How the Free Float Calculator works
Free float is the slice of a company's shares outstanding that is actually available for the public to buy and sell. It excludes shares held by insiders, promoters, governments, and other strategic parties who are not expected to trade them day to day. Free float matters because it drives how easily a stock can be bought or sold without moving the price, and because most major stock indexes weight their constituents by free-float-adjusted market capitalization instead of total market capitalization.
The formula
Start from total shares outstanding and subtract every category of restricted holding:
Free Float Shares = Total Shares Outstanding − Restricted Shares
where Restricted Shares is the sum of insider & promoter holdings plus other locked-in shares (government stakes, ESOP trust shares, strategic cross-holdings, or shares under a lock-up period). From there:
Free Float % = (Free Float Shares ÷ Total Shares Outstanding) × 100
Free-Float Market Cap = Free Float Shares × Share Price
The calculator also reports total market capitalization (Total Shares Outstanding × Share Price) so you can compare the free-float-adjusted figure against the company's full market value.
Worked example
Take a company with 100,000,000 shares outstanding, 32,000,000 shares held by insiders and promoters, 8,000,000 shares locked in an ESOP trust and government stake, and a share price of $45.00. Restricted shares total 40,000,000, so free float shares are 100,000,000 − 40,000,000 = 60,000,000 shares, or a free float of 60%. Free-float market cap is 60,000,000 × $45.00 = $2,700,000,000, compared with a total market cap of 100,000,000 × $45.00 = $4,500,000,000.
What counts as restricted
- Insider and promoter holdings: shares held by founders, executives, directors, and their close affiliates, which are typically held long-term rather than actively traded.
- Government or strategic stakes: shares held by a government body or another company for policy or control reasons rather than for trading.
- Locked-in or trust shares: shares held in an ESOP trust, under a post-IPO lock-up agreement, or otherwise contractually restricted from sale for a period of time.
Why free float matters
A low free float means fewer shares are actually changing hands, which tends to widen bid-ask spreads and make the price more sensitive to any single large order. It can also affect index eligibility: many index providers require a minimum free-float percentage before including a stock, and once included, they weight it by free-float-adjusted market cap rather than total market cap, so two companies with the same total market value can carry very different index weights if their free float differs.