July 20, 2024

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How Is Ftse 100 Calculated?

3 min read

A Comprehensive Guide to Understanding the Calculation Process

When it comes to investing in the stock market, the FTSE 100 is one of the most widely recognized indexes. But have you ever wondered how it is calculated? In this article, we will delve into the intricate process behind the FTSE 100 calculation, providing you with a detailed understanding of how this influential index is derived.

The Basics of the FTSE 100

The FTSE 100, also known as the Financial Times Stock Exchange 100 Index, is an index composed of the 100 largest companies listed on the London Stock Exchange. It serves as a benchmark for the performance of the UK stock market, providing investors with insights into the overall health and direction of the economy.

Now, let’s dive into the calculation process of the FTSE 100.

Market Capitalization and Weighting

The FTSE 100 calculation is based on market capitalization. Market capitalization is determined by multiplying the total number of shares of a company by its current market price per share. The larger the market capitalization of a company, the higher its weight in the index.

The FTSE 100 is a free-float market capitalization-weighted index. This means that the index only considers the shares that are available for public trading, excluding any shares held by governments, strategic investors, or company insiders. This approach ensures that the index accurately reflects the market value of the companies included.

Regular Reviews and Rebalancing

The composition of the FTSE 100 index is reviewed on a quarterly basis. Companies that no longer meet the eligibility criteria may be removed, while new companies fulfilling the requirements may be added. These reviews ensure that the index remains representative of the current market conditions and includes the most relevant companies.

Moreover, the FTSE 100 is rebalanced on a daily basis to account for any changes in the market capitalization of its constituent companies. This ensures that the index accurately reflects the performance of its components.

Impact of Stock Splits and Dividends

Stock splits and dividends can have an impact on the calculation of the FTSE 100. In the case of a stock split, where a company increases the number of its outstanding shares, the market capitalization is adjusted accordingly to maintain the index’s accuracy. Dividends, on the other hand, do not affect the market capitalization and are not factored into the index calculation.

Importance of Sector Representation

The FTSE 100 aims to provide a diversified representation of various sectors within the UK economy. This means that the index is designed to include companies from different industries such as finance, energy, healthcare, and technology. The weight of each sector within the index is determined by the market capitalization of its constituent companies.

FTSE 100 and Global Markets

The FTSE 100 is closely watched by investors around the world as it serves as an indicator of the health of the UK economy. Additionally, the index is often used as a benchmark for international fund managers who invest in UK equities. The performance of the FTSE 100 can also be influenced by global market trends and events.


Understanding how the FTSE 100 is calculated is essential for any investor looking to navigate the world of stock market investing. By knowing the principles behind the index calculation, investors can make more informed decisions and gain a deeper understanding of the UK market. The FTSE 100 plays a vital role in tracking the performance of the largest companies on the London Stock Exchange and offers valuable insights into the overall state of the economy.

So, the next time you come across the FTSE 100 in financial news, remember the intricate process behind its calculation and the wealth of information it provides to investors worldwide.

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