Free Float Calculator
Enter a company's total shares outstanding, restricted shares, and closely-held shares to get the tradable free float, the free float percentage, and the float-adjusted market capitalization. The results update as you type, with a gauge showing where the float falls on the low-to-high liquidity scale.
Formula
Worked example
A company has 10,000,000 shares outstanding. Management holds 2,000,000 closely-held shares and employees have 1,000,000 shares still vesting (restricted). Non-tradable shares total 3,000,000. Free float = 10,000,000 - 3,000,000 = 7,000,000 shares. Free float % = 7,000,000 / 10,000,000 x 100 = 70%, which is in the optimal band. At $25 per share, float-adjusted market cap = 7,000,000 x $25 = $175,000,000.
What is free float?
Free float is the portion of a company's shares that are genuinely available for buying and selling on the open market. It is calculated by subtracting two categories of non-tradable shares from the total shares outstanding: restricted shares (typically employee awards under lock-up or post-IPO blocking periods) and closely-held shares (stakes owned by founders, controlling shareholders, governments, or strategic investors who hold long-term and rarely sell). The resulting figure - the free float - represents the shares that change hands freely through stock exchanges every trading day. Because free float reflects actual supply, it is a more practical measure of liquidity than the raw shares outstanding number.
How to calculate free float and free float percentage
The core formula is: Free Float = Shares Outstanding - Restricted Shares - Closely-Held Shares. The free float percentage expresses that figure relative to total outstanding shares: Free Float % = (Free Float / Shares Outstanding) x 100. For example, a company with 10,000,000 shares outstanding, 1,000,000 restricted shares, and 2,000,000 closely-held shares has a free float of 7,000,000 shares and a free float percentage of 70%, which falls squarely in the optimal band. When a current share price is available, float-adjusted market capitalization is simply Free Float x Share Price. This figure is the weighting input used by the S&P 500, MSCI, FTSE Russell, and most other major index families rather than full market capitalization.
Why free float matters for investors
Free float is a direct proxy for a stock's liquidity. A low free float means fewer shares chase each trade, so even modest order flow can move the price significantly, widening bid-ask spreads and increasing the cost of getting in or out of a position. This is why low-float stocks are popular with short-term traders hunting large percentage moves - but they also carry higher manipulation risk. A classic example is the 2018 Tilray incident: with only about 23% free float, the cannabis company saw its stock price rise from $45 to $300 in a single trading session before trading halts were imposed. Institutional investors such as mutual funds and pension plans typically avoid stocks with a free float below 25%-30% because they cannot build or exit meaningful positions without disturbing the price.
Free float and index inclusion
Most major equity indices weight their constituents by float-adjusted market capitalization rather than total market cap, so free float directly affects how much weight a company carries in an index. Beyond weighting, many indices set minimum float thresholds for inclusion. The FTSE UK index series requires a minimum free float of 25% for UK-incorporated companies. The Russell US Indexes exclude companies where less than 5% of shares are in the public float. MSCI classifies floats below 15% as restricted investable market candidates and typically excludes stocks with very low floats from its Investable Market Index. For companies targeting index inclusion, a low free float can be a structural obstacle, even if total market capitalization is large.
Free float percentage bands
| Free float % | Band | Liquidity profile | Typical investor concern |
|---|---|---|---|
| 0% - 10% | Very low | Severely constrained | Index exclusion, manipulation risk |
| 10% - 25% | Low | Constrained | High volatility, wide spreads |
| 25% - 40% | Below optimal | Moderate | Limited institutional participation |
| 40% - 80% | Optimal | Good | Balanced insider alignment and liquidity |
| 80% - 100% | High | Excellent | Low insider control, stable pricing |
Widely-used industry guidelines for classifying a stock by the proportion of freely tradable shares. Thresholds vary by data provider; figures below reflect common practitioner conventions and RoboForex / MSCI guidance.
Frequently asked questions
What is the difference between shares outstanding and free float?
Shares outstanding is the total number of shares a company has ever issued. Free float is the subset of those shares that are actually available for public trading. The difference is made up of restricted shares (which cannot yet be sold due to lock-up periods or vesting schedules) and closely-held shares (retained by insiders and strategic investors who are unlikely to sell). For most large-cap companies, shares outstanding and free float are close. For newly listed or founder-controlled companies, the gap can be substantial.
What is a good free float percentage?
A free float between 40% and 80% is generally considered optimal. It provides enough tradable supply to support institutional participation and stable price discovery while keeping meaningful insider alignment. Below 40% the stock can become difficult to trade in size without moving the price, which institutional investors find problematic. Above 80% there is ample liquidity but it may also signal low insider skin-in-the-game. Thresholds vary by market: emerging markets, for example, commonly see lower floats than developed markets.
What are restricted shares?
Restricted shares are shares that exist but cannot be sold on the open market until specific conditions are met. Common examples include employee stock options and restricted stock units (RSUs) that are still vesting, shares issued to executives that are subject to a holding period, and shares distributed during an IPO that are locked up for 90 to 180 days afterward. Once the restriction lifts, those shares flow into the free float, which can temporarily increase supply and put downward pressure on the price.
What are closely-held shares?
Closely-held shares are shares owned by major long-term shareholders such as founders, family members, the founding management team, government entities, or strategic corporate investors. Unlike restricted shares, there is no legal barrier preventing the sale of closely-held shares. However, these holders rarely trade in the open market, either because they wish to retain control, are subject to disclosure obligations that make large sales visible and market-moving, or are restricted by insider trading windows. Standard practice is to exclude them from the free float calculation because they do not contribute to real daily trading liquidity.
How does free float affect an index weighting?
Most modern indices, including the S&P 500, MSCI World, and FTSE 100, weight companies by float-adjusted market capitalization rather than total market cap. Float-adjusted market cap equals the free float share count multiplied by the current share price. A company with 50% free float will carry roughly half the index weight it would carry if calculated on total market cap. This methodology prevents indices from being distorted by large illiquid stakes: without it, a company whose founder holds 80% of shares would appear far more dominant in the index than its actual tradable size warrants.
Why are low-float stocks more volatile?
With a small free float, the available supply of shares is thin. A single institutional purchase or a surge in retail interest can absorb a disproportionate chunk of the float in a short time, driving the price up sharply. The same effect works in reverse on selling. There is no large pool of shares to absorb order flow, so price impact per share traded is high. This also makes low-float stocks easier to manipulate: a well-timed large order can force a significant price move that would be impossible in a high-float stock.
Can free float change over time?
Yes, and it changes frequently. Free float increases when lock-up periods expire after an IPO, when restricted stock units vest and employees sell, when insiders sell shares via secondary offerings, or when a company buys back shares and the remaining pool is more concentrated among the public. Free float decreases when a company issues new shares to insiders or management, when a strategic investor builds a controlling stake, or when a government entity acquires a large holding. Investors tracking a specific stock should check for upcoming lock-up expirations, which are a predictable source of float expansion.