How Is the Fixed Deposit Interest Rate Calculated?

Personal Finance

Have you ever wanted to learn more about fixed deposit interest rates? This article breaks down the process of calculating the fixed deposit interest rate. It highlights the various factors that affect the interest you can earn on your fixed deposit and provides tips on maximising your returns. With this guide, you can make informed decisions and get the most out of your fixed deposits. 

What is a fixed deposit?

A fixed deposit is a type of investment that provides a regular income and is a great way to save money for short-term and long-term financial goals. A fixed deposit typically has a higher interest rate than a savings account and is less risky as the money is insured. 

When you invest in a fixed deposit, the bank or financial institution will hold the money for a specified period. The institution will provide you with a pre-determined interest rate. The interest you earn is determined at the start of the investment term and will not change throughout the investment.

How are fixed deposit interest rates estimated?

Fixed deposit interest rates are calculated based on a few different factors. These factors include the cost of funds, the expected rate of inflation, and the risk associated with the investment.

  • The cost of funds refers to the expenses the bank or financial institution incurs to borrow money.
  • The expected inflation rate refers to the anticipated increase in prices over time. 
  • The risk associated with the investment refers to the chance that the institution will not be able to earn enough money on the investment to make a profit.

You may have noticed that these factors are similar to the factors that affect savings account interest rates. The main difference between the two is that the interest rate for a fixed deposit is set in advance, while the interest rate for a savings account is unknown until maturity.

How is the interest rate decided?

There are a handful of factors that affect fixed deposit interest rates. These include the account type, the bank or financial institution, and the interest rate. Let’s take a closer look at each of these factors.

  • Account type: The account you open will affect the interest rate you earn. Different types of accounts have different interest rates.
  • The type of bank or financial institution: The bank or financial institution will also affect the interest rate. Different lenders provide different interest rates based on internal factors.
  • Overall interest rate: The interest rate environment refers to the general level of interest rates in the economy. Fixed deposit interest rates may be higher if interest rates on savings accounts are higher. However, this is not a rule.

For better understanding, you may use the fixed deposit interest rate calculator. 

How do you maximise fixed deposit interest rates?

There are a few tips that can help you to maximise your fixed deposit interest rates. These tips include selecting the proper maturity, picking the right bank, and timing your investments. 

1. Select the proper maturity.

When deciding on the maturity of your FD, consider your financial goals and how quickly you need the money. The shorter the fixed deposit term, the higher the interest rate. However, you will need to be prepared to invest a significant amount because fixed deposits with shorter tenures have a higher minimum deposit amount. 

2. Pick the right lender.

When picking the lender, you will want to consider the risk associated with the lender and the cost of funds. Borrowers in good financial condition can provide money at a lower rate. They will be able to offer you a higher interest rate. Check the credibility of the lender before you make an offer.

3. Time your investments.

You will also want to consider the current interest rate environment when investing. For example, if the interest rates for all financial products are decreasing, you may not want to invest in a fixed deposit. The reason is simple: you will get a lower interest rate. Therefore, consider the current economy before you invest.

What is the formula for calculating FD interest rates?

To calculate the interest rate for a fixed deposit, you will first have to determine the deposit tenure. The interest rate is calculated based on the following formula:

Interest rate = (Simple interest × 100) / (Principal × Time).

The calculation using the formula is simple. For example, if you have earned Rs. 1,200 in interest on an initial principal amount of Rs. 12,000 over 3 years. You can apply the formula as follows:

Interest rate = (1,200 × 100) / (12,000 x 3) = 3.33%

Therefore, the interest rate of your fixed deposit is 3.33%.

How do fixed deposit interest rates compare with those of other products?

Now that you know more about fixed deposit interest rates, you may wonder how they compare to other investments. For example, are fixed deposits a better investment than shares and bonds?

Compared to both stocks and bonds, fixed deposits are less risky. However, the only drawback is that you will get a lower return. It is advisable to understand the risks involved when you are investing in any particular type of product. If you understand the risk, you can invest in any FD of your choice.


A fixed deposit is a great way to earn a safe and steady return on your savings. However, you should research and select the highest interest-rate accounts to get the most out of your fixed deposits. A fixed deposit interest rate is generally set in advance. The best way to find the highest interest rate on a fixed deposit is to shop around and compare rates from different banks.

For more information on fixed deposits and articles related to finance, visit Piramal Finance.