CD Calculator

Estimate the interest earned and final balance on a certificate of deposit. Enter your deposit amount, APY, term length, and compounding frequency to see projected earnings.

$
%

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 Calculator?

A CD calculator is a financial tool that computes the total interest earned and final balance on a certificate of deposit (CD). The calculator uses compound interest math to show how an initial deposit grows over a fixed time period at a given annual percentage yield (APY).

Your Inputs
  • Deposit Amount
  • APY Rate
  • Term Length
  • Compounding
CD Calculator A = P × (1 + r/n)n×t
Your Results
  • Interest Earned
  • Final Balance
  • Growth Chart

Key Benefits of Using a CD Calculator

  • Compare interest earned across different APY rates and term lengths before opening a certificate of deposit
  • See the exact dollar amount of compound interest your deposit generates at daily, monthly, quarterly, or annual compounding
  • Plan your savings by projecting the final balance at maturity for deposits ranging from $1,000 to $500,000
  • Evaluate whether a short-term CD or a long-term CD better fits your financial goals and liquidity needs

CD Calculator Formula

The CD calculator uses the standard compound interest formula to compute the final balance. Each variable in the formula controls a specific part of how interest accumulates over the term of the certificate of deposit.

= × ( 1 + / ) ×

Click or tap any variable to see what it means

A Final Balance
The total amount you receive at maturity, including the initial deposit plus all compound interest earned.
P Principal (Initial Deposit)
The dollar amount you deposit into the certificate of deposit when the account opens.
r Annual Interest Rate
The yearly interest rate expressed as a decimal. A 5% APY becomes 0.05 in the formula for rate conversion.
n Compounding Frequency
The number of compounding periods per year. Daily compounding uses 365, monthly compounding uses 12, quarterly compounding uses 4, and annual compounding uses 1.
t Term Length (Years)
The duration of the certificate of deposit measured in years. A 6-month CD equals 0.5 years in the formula.

The effective annual yield (EAY) increases with more frequent compounding. A $10,000 CD at 5% APY compounded daily earns $2.09 more per year than the same CD compounded annually.

How to Use the CD Calculator

Calculate your certificate of deposit earnings in 3 steps. The calculator instantly shows your projected interest earned, final balance, and a growth chart the moment you click Calculate.

1

Enter Your Deposit Details

Type your initial deposit amount in dollars and the annual percentage yield (APY) offered by your bank or credit union. The APY already accounts for compounding, so enter the exact rate from your CD offer.

2

Set Term and Compounding

Choose the CD term length in months or years. Then select the compounding frequency — daily (365 times per year), monthly (12 times per year), quarterly (4 times per year), or annually (1 time per year).

3

View Your Projected Returns

Click Calculate to see the total interest earned in dollars, the final balance at maturity, and a visual growth chart. Adjust any input to compare different CD scenarios side by side.

Factors That Affect CD Returns

Five main factors determine how much interest a certificate of deposit earns. Understanding each factor helps you pick the CD that produces the highest return for your situation.

1

APY (Annual Percentage Yield)

A higher APY means more interest earned on the same deposit. Even a 0.25% difference on a $10,000 deposit adds $25 per year in additional interest.

2

Compounding Frequency

Daily compounding earns more than monthly compounding, which earns more than quarterly or annual compounding. The difference grows larger on bigger deposits and longer terms.

3

Term Length

Longer CD terms of 3 to 5 years typically offer higher APY rates than shorter 6-month or 1-year terms. The trade-off is reduced access to your funds until the maturity date.

4

Initial Deposit Size

Larger deposits generate more total interest in dollar terms. A jumbo CD (typically $100,000 or more) may qualify for a higher APY at some banks and credit unions.

5

Early Withdrawal Penalties

Withdrawing funds before the maturity date triggers a penalty, usually equal to 3 to 12 months of interest. No-penalty CDs exist but typically offer a lower APY.

Compounding Frequency Impact on $10,000 at 5% APY (5 Years)

Interest earned after 5 years by compounding frequency

CD Calculation Examples

See exactly how much interest a certificate of deposit earns at current rates. These 4 examples use real compound interest math at monthly compounding to show projected returns on common deposit amounts.

$10,000 CD — 1 Year

Initial Deposit
$10,000
APY
5.00%
Term
1 Year
Compounding
Monthly
Interest Earned $511.62
Final Balance $10,511.62

$10,000 CD — 5 Years

Initial Deposit
$10,000
APY
5.00%
Term
5 Years
Compounding
Monthly
Interest Earned $2,833.59
Final Balance $12,833.59

Free CD Calculator Tools

10 specialized certificate of deposit calculators designed for precision yield forecasting, compounding comparisons, and custom investment terms.

Interest

Compute the exact dollar amount of interest a CD earns at any rate, term, and compounding frequency.

Maturity

Project the total value of your CD on its maturity date and plan renewals or withdrawals.

APY

Convert a stated APR into the effective APY based on compounding frequency to compare CD offers.

Compound Interest

See how compound interest accelerates CD growth and compare daily, monthly, and quarterly schedules.

Simple Interest

Calculate returns using the simple interest formula I = P × r × t and compare to compound alternatives.

Compounded Daily

Calculate CD returns with 365 compounding events per year — the highest-yield standard schedule.

Compounded Monthly

Estimate CD earnings with monthly compounding — the industry-standard schedule at most banks.

Compounded Quarterly

Calculate CD interest with quarterly compounding — 4 interest calculations per year.

By Days

Enter an exact day count — 30, 90, 180, or any custom number — to get penny-precise CD returns.

By Month

Break down CD earnings into monthly intervals to track interest growth month by month.

Frequently Asked Questions

How is CD interest calculated?

CD interest is calculated using the compound interest formula A = P × (1 + r/n)^(n×t), where P is your deposit, r is the annual rate, n is compounding frequency, and t is the term in years.

How much does a $10,000 CD earn?

A $10,000 CD at 5.00% APY compounded monthly earns about $512 in one year and roughly $2,834 over five years.

How much does a $100,000 CD earn?

A $100,000 CD at 5.00% APY compounded monthly earns about $5,116 in one year and roughly $28,336 over five years.

Are CDs compounded monthly?

Most CDs are compounded either daily or monthly — daily compounding earns slightly more since interest begins generating its own interest sooner.

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