Market Capitalization Calculator
Instantly calculate a company's total market capitalization from its share price and shares outstanding. Use it when comparing company sizes or evaluating investment opportunities.
About this calculator
Market capitalization measures the total market value of a company's outstanding equity. The formula is straightforward: Market Cap = share_price × outstanding_shares. For example, if a stock trades at $50 and there are 10 million shares outstanding, the market cap is $500 million. Companies are typically classified as small-cap (under $2B), mid-cap ($2B–$10B), or large-cap (over $10B). Market cap is widely used to compare companies across industries, weight indices like the S&P 500, and assess a firm's relative size. Unlike enterprise value, it excludes debt and cash, so it reflects only the equity portion of the business.
How to use
Suppose Apple trades at $185 per share and has 15.6 billion shares outstanding. Enter $185 in the Share Price field and 15,600,000,000 in the Outstanding Shares field. The calculator computes: Market Cap = $185 × 15,600,000,000 = $2,886,000,000,000, or roughly $2.89 trillion. This instantly tells you Apple is a mega-cap stock and one of the largest companies in the world by market value.
Frequently asked questions
What is market capitalization and why does it matter for investors?
Market capitalization is the total dollar value of all a company's outstanding shares of stock. It gives investors a quick snapshot of a company's size without needing to dig into financial statements. Large-cap stocks are generally considered more stable, while small-cap stocks may offer higher growth potential with greater risk. Fund managers and index providers use market cap to weight holdings and classify securities.
How is market cap different from a company's total value or enterprise value?
Market cap measures only the equity value of a company — what shareholders collectively own. Enterprise value (EV) goes further by adding total debt and subtracting cash and equivalents: EV = Market Cap + Debt − Cash. Enterprise value is considered a more complete picture of what it would cost to acquire a business outright. For debt-heavy companies, enterprise value can be significantly higher than market cap.
Why does a company's market cap change daily even if it issues no new shares?
Market cap fluctuates because it is directly tied to the current share price, which changes every trading second based on supply and demand. Even with a fixed number of outstanding shares, positive news, earnings beats, or macroeconomic shifts can drive the price — and therefore market cap — up or down dramatically. This makes market cap a real-time measure of market sentiment rather than a static accounting figure. It is not the same as intrinsic value, which requires deeper fundamental analysis.