Formula to Calculate Real Rate of Return
The real rate of return is the actual annual rate of return after taking into consideration the factors that affect the rate like inflation and this formula is calculated by one plus nominal rate divided by one plus inflation rate minus one and inflation rate can be taken from consumer price index or GDP deflator.
The real rate of return formula helps an investor find out what actually he gets in return for investing a specific sum of money in an investment.
For example, if Mr. Timothy invests $1000 into a bank and bank promises to offer a 5% rate of return, Mr. Timothy may think that he is getting a good return on his investment. In financial terminology, we will call this 5% as the nominal rate.
However, the question remains, is 5% the actual return on Mr. Timothy’s investment? The answer is no. We also need to consider inflation and also tax (if the return on investment is not taxdeductible).
By considering the inflation rate, we can calculate the real rate of return. Here’s the formula –
Example
Ms. Soul has kept $100,000 in a bank. The bank promises to pay a 6% rate of return at the end of the year. The inflation rate is 3% during the year. What would be the real rate of return?
By using the formula of real rate of return, we get –
 Real Rate of Return = (1 + Nominal Rate) / (1 + Inflation Rate) – 1
 Or, Real Rate of Return = (1 + 0.06) / (1 + 0.03) – 1
 Or, Real Rate of Return = 1.06 / 1.03 – 1
 Or, Real Rate of Return = 0.0291 = 2.91%.
Interpretation
In this formula, we’re first considering the nominal rate and then we will consider the inflation rate.
As you already know – the rate of return on the investment or the bank offers is the nominal rate of return. However, to find out the inflation rate, we need to use the consumer price index. Alternatively, the businesses can use a different consumer price index to calculate the inflation or they can only take the goods and services into account that are related to their business.
Here’s the formula by using which we can find out the inflation rate –
Rate of Inflation = (CPI _{x+1 }– CPI_{ x}) / CPI _{x}
Here, CPI _{x }means the initial consumer index.
If you have invested a good amount, it’s always prudent to use the real rate of return to see how much you’re actually earning on the investment.
However, if you just want to make sure how much you’re actually making in a casual sense, you can just use the following formula – (nominal rate – inflation rate).
Though this formula is not recommended, you can just check before going into detail.
Use and Relevance
As you can see already, the real rate of return is quite useful to the investors.
If the investors want to know how much they are actually making (in some cases it is actually negative), In this formula is a good one.
However, there are two things you need to consider before using this formula.
 The first thing is to deduct the inflation rate (or to divide the inflation rate); you need to make sure that you will purchase the same goods the CPI considers.
 The second thing is the rate of return is not always accurate. Yes, you can calculate the real rate of return by using the formula, but there can be more factors that you may need to consider e.g. taxes, opportunity cost, etc.
Real Rate of Return Calculator
You can use the following Real Rate of Return Calculator.
Nominal Rate  
Inflation Rate  
Real Rate of Return Formula =  
Real Rate of Return Formula = 



Real Rate of Return in Excel (with excel template)
Let us now do the same example above in Excel. This is very simple. You need to provide the two inputs of the Nominal Rate and Inflation Rate.
You can easily calculate the real rate of return in the template provided.
Recommended Articles
This has been a guide to the Real Rate of Return formula. Here we learn how to calculate the real rate of return using its formula along with examples, calculator and downloadable excel template. Here are the other suggested articles –
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 What is the Nominal Rate of Return?
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