What actually goes into a credit score

A credit score isn't a mystery — it's five ingredients, each with a rough weight. Once you know which parts carry the most weight, you know where to spend your effort.

The most widely used credit scores, from FICO, are built from five categories. The exact math is proprietary and your score can shift with your full credit profile, but the approximate weights below are well established and give you a reliable map of what matters most.

1. Payment history — about 35%

This is the big one. It's simply your track record of paying what you owe on time. A single payment that slips 30 or more days past due and gets reported can take a real bite out of your score, and the mark can linger for years. On the flip side, a long, unbroken run of on-time payments is the strongest positive signal you can send.

The practical takeaway: if you do only one thing for your credit, never miss a due date. Automatic minimum payments are a simple safety net — you can always pay more manually, but the autopay guarantees you're never late by accident.

2. Amounts owed / utilization — about 30%

This is mostly your credit utilization — how much of your available revolving credit you're using. Lower is better; keeping it under 30%, and ideally in the single digits, signals you're not overextended. Because this updates as your reported balances change, it's one of the faster-moving factors and a common place to find quick improvement.

3. Length of credit history — about 15%

This looks at how long you've had credit: the age of your oldest account, the average age of all your accounts, and how long specific accounts have been open. Older is better, because a longer history gives lenders more to judge you by. This is the one factor time handles for you — but you can help it by keeping old accounts open. Closing your oldest card can shorten your average account age and remove its limit from your utilization math at the same time.

4. Credit mix — about 10%

Lenders like to see that you can responsibly handle different types of credit — revolving accounts like credit cards, and installment accounts like auto loans, student loans, or a mortgage. A varied mix reads as versatility. That said, this is a small slice of the score, so it's never worth taking on debt you don't need just to diversify. Let your mix grow naturally as your financial life does.

5. New credit — about 10%

Opening several new accounts in a short window can look risky, and each application usually triggers a "hard inquiry" that can shave a few points temporarily. The effect is small and fades within months, so one new account when you need it is nothing to fear. The caution is against applying for lots of credit all at once. (Checking your own score is a "soft inquiry" and does not hurt it.)

Score ranges at a glance

Most FICO scores fall on a 300–850 scale. Rough bands:

• 800–850 — exceptional
• 740–799 — very good
• 670–739 — good
• 580–669 — fair
• 300–579 — poor

Lenders set their own cutoffs, so there's no single number that guarantees approval for anything. But higher scores generally unlock better interest rates, which can save real money over the life of a loan.

A realistic timeline

Credit improvement is a slow, steady process, not an overnight fix. Utilization changes can show up within a billing cycle or two. Rebuilding after missed payments takes longer, because time and a fresh run of on-time payments are what heal payment history. Anyone promising to "fix" your score instantly is worth treating with skepticism.

Understand these five factors and you understand your score. Focus your energy where the weight is — paying on time and keeping balances low — and let the slower factors build in the background.

This article is for general educational purposes and is not financial advice. Scoring models and their weights vary; the percentages above are approximate. See our full disclaimer.