How Credit Scores Are Calculated
FICO scores — used in the vast majority of US lending decisions — are calculated from five factors, each weighted differently. Knowing the weights tells you exactly where to focus your efforts.
| Factor | Weight | What It Measures |
|---|---|---|
| Payment history | 35% | Whether you pay on time, every time |
| Credit utilisation | 30% | How much of your available credit you're using |
| Length of credit history | 15% | How long your accounts have been open |
| Credit mix | 10% | Variety of account types (cards, loans, mortgage) |
| New credit | 10% | Recent applications and hard inquiries |
Source: myFICO.com. Weights apply to FICO Score 8, the most widely used model. VantageScore weights vary slightly.
Two factors — payment history and utilisation — make up 65% of your score. If you get those right consistently, the other three take care of themselves over time.
7 Methods to Build Your Credit Score
1. Pay Every Bill on Time, Every Time
This is non-negotiable. One payment that's 30 days late can drop an excellent score by 100 points or more. Set up autopay for at least the minimum payment on every account so you never miss a due date. If you miss a payment, catch up immediately — the damage from a 30-day late is bad; a 60-day late is significantly worse.
2. Keep Credit Utilisation Low
Utilisation is your total credit card balance divided by your total credit limit. If you have a $5,000 limit and carry a $2,500 balance, you're at 50% — too high. Aim for below 30% overall, and below 30% on each individual card. Below 10% is optimal for the highest scores. The simplest fix: pay balances down before the statement closing date, since that's when issuers report to credit bureaus.
3. Don't Close Old Accounts
Closing a credit card reduces your total available credit (raising utilisation) and can shorten your average account age. Both hurt your score. If an old card has no annual fee, keep it open and use it for one small purchase every few months to prevent the issuer closing it for inactivity.
4. Apply for New Credit Sparingly
Each credit application triggers a hard inquiry, which typically shaves 5 points off your score temporarily. Multiple applications in a short period signal financial stress to lenders. Apply only when you genuinely need new credit — don't open multiple cards at once just to increase your available limit.
5. Use a Secured Credit Card if You're Starting from Zero
If you have no credit history or a score below 580, a secured credit card is the most accessible starting point. You provide a cash deposit (typically $200–$500) that becomes your credit limit. Use it for small purchases, pay the full balance monthly, and the positive payment history reports to all three bureaus. Most people can qualify for an unsecured card within 12–18 months of responsible secured card use.
6. Become an Authorised User
If a family member has a long-standing credit card account with a good payment history and low utilisation, ask to be added as an authorised user. The account's positive history will appear on your credit report — even if you never use the card. You don't need to have access to the physical card for this to work. This is one of the fastest ways to gain credit history quickly.
7. Check Your Credit Report for Errors
Errors on credit reports are more common than most people realise. A 2024 study by the Consumer Financial Protection Bureau found that many consumers have inaccuracies on their reports that, if corrected, would raise their scores. Get your free reports from all three bureaus at AnnualCreditReport.com. If you find an error — an account that isn't yours, a late payment incorrectly recorded — file a dispute with the bureau directly. Corrections can improve your score within 30–60 days.
How Long Does It Take?
Credit building is not instant, but the timeline is predictable:
- No credit history → basic score: 3–6 months of account activity
- Poor (below 580) → fair (580–669): 12–18 months of on-time payments
- Fair → good (670–739): 12–24 months, depending on starting point
- Good → very good (740–799): 2–4 years of consistent responsible use
- Very good → exceptional (800+): 5+ years; requires long history, low utilisation, no missed payments
Negative items like late payments and collections stay on your report for 7 years, but their impact diminishes significantly after 2–3 years as new positive history builds up.
Common Mistakes That Hurt Your Score
Paying only the minimum. Minimum payments keep your account current but do nothing to reduce utilisation. Carrying a high balance month to month is what damages your score, not the act of having a card.
Closing a card after paying it off. This feels satisfying but increases your utilisation ratio and shortens your credit history. Keep it open, use it occasionally.
Co-signing for someone with poor financial habits. If they miss payments, it damages your score just as much as if you missed them yourself. Co-signing means full responsibility.
Applying for multiple cards quickly. Several hard inquiries in a short period signals financial distress, even if each application is individually reasonable.
Credit Scores in the UK, India, and Canada
UK: The UK has three main credit reference agencies — Experian, Equifax, and TransUnion (formerly Callcredit). Each has its own scoring scale and method. Unlike the US, there's no universal FICO equivalent. Lenders access these reports directly and make their own decisions — a score that looks good with Experian might be viewed differently by another lender using TransUnion. You can check your score free at Experian, Equifax UK, or via Credit Karma (TransUnion). The same core principles apply: pay on time, keep utilisation low, maintain old accounts.
India: India's primary credit bureau is CIBIL (now TransUnion CIBIL), which generates the CIBIL Score on a 300–900 scale. A score above 750 is considered good and typically qualifies for the best loan and credit card terms. Equifax, Experian, and CRIF High Mark also operate in India. You're entitled to one free CIBIL report per year at cibil.com. The same fundamentals apply — payment history and credit utilisation are the dominant factors. India's credit ecosystem is growing rapidly as more people gain access to formal credit.
Canada: Canada's two main credit bureaus are Equifax Canada and TransUnion Canada. Canadian credit scores range from 300–900, and a score above 660 is generally considered good. Credit Karma offers free score monitoring via TransUnion Canada. The FCAC (Financial Consumer Agency of Canada) provides guidance at canada.ca. Building credit in Canada works the same way as the US — secured cards, on-time payments, and low utilisation are the core tools.