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Finance Calc Kit
Investments

Market Capitalization Calculator

Calculate market capitalization, share price, or total outstanding shares for any company instantly.

Company data

$

Market capitalization

$1.5B

Exact: $1,505,000,000.00

Size category

Small-cap ($300M to $2B)

Share price

$150.50

Outstanding shares

10,000,000

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Market capitalization and company size

Market capitalization (market cap) is the total market value of a company's outstanding equity. It equals the current share price multiplied by the number of shares outstanding. Investors use market cap to compare company size, build index portfolios, and screen stocks by category (large-cap, mid-cap, small-cap).

Solve for market cap, share price, or outstanding shares. Market cap reflects equity value only; for total firm value including debt and cash, use the enterprise value calculator. To compare valuation multiples, pair this with the EV to sales calculator.

Market cap formula

Market Cap=Share Price×Shares Outstanding\text{Market Cap} = \text{Share Price} \times \text{Shares Outstanding}

Share price is the latest traded price per common share. Shares outstanding include all issued shares minus treasury stock. Fully diluted counts may include options and convertible securities.

Worked example

A company trades at $150.50 per share with 10 million shares outstanding. Market cap = $150.50 × 10,000,000 = $1.505 billion, placing it in the small-cap range under common U.S. classification thresholds.

Size categories

  • Mega-cap: $200 billion and above
  • Large-cap: $10 billion to $200 billion
  • Mid-cap: $2 billion to $10 billion
  • Small-cap: $300 million to $2 billion
  • Micro-cap: $50 million to $300 million
  • Nano-cap: under $50 million

Frequently asked questions

Does market cap equal what it would cost to buy the company?
Not necessarily. An acquisition typically requires a control premium above the market price. Enterprise value also adds net debt and other claims beyond equity market cap.
Why does market cap change daily?
Share price fluctuates with trading activity, earnings news, and market sentiment. Shares outstanding change more slowly through buybacks, issuances, and conversions.
What is the difference between basic and diluted shares?
Basic shares count currently outstanding stock. Diluted shares add potential shares from options, warrants, and convertibles. Diluted market cap can be higher when many dilutive securities exist.
Is market cap the same as book value?
No. Market cap is the market price of equity. Book value is accounting net assets on the balance sheet. The two diverge when investors price growth, risk, and intangibles differently.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.