Market Cap Calculator
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Market Cap Calculator is an investment calculator to calculate the market capitalization of a public company. Traders and investors can use the marke capitalization calculator to calculate the size of a company by the current stock price and outstanding shares.
| Market Capitalization: |
$1,500,000,000.00 |
How to calculate market cap?
The market cap formula below shows you how to calculate market cap of a stock.
M = P x O, where
M = Market cap of a public traded company
P = Current stock price
O = Outstanding shares
What is market cap?
Market capitalization or market cap is the total value of a company based on total shares and the current stock price.
How is the market cap calculated?
The market cap of a company is calculated by multiplying the total number of outstanding shares and the price of its stock.
Market Cap = Outstanding Share X Stock Price
Market cap example
For example, if a stock has $5 million outstanding shares, and its stock price is $20, the market cap for the company would be $100 million.
Market Cap = $5 million X $20 = $100 million
Types of market cap
The market cap of any public company falls into 5 categories, mega cap, large cap, mid cap, small cap, and micro-cap.
1. Mega-cap companies
These are publicly traded companies with a market cap of $200 billion or more. Mega-cap companies are market leaders in their industry and have been in business for decades. Their stocks are often referred to as blue-chip stocks.
Mega-cap companies are included in major indexes such as the Dow 30, S&P 500, and the majority of their shares are held by institutional investors.
You won't see crazy moves in their stock price on a day-to-day basis unless they announce really bad earnings news.
2. Large-cap companies
Public companies with a market cap of 10 billion to 200 billion are considered large-cap companies. These are solid companies with a good reputation and have been in business for a long time. Large-cap companies are known to produce quality products and services.
The only exception to this rule is technology stocks. Some technology stocks become large caps even when they are still losing money or with little revenue, that's because many are betting on the future of the companies which drives their stock price higher.
Large-cap companies are not waterproof to risk, especially tech stocks. For example, when Robinhood went public, the IPO price was $38 with a market cap over $32 billion. In its first year of trading, the stock dropped over 75%.
3. Mid-cap companies
These companies have a market cap of anywhere between $2 billion to $10 billion. Mid-cap companies usually have more upside potential than large-caps or mega-caps but are also riskier.
Some of the mid-cap companies are growing rapidly and this is where many investors look for growth stocks before they make major moves and become large caps. Of course, the majority of them stay as mid-caps or even lose value.
4. Small-cap companies
These are companies that have a market cap from $300 million to $2 billion. These are usually younger companies that are still trying to break through in their industries.
Small-caps are much riskier than mid-cap and large-cap because their stock prices are usually volatile with big swings and fluctuations during earnings seasons.
5. Micro-cap companies
Companies with a market cap under $300 million are known as micro-cap. Their stock prices are highly volatile and not recommended for beginners to trade or invest.
Profits can be made fairly quickly with micro-caps stocks but can be lost just as easily. Some of these stocks have low liquidity meaning you may have trouble finding a buyer when you are ready to sell your shares.
Whenever earnings news is released, a stock can easily go up or down 20% or more. Conservative investors should stay away from micro-cap stocks.
What is market cap important?
Market cap gives insights into what type of companies you are buying.
If you are buying a mega-cap, you know you are buying a pretty solid company where the stock price doesn't move much in the short term, but they could be long-term picks.
If you are buying a micro-cap stock, it's usually for short-term trading. You might be doing day trading or swing trading where you buy and sell micro-cap stock in a short period of time and make profits on the stock price movement.
Micro-cap stocks may be good targets for short-term traders, but they are rarely good investments for long-term investors.
Top 20 Public Traded Companies by Market Cap
Last Update: Jan 22, 2026
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