You know credit scores exist. You might even know what yours is. But do you know how it’s calculated and why it’s important?

Your credit score affects whether you can get a credit card, rent an apartment, buy a house, start a business, or even get a cell phone contract.

A low credit score can limit your choice of loans or determine if you can get one at all — and if you can, it might have a high interest rate.

“There’s a huge cost to having a low credit score that happens to people, an actual true financial cost to them, and it’s a shame that people don’t learn about this or know about it or pay attention to it until usually it’s too late,” said Colleen McCreary, consumer financial advocate at Credit Karma.

Here’s a look at how you can create healthy habits to avoid having a low credit score:

What is a credit score?

A credit score is a mathematical formula that helps lenders determine how likely you are to pay back a loan. Credit scores are based on your credit history and range from 300 to 850.

“It’s a score that is going to determine how comfortable people are to lend you money,” McCreary said.

If your credit score is high, you can borrow more money. But if it’s low, you can borrow less or no money, or borrow money with a high interest rate, which can then create more debt.

Banks, landlords and insurance companies look at your credit score to determine the type of credit card that you can get approved for, whether you are the right fit for an apartment, and your insurance rate, among other things.

“Essentially, the bank will say ‘Hey, you don’t have a great credit score. Instead of a 2% interest rate, we’re going to give you a 3% interest rate,’” said Kristin Myers, editor in chief of The Balance, a personal finance website. “It might mean that you’re paying out more money over the lifetime of a loan every single month.”

How is my credit score calculated?

While the idea of credit scores is simple, the way they’re determined is more complicated.

Credit scores can come from several credit reporting agencies. The three most used are Experian, Equifax and TransUnion. Each has its own model to calculate credit scores.

While we know generally what factors into the credit scores, the agencies don’t share their specific formulas with the public. But each produces a slightly different score.

“One is scoring like a basketball game, one is like a football game and one is scoring like a hockey game,” said McCreary, who added that you shouldn’t worry if one agency gives you a few points less than others.

Since you don’t know which agency your lender is going to use to check your credit score, McCreary also recommends that you check all three of them before requesting a large amount of credit.

Here are the factors that are frequently used to calculate your credit score:

• Bill payment history
• Length of credit history
• Current unpaid debt
• How much of your available credit you’re using
• New credit requests
• If you have had debt sent to collection, foreclosure, or a bankruptcy

One thing that doesn’t affect your credit score is how much money you make, said McCreary. But you still need to take care to only borrow the amount you can afford to pay back.

Other aspects that don’t affect your credit score include your age, where you live and your demographic information such as race, ethnicity, and gender, according to Experian.

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How do I find out my credit score for free?

There are several ways that you can check your credit score for free. A great place to start is to check if your bank offers this service for its customers. Additionally, each of the three credit reporting agencies allows you to check your credit score for free.

Everyone is entitled to one free credit report a year from the three agencies at annualcreditreport.com, according to the federal government.

Other companies such as NerdWallet, Credit Karma and WalletHub also offer this service for free.

What is a good credit score?

You are considered to have a good credit score if it’s 670 or higher. If your credit score is over 750, you’re considered to have a great credit score, said McCreary.

“There is this sort of dream scenario of having an over 800 credit score, that is a very high credit score and very few people get there,” said McCreary.

“Fair” credit scores are considered to be in the 580-669 range, a credit score below 580 is considered a poor credit score.

How can I improve my credit score?

The journey to improve your credit score is different for everyone. But some steps that can help you tackle credit card debt include paying at least the minimum monthly payment and, if you can, paying just a bit more over the minimum so you pay less interest over time.

Additionally, McCreary recommends that you try to keep a balance between your credit or loans and the amount you can afford to pay back.

Does checking my credit score lower it?

Checking your credit score does not lower it unless you are making a “hard inquiry,” which is only done when requesting a line of credit.

Soft inquiries, where you want to know your credit score, do not affect your score and it’s a good habit to check your credit often to make sure it’s accurate.

On the other hand, lenders make hard inquiries when you apply for credit like a mortgage or a car loan, and those do show up on your credit report.

McCreary recommends not making several requests for credit at the same time since this could hurt your credit score. It’s best to know beforehand what your credit score is and then apply when you are confident that your loan will get approved.

How can I create healthy habits with my credit score?

The first step is to check at least once a year to make sure you are comfortable with your current credit score.

If you are planning to request a large credit line, you want to check your score a few months prior and see how you can start improving it. If you are currently trying to increase your credit score, it’s recommended that you check it often to see if your actions are making a difference.

If you feel you need help from a professional to improve your credit score, a good place to start is the National Association of Personal Financial Advisors ′ search engine for registered advisors. If you notice a mistake in your credit report, you can dispute it by contacting the respective credit reporting agencies.

Being aware of your credit score and maintaining healthy habits around it is crucial to having a good credit history. However, it is important for people to know that their financial worth shouldn’t be attached to their credit score, Myers said.