What Is a Credit Score? How UK Scores Are Calculated

If you've ever checked your credit report, you've probably seen a three-digit number and wondered: what does this actually mean? That number is your credit score. Understanding what goes into it, and how lenders use it, is one of the most useful things you can do before applying for any form of credit.

What is a credit score?

A credit score is a numerical summary of the information on your credit report. It's designed to give lenders a quick indication of how you've managed credit in the past, so they can assess the risk of lending to you. The higher the score, the more likely a lender is to see you as a lower-risk borrower.

It's worth being clear from the start: your credit score is not a fixed number stored in a central database. Each of the three main UK credit reference agencies (CRAs) calculates its own score using its own formula, and the scores can vary between them because they may hold slightly different data about you.

The three main UK credit reference agencies

There are three CRAs operating in the UK: Experian, Equifax, and TransUnion. Each one collects information from lenders, utility providers, mobile phone companies, the electoral register, and public records such as court judgments. You can learn more about how they operate in our guide on how credit reference agencies work in the UK.

The important thing to know is that each agency uses a different scoring range:

• Experian: scores range from 0 to 999
• Equifax: scores range from 0 to 1,000
• TransUnion: scores range from 0 to 710

This means a score of 600 from TransUnion is strong, while a 600 from Experian sits in the middle of the range. Context matters more than the raw number.

How is a credit score calculated?

While each agency's formula is proprietary and not publicly disclosed, the broad factors that influence your score are well understood. Here's what typically matters:

• Payment history: whether you've made repayments on time is the single biggest factor. Late or missed payments stay on your file for six years and can pull your score down.
• How much credit you're using: if you're close to your credit limits on cards or overdrafts, it can signal to lenders that you're already stretched. This is called your "credit utilisation".
• Length of credit history: a longer track record of managing credit responsibly generally supports a higher score. If you're new to credit, there's simply less data to judge you on.
• Types of credit used: having a mix of different types (a credit card, a mobile phone contract, a loan) can show that you can handle various forms of credit, but this is a smaller factor.
• Recent applications: each time you apply for credit and a hard search is recorded on your file, it can temporarily lower your score. Multiple applications in a short window can be a red flag for lenders.
• Public records: things like County Court Judgments (CCJs), Individual Voluntary Arrangements (IVAs), or bankruptcy orders have a significant negative impact. Read our guide on what a CCJ is and how it affects borrowing for more detail.

What a credit score does (and does not) tell lenders

Your credit score is a starting point, not a final verdict. Lenders rarely look at your score in isolation. They'll typically look at your full credit report, alongside your income, outgoings, employment status, and the specific amount you want to borrow. This is called an affordability assessment, and it's required by FCA rules. Our guide on how lenders assess affordability walks through the full process.

Mini Money is a credit broker, not a lender. We connect you with a panel of regulated lending partners, and each lender makes its own decision based on its own criteria. A higher credit score improves your chances of being matched with more options, but it does not guarantee acceptance, and a lower score does not mean you definitely won't be offered anything at all.

Why do different agencies show different scores?

It's common for someone to check their score on two different platforms and see two different numbers. This doesn't mean either is wrong. Because each CRA may hold slightly different data (not every lender reports to all three), and each one weights factors differently, variation is normal. The important thing is the general direction: if both scores are broadly in the same category (fair, good, excellent within their respective scales), your credit profile is consistent.

Can you have no credit score at all?

Yes. If you've never taken out credit, never had a mobile phone contract, never opened a bank account with an overdraft, and are not on the electoral register, there may not be enough information to produce a meaningful score. This is sometimes called being "credit invisible". It does not mean you've done anything wrong. It just means there is no data for the agencies to score you on. Building a credit history takes time, and taking small steps like registering to vote and using a credit-builder card responsibly can help.

How to check your credit score

You have a legal right to access your statutory credit report from each of the three main CRAs, and several services offer free access to your report and score. Checking your own credit score is a soft search and does not affect your score. It's worth doing this before applying for credit so you can spot any errors or outdated information that might be pulling your score down. If you're planning to apply for a loan soon, you may also find our guide on how to improve your credit score before applying useful.

The bottom line

Your credit score is a helpful snapshot, not the whole picture. Lenders look at far more than a three-digit number, and the most important things you can do are straightforward: pay on time, keep your credit utilisation low, check your report for errors, and only apply for credit you genuinely need and can afford. If you're concerned about your financial situation or struggling with debt, free independent help is available at moneyhelper.org.uk.