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CD Interest Calculator

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Updated Mar 23, 2026
Read Time 5 min

Using CD Interest Calculator

A CD interest calculator will help you calculate the total amount to be received along with interest, which will be earned when you invest the amount in the certificate of deposit.

About CD Interest Calculator

The formula for calculating CD interest is as below:

M = I * ( 1 + i/N )n * N

Wherein,

  • M is the total maturity amount
  • I is the initial amount that is invested
  • i is the fixed rate of interest
  • N is the frequency of interest is paid
  • n is the number of periods for which investment shall be made.

The CD is a type of investment product that stands for a certificate of deposit. This is an investment where the investor locks in his funds to earn a little higher interest rate than other products. If an investor invests for a longer period, he will earn more interest as the rate would be higher.

The interest payout could be annually, semi-annually, or quarterly, depending upon financial institution terms. The interest is compound interest, and this calculator will calculate interest accordingly and provide the result as the total amount at maturity, including interest.

The Hargreaves Lansdown provides access to a range of investment products and services for UK investors.

Download FREE CD Interest Calculator Excel Template and Follow Along!
Download Excel Template

How To Calculate CD Interest?

One needs to follow the below steps to calculate the CD interest along with the total amount at maturity.

Step #1: Determine the initial amount which is to be invested. That would be the initial investment.

Step #2: Figure out the rate of interest that is being provided on the certificate of deposit and the frequency of the same being paid. That is how much it will be paid in a year, denoted by N.

Step #3: Now, determine the period or number of years for which it shall be invested.

Step #4: Divide the interest rate by the times the interest would be paid in a year. For example, if the rate of interest is 5% and it pays semi-annually, it means the interest would be paid out twice, and therefore the rate of interest would be 5%/2, which is 2.5%.

Step #5: Now multiply the investment amount by the applicable interest rate using the above-mentioned formula.

Step #6: The resultant figure will be the maturity amount of the certificate of deposit, including the interest.

CD Interest Examples

Example #1

JP Morgan and Chase is one of the leading investment banks in the United States. It has initiated a new product in a bucket of the certificate of deposit. The scheme states that the minimum amount which is required to be deposited is $25,000, and the minimum duration is 6 months. The APY for this scheme is 2.25% if invested for more than one year else, 1.98% for all deposits for less than a year. The interest will be compounded semi-annually.

Suppose one invests in this scheme for two years; then what will be the amount received at maturity?

Solution:

We are given the below details:

Sr NoParticularsAmount
1Investment Amount$25,000.00
2Rate of Interest2.25%
3Frequency in MonthsSemi-annually
4Frequency in Number2
5n – number of period to be invested2
  • I = $25,000
  • i = Rate of interest, which is 2.25% that is applicable for a period of 2 years
  • N = Frequency which is semi-annually and interest will be paid twice a year
  • n = number of years the investment proposed to be made, which is 2 years here.

Now, we can use the below formula to calculate the maturity amount.

M = I * ( 1 + i/N )n * N
CD Interest Calculator
  • = 25,000 * ( 1 + 2.25%/2 )2 x 2
  • =$26,144.13

Compounded interest amount

Example 1.2 - Compound Interest
  • = $26,144.13 – $25,000
  • = $1,144.13

Example #2

Three banks are offering limited period CDs, and Mr. X wants to invest $89,000 in the one that pays the highest maturity amount.

Bank IBank IIBank III
Period Allowed2 years2 years1 year & 6 months
Rate of Interest4.50%5.00%6.00%
Interest PayoutQuarterlyAnnuallySemi-annually

Based on the above information, you must advise Mr. X on where to invest to earn the maximum amount at maturity.

Solution:

BANK I
CD Interest Calculator - Example 2.1
  • I = $89,000
  • i = Rate of interest, which is 4.50% that is applicable for a period of 2 years
  • N = Frequency which is Quarterly here; hence interest payout will be 4
  • n = number of years the investment to be made, which is 2 years here.

Now, we can use the below formula to calculate the maturity amount.

M = I * ( 1 + i/N )n * N
CD Interest Calculator - Example 2.2
  • = 89,000 x ( 1 + 4.50 / (4 x 100 ) )4 x 2
  • = 97,332.59

Compounded interest amount

Example 2.3 - Bank I (Compound Interest)
  • = 97,332.59 – 89,000
  • = 8,332.59
BANK II
CD Interest Calculator - Example 2.4
  • I = $89,000
  • i = Rate of interest, which is 5.00% that is applicable for a period of 2 years
  • N = Frequency which is Annually here; hence it will be 1
  • n = number of years the investment to be made, which is 2 years here.

Now, we can use the below formula to calculate the maturity amount.

M = I * ( 1 + i/N )n * N
CD Interest Calculator - Example 2.5
  • = 89,000 x ( 1 + 5.00 / (1 x 100 ) )1 x 2
  • = 98,122.50

Compounded interest amount

Example 2.6 -Bank II (Compound Interest)
  • = 98,122.50 – 89,000
  • = 9,122.50
BANK III
CD Interest Calculator - Example 2.7
  • I = $89,000
  • i = Rate of interest, which is 6.00% that is applicable for a period of 1 year and 6 months
  • N = Frequency which is Semi-annually here, hence it will be 6
  • n = number of years the investment to be made, which is 1 year and 6 months here.

Now, we can use the below formula to calculate the maturity amount.

M = I * ( 1 + i/N )n * N
CD Interest Calculator - Example 2.8
  • = 89,000 x ( 1 + 6.00 / (2 x 100 ) )1.5 x 2
  • = 97,252.70

Compounded interest amount

Example 2.9 - Bank III (Compound Interest)
  • = 97,252.70 – 89,000
  • = 8,252.70

Hence, Mr. X should invest in a CD of Bank II as that is the maximum amount provided to him at maturity.

Conclusion

This calculator can calculate the maturity amount when one invests in a certificate of deposit, which offers a safer and more conservative investment than stocks and banks. There is no growth, but it offers guaranteed returns. Once you know what returns to expect, comparing rates across institutions is the next step. A CD marketplace like CD Valet (www.cdvalet.com) lists over 40,000 verified rates from federally-insured banks and credit unions across the U.S., so you can find the best rate to plug into your calculations.

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Recommended Articles

This has been a guide to CD Interest Calculator. Here we provide you with the calculator used to calculate the maturity amount when one invests in a certificate of deposit, along with some examples. You may also take a look at the following useful articles –