CD Interest Calculator

Find out exactly how much interest a certificate of deposit earns. Enter your deposit, rate, and term to see projected interest in dollars and cents.

$
%

Your CD Earnings

Final Balance $10,511.62
Total Interest Earned $511.62
Initial Deposit
$10,000.00
Annual Percentage Yield (APY)
5.00%
CD Term
12 months
Compounding Frequency
Monthly

What Is a CD Interest Calculator?

A CD interest calculator is a tool that computes the dollar amount of interest a certificate of deposit (CD) produces over a fixed term. The calculator takes your initial deposit, the annual percentage yield (APY), the term length, and the compounding frequency, then returns the total interest earned separately from the final balance.

Your Deposit Details
  • Deposit Amount
  • APY Rate
  • Term Length
  • Compounding
Interest Engine A = P × (1 + r/n)n×t
Interest Breakdown
  • Interest Earned
  • Final Balance
  • Growth Chart

Key Benefits of Using a CD Calculator

  • See the exact interest earned in dollars on any deposit amount from $500 to $1,000,000 before opening a CD account
  • Compare interest earnings across 3-month, 6-month, 1-year, 2-year, and 5-year CD terms side by side
  • Determine how much additional interest daily compounding generates over monthly or quarterly compounding on the same deposit
  • Identify the minimum deposit needed to reach a specific interest income target within a given time period

CD Interest Calculation Formula

The CD interest calculator isolates the interest portion from the compound interest formula. The total interest earned equals the final balance minus the original deposit. Each variable in the formula directly affects how many dollars of interest the CD generates.

= × ( 1 + / ) ×

Click or tap any variable to see what it means

I Interest Earned
The total dollar amount of interest the certificate of deposit generates over the full term. This is the difference between the final balance and the initial deposit.
P Principal (Initial Deposit)
The starting dollar amount placed into the CD account on the opening date.
r Annual Interest Rate (APY)
The yearly rate of return expressed as a decimal. A 5.00% APY converts to 0.05 in the formula.
n Compounding Periods Per Year
How many times per year interest is added to the balance. Daily = 365, monthly = 12, quarterly = 4, semi-annually = 2, annually = 1.
t CD Term in Years
The number of years the deposit stays locked. A 6-month term equals 0.5 years; an 18-month term equals 1.5 years.

Interest earned scales with every variable. Doubling the deposit doubles the interest. Doubling the term more than doubles it because compound interest accelerates over time.

How to Use the CD Interest Calculator

Calculate the interest your certificate of deposit will produce in 3 steps. Results appear immediately after you click Calculate.

1

Enter Deposit and APY

Type the dollar amount you plan to deposit and the annual percentage yield (APY) from your bank or credit union. The APY already factors in compounding, so enter the exact rate from the offer sheet.

2

Choose Term and Compounding

Select how long the CD will run — in months or years. Pick the compounding frequency your bank uses: daily (365/yr), monthly (12/yr), quarterly (4/yr), semi-annually (2/yr), or annually (1/yr).

3

Read Your Interest Earnings

The calculator displays the total interest earned in dollars, the final balance at maturity, and a growth chart. Change any input to compare interest across different scenarios.

Factors That Affect CD Interest Earnings

Four primary factors control the dollar amount of interest a certificate of deposit earns. Changing any single factor shifts the total interest up or down.

1

Annual Percentage Yield (APY)

The APY is the single largest driver of interest earnings. A $10,000 deposit at 5.25% APY earns $52.50 more per year than the same deposit at 4.75% APY — a 10.5% increase in annual interest income.

2

Deposit Amount

Interest scales linearly with the deposit. A $50,000 CD earns 5 times the interest of a $10,000 CD at the same rate and term. Jumbo CDs ($100,000+) sometimes qualify for a higher APY.

3

CD Term Length

Longer terms produce more total interest because compounding has more time to work. A 5-year CD at 5% APY earns roughly 5.7 times the interest of a 1-year CD — not just 5 times — because of compound growth.

4

Compounding Frequency

More frequent compounding generates slightly more interest. On a $10,000 CD at 5% for 1 year, daily compounding earns $512.67 in interest while annual compounding earns $500.00 — a $12.67 difference.

Interest Earned: $10,000 at 5% APY for 3 Years by Compounding

Total interest earned after 3 years across different compounding frequencies

CD Interest Calculation Examples

These 4 worked examples show how much interest different CD deposits earn at current rates. All examples use monthly compounding (12 times per year) to reflect how most banks and credit unions structure CD accounts.

$5,000 CD — 6 Months at 4.75% APY

Initial Deposit
$5,000
APY
4.75%
Term
6 Months
Compounding
Monthly
Interest Earned $119.53
Final Balance $5,119.53

$5,000 CD — 3 Years at 4.75% APY

Initial Deposit
$5,000
APY
4.75%
Term
3 Years
Compounding
Monthly
Interest Earned $762.40
Final Balance $5,762.40

CD Interest Calculator — Frequently Asked Questions

How do you calculate interest on a CD?

Use the compound interest formula: Interest = P × (1 + r/n)^(n×t) − P, where P is deposit, r is rate, n is compounding frequency, and t is term in years.

How much interest does a $50,000 CD earn in 1 year?

A $50,000 CD at 5.00% APY compounded monthly earns about $2,558 in interest after 1 year.

Does compounding frequency change how much CD interest I earn?

Yes, more frequent compounding earns slightly more interest — daily compounding produces the highest return at the same rate.

Is CD interest taxable?

Yes, CD interest is taxable as ordinary income in the year it is credited to your account.