What Is APY? A Beginner's Guide To Annual Percentage Yield

APY or Annual Percentage Yield is the amount of interest you earn in a year, including compound interest. Compound interest sets APY apart from your average interest rate. APY is a true reflection of how your money grows in a savings account, certificate of deposit (CD) or other interest-bearing account.

Key Takeaways

• APY shows your true earnings because it factors in compound interest, giving you a clearer picture of growth than a basic interest rate. The formula is APY = (1 + r/n)ⁿ – 1, where r is your rate and n is the number of compounding periods per year.

• APY differs from APR in one important way — APY is what you earn on savings, CDs and money market accounts, while APR is what you pay on loans and credit cards. Higher APY wins, lower APR wins.

• Compare rates before parking your cash. Aim for 4.00% or higher on a high-yield savings account or 12-month CD, check whether the APY is fixed or variable and look at online banks, fintechs and credit unions for the best yields.

Summary generated by AI, verified by MoneyLion editors

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APY is the percentage that tells you the total amount of interest you'll earn over a year, factoring in how often the bank adds interest to your account, which is called compounding.

APY Calculator: See How Much Your Savings Can Grow

MoneyLion's APY calculator helps you visualize how your savings will grow over time based on different annual percentage yields, allowing you to make smarter decisions about where to keep your money.

How Is APY Calculated?

Here's a breakdown with a formula and an easy APY example:

APY = (1 + r/n)ⁿ – 1

Where:

• r = the annual interest rate (in decimal form)

• n = number of compounding periods per year

Example:

Say you deposit $1,000 in a savings account with a 5% annual interest rate, compounded monthly. That means r equals 0.05 and n equals 12.

Plug in your numbers:

APY = (1 + 0.05/12)¹² – 1

APY = (1.004167)¹² – 1

APY ≈ 0.0512, or 5.12%

1. Convert your 5% interest rate into a decimal. In this case, it's 0.05.

2. Divide that by the number of compounding periods. 0.05 / 12 = 0.004167

3. Add 1. 1 + 0.004167 = 1.004167

4. Raise that result by the power of 12, which is the number of compounding periods. (1.004167)¹² ≈ 1.0512

5. Subtract 1 to get your APY. 1.0512 − 1 = 0.0512

6. Convert that result into a percentage. APY ≈ 5.12%

In effect, your return is 5.12%, not just 5%. That's the magic of compounding.

That's how to find APY — but want a shortcut? Just use an APY calculator like MoneyLion's to gain an understanding of how much you could save over time.

APR vs APY: What's the Difference?

APR is what you pay. APY is the interest that you earn.

Here are some main ways of distinguishing the two. 

👉 Learn More: What is APR?

How Does Compound Interest Work?

Compound interest is where things get juicy. Instead of earning interest on just your initial deposit, you earn interest on your interest. It’s what makes how APY works so important.

The more frequently interest compounds — daily, monthly, etc — the faster your money grows. That's why how to calculate APY matters — because a 5% rate compounded daily will earn you more than the same rate compounded yearly.

In short, compounding is free money. So don’t sleep on it.

Variable APY vs. Fixed APY

Let’s talk about commitment issues.

• Fixed APY: Stays the same. Think CDs or promo-rate accounts. Great for planners who hate surprises.

  • Example: You open a 12-month CD at 4.50% fixed APY. It stays 4.50% the whole time, no matter what the market does.

• Variable APY: Changes with the market. You'll see this with high-yield savings accounts. Can go up or down.

  • Example: Your online savings account starts at 4.75% APY but drops to 4.30% next quarter.

How To Choose Between Variable Apy and Fixed Apy

• Fixed: Go with this if you're risk-averse.

• Variable: Go with this if you like the thrill of chasing tap rates. Just be sure to check regularly — you can always switch banks. 

What Is a Good APY?

A “good” APY depends on a lot of factors, like the Fed Funds rate, overall market conditions and type of bank you're using. Here’s a quick cheat sheet:

• High-yield savings account: 4.00% APY is solid in today's market. The average rate on savings accounts according to the FDIC is 0.38%, as of May 2026.

• Traditional savings account: Low, under 0.5% at the time of writing

• CDs: Longer terms means better rates. Look for 4.50% or higher on 12-month CDs

• Money market accounts: Often similar to savings, but with more flexibility

Tip: To find APY that works for you, skip the brick-and-mortar banks and check online options. Fintechs and credit unions tend to serve up better yields.

Keep Your Money Growing the Smart Way

Here’s the deal: once you understand how to calculate APY, you’ll never fall for meh interest again. It's not just about the number — it's about what's behind the number. The APY formula gives you a real view of what you’re earning, while understanding compound interest and variable vs. fixed APY helps you pick the right account for your goals.

So next time you're choosing where to park your cash, remember: don't just ask about the rate. Ask how it’s compounding, whether it’s fixed or variable, and whether your money is doing more than just sitting pretty.

You earned that money. Time for it to return the favor.

FAQs

How does APY work on a savings account?

You earn interest — usually calculated daily and paid monthly — based on your account balance and APY.

What is APY on a CD?

APY is the amount of interest you’ll earn on your CD over a year, including compounding. Fixed term, fixed rate.

What is the difference between APY and interest rate?

The interest rate is the base number. APY includes compounding, giving you the true return.

What is 5% APY on $1000?

5.00% APY is about $51.16 over one year if compounded monthly.

What is dividend rate vs APY?

Credit unions often list a dividend rate of simple interest and an APY that includes compounding. APY shows your real return.

Key Terms

• Annual percentage yield (APY): The total interest you can earn on a deposit account in one year, including compound interest.

• Compound interest: Interest earned on your original deposit and on the interest already added to your account.

• Interest rate: The base rate a bank pays on your balance before factoring in compounding.

• Annual percentage rate (APR): The yearly cost of borrowing money, including interest and some fees.

• Certificate of deposit (CD): A savings account that usually pays a fixed rate when you leave your money untouched for a set term.

Sources:

• Consumer Financial Protection Bureau: § 1030.2 Definitions

• Investor.gov: Compound Interest

• Consumer Financial Protection Bureau: What is a certificate of deposit (CD)?

• Consumer Financial Protection Bureau: § 1026.14 Determination of annual percentage rate

Summary generated by AI, verified by MoneyLion editors