individual's overall credit profile and other factors. The 30% figure is a widely shared guideline, but it is not a hard threshold, cutoff, or universal rule.
Generally, lower utilization is better for FICO scores. Moving from 31% to 29% does not automatically produce a specific score improvement — the effect depends on the consumer's overall credit profile and other factors. People with the highest scores tend to have low utilization, but no single percentage guarantees a particular score.
Very low reported utilization, including 0%, can be consistent with strong scores. Some credit-scoring guidance suggests that 0% utilization is not necessarily optimal for maximizing points in the amounts-owed category, but consumers do not need to carry an interest-bearing balance or pay interest for this purpose. Paying the statement balance in full each month while using the card regularly still establishes payment history.
Strategies to Keep Utilization Low
Pay Before the Statement Date
Utilization is calculated using balances and credit limits reported to the credit bureaus. The reported balance may differ from the current balance you see in your issuer's app. Many issuers report the balance shown on your statement, but reporting practices can vary by issuer — not every issuer reports on exactly the statement-closing date. If you pay your balance down before the statement closes, a lower balance may be reported, which can reduce your reported utilization.
Request Credit Limit Increases
Increasing your credit limit (without increasing your spending) instantly lowers your utilization ratio. Most issuers will review limit increase requests every 6-12 months. A clean payment history may help, but approval depends on the issuer's criteria and your overall credit profile.
Spread Spending Across Multiple Cards
If you need to make a large purchase, spreading it across multiple cards prevents any single card from showing high utilization.
Keep Old Cards Open
Closing a credit card reduces your total available credit, which raises your utilization ratio. Keep old accounts open, especially if they have no annual fee.
The Temporary Utilization Strategy
If you're applying for a major loan (mortgage, auto) soon, paying down credit card balances in the weeks before applying may result in a lower reported utilization, which could help your credit profile. Whether this produces a meaningful score change depends on your overall credit profile, and a lower interest rate is not guaranteed.
Sources & References
The following resources provide authoritative information on credit scoring factors and credit utilization.
- •myFICO — What is a FICO® Score and why is it important?
- •Consumer Financial Protection Bureau (CFPB) — What is a credit score?
- •Consumer Financial Protection Bureau (CFPB) — What are some ways to start or rebuild a good credit history?
Final Thoughts
Credit utilization is one of the more actionable factors in your credit score. Unlike payment history (which reflects years of behavior), reported utilization can change as new balances are reported. Paying down balances and keeping utilization low can help your credit profile over time, though the effect on any individual's score depends on their overall credit history.