Difference Between Sensex and Nifty

If you are switching channels and at some point between the cricket highlights and the weather forecast, a news anchor pops up and says, “Sensex ends the day 450 points higher, Nifty settles just above 24,000″, what would have been your reaction?” Most of the time, those watching would either know the meaning and leave the subject, or just change channels.

If you have heard these words a hundred times but never understood what separates one from the other, today’s blog is for you.

Sensex and Nifty come from different exchanges, track different sets of companies, and are used differently by different kinds of market participants. They usually move together, sure. But they are not the same.

What Is an Index?

India has over 5,000+ companies listed across its stock exchanges. Nobody can track all of them at once to form a view on “how the market is doing.” So what we do instead is pick a representative group of companies, and use that as a benchmark for the market. This benchmark is known as a stock market index.

There are broadly two most used Indices in India: Sensex & Nifty 

What Are Sensex and Nifty? 

SENSEX 

It is the index of the Bombay Stock Exchange, BSE. It was launched in 1986, making it the oldest index in India. The base year was extended back to 1978-79, when the value was 100.

In the past four and a half decades, Indian markets have evolved from 100 to 75,000.

Sensex tracks 30 companies. These are large, well-established businesses from various sectors, selected by BSE based on how big they are, how frequently their shares are traded, and how well they represent the broader economy. 

Every few months, BSE reviews the composition. A company that does not fit the pre-decided criteria might get replaced by one that has grown. 

How is Sensex Calculated? 

Sensex follows the same logic of free-float market capitalisation, but with one difference in the final step. 

Instead of dividing by the base market capitalisation and multiplying by 1000, the Sensex divides the free-float market capitalisation of its 30 companies by an index divisor of 100.

Free-float Market Capitalisation = Market Capitalisation * Free-float Factor

Index Value = Free-float Market Capitalisation / Index Divisor

NIFTY 

Nifty is the benchmark index of the National Stock Exchange NSE. Its full name is Nifty 50. The word “Nifty” is actually a combination of “National” and “Fifty”, named after the 50 companies it tracks.

It was launched in 1996, about a decade after Sensex, with a base value of 1,000 (starting November 1995). NSE itself was established in 1992, despite being the exchange that was founded much later, it has grown to become the world’s largest derivatives exchange by contract volume. 

You will find everything from Asian Paints and Bajaj Finance to Maruti, Wipro, and Nestle India. 

How is Nifty Calculated? 

Since June, 2009, the NIFTY 50 has been calculated using the Free-Float Market Capitalisation Weighted Method. 

Before you calculate the index, you need to understand the free-float.

Market Cap = Total Shares Outstanding * Current Market Price

This excludes shares held by promoters, government holdings, etc. It only counts the shares that are actively available for trading by the general public.

Free-float Factor (IWF): percentage of shares available to the public

Free-float market Cap = Total Market Cap * Free Float Factor

Example: 

A company has a total market cap of ₹10,000 crores, but promoters hold 60% of the shares and only 40% is for the public. 

Free-float Factor = 40% or 0.40 

Free-float Market Cap = ₹10,000 * 0.40 = ₹4,000 Crore

Now, calculate the index value.

Index Value = (Current Market Value / Base Market Capital) * 1000

Table of Differences: Nifty vs. Sensex

S. No	Parameter	Nifty	Sensex
1	Full Form	National + Fifty	Sensitive + Index
2	Also Known As	Nifty 50, S&P CNX Fifty	S&P BSE Sensex
3	Owned & Managed By	IISL (NSE subsidiary)	Bombay Stock Exchange
4	Base Value	1,000	100
5	Base Period	3rd November,  1995	1978 – 79
6	Number of Stocks	50	30
7	Sectors Covered	24	13

Where They Actually Different in Practice

• The exchange they belong to: Sensex belongs to BSE, founded in 1875, Asia’s oldest stock exchange. Nifty belongs to NSE, established in 1992, but built on a stronger technology infrastructure from day one. Both are regulated by SEBI.
• The base values: A lot of people get confused seeing Sensex at 75,000 and Nifty at 22,700 and wondering why one looks so much higher. It is simply because they started from different points. Sensex started at 100. Nifty started at 1,000.
• F&O trading: NSE absolutely dominates India’s derivatives market. Nifty options, weekly and monthly, are among the most traded financial contracts anywhere in the world. 

The liquidity, the strike prices available, the ease of execution, everything about Nifty F&O is built for scale.

BSE has its own derivatives segment, but it does not come close to NSE in terms of volume or participation.

Read Also: Difference Between Trading and Investing

Conclusion 

Sensex and Nifty are not competing with each other, they are just two different lenses on the same market. For everyday investors and traders in India, both matter. The more you interact with the markets through mutual funds, through direct equity or through F&O, the more naturally you will develop a sense of when to look at one instead of the other.

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