How your credit score is calculated and how to improve it

Your credit score affects more than just your ability to get a loan. It influences your mortgage rate, car payment, credit card approval, apartment rental, insurance premiums, and even some job applications. Understanding how it is calculated gives you the power to improve it. The system is transparent once you know the rules.

FICO vs VantageScore

FICO is the oldest and most widely used credit scoring model. Created by the Fair Isaac Corporation in 1989, it is used in over 90% of lending decisions. VantageScore was created in 2006 by the three major credit bureaus — Equifax, Experian, and TransUnion — as a competitor.

Both models range from 300 to 850. Both use similar factors but weight them differently. FICO requires at least six months of credit history and one account reported within the last six months. VantageScore can generate a score with as little as one month of history.

Lenders may use different versions of each model. FICO 8 is the most common for general lending. FICO 2, 4, and 5 are used for mortgages. Auto lenders use FICO Auto Score versions. The exact number matters less than the range you fall into.

The five factors of FICO

Payment history (35%). This is the most important factor. Every late payment stays on your credit report for seven years. A single 30-day late payment can drop a good score by 50 to 100 points. Pay every bill on time, every time. Set up autopay for at least the minimum amount.

Credit utilization (30%). This measures how much of your available credit you are using. If you have a $10,000 credit limit and a $3,000 balance, your utilization is 30%. Keep utilization below 30% for best results. Below 10% is ideal. Utilization has no memory — it resets each month, so you can pay down a balance and see improvement immediately.

Length of credit history (15%). Older accounts are better. Your score considers the age of your oldest account, the age of your newest account, and the average age of all accounts. Keep your oldest credit cards open even if you do not use them. Closing old accounts shortens your average history and reduces available credit.

Credit mix (10%). Having different types of credit — credit cards, installment loans, mortgages, auto loans — shows lenders you can manage various obligations. Do not take out loans solely to improve your mix, but do not avoid diversifying when you genuinely need credit.

New credit (10%). Every time you apply for credit, a hard inquiry appears on your report. Multiple inquiries in a short period suggest you are desperate for credit. Rate shopping for mortgages, auto loans, or student loans within a 14-45 day window counts as a single inquiry. Credit card applications count individually.

How to improve your credit score

Start by checking your credit report. You are entitled to one free report per week from each bureau through AnnualCreditReport.com. Look for errors — incorrect late payments, accounts that are not yours, incorrect balances — and dispute them.

Pay down credit card balances aggressively. Utilization is the easiest factor to improve quickly. Ask for credit limit increases on existing cards to lower your utilization ratio, but only if you will not be tempted to spend more.

Become an authorized user on a family member’s account with good payment history and low utilization. Their positive history appears on your credit report. Make sure the primary cardholder maintains good habits — any mistakes hurt you too.

Avoid opening unnecessary accounts. Each application triggers a hard inquiry. New accounts lower your average account age. Only apply for credit when you genuinely need it.

Using the credit score simulator

The Credit Score Simulator lets you see how different actions affect your score. What happens if you pay off a credit card? What if you miss a payment? What if you open a new account? The simulator estimates the impact based on typical scoring models.

Use it before making major credit decisions. If you are planning to apply for a mortgage, run the simulator to see whether paying off debt or opening a new card helps or hurts your score first. Knowledge is power when it comes to credit.

Your credit score is not a mystery. It is a formula. Learn the formula, optimize each factor, and watch your score rise.