ποΈ Free Float Calculator
Shares actually available to trade.
Free-float percentage
Estimates for planning only, not financial advice.
Free float is the shares actually available for public trading: outstanding shares minus restricted, insider, and strategic holdings. With 100M shares outstanding and 35M locked up, free float is 65M shares, or 65.0% of the company. Index providers weight by this number, not by total shares.
How to Use This Calculator
Enter total shares outstanding and the shares not available to the public (insider holdings, government stakes, strategic blocks, treasury shares). The calculator returns the float in shares and percent.
Enter shares outstanding from the latest filing.
Enter restricted and insider-held shares.
Read the free float. For what the equity is worth on its cash flows, our intrinsic value calculator runs the DCF.
The Free Float Formula
Restricted means anything not freely tradable: founder and insider stakes, government holdings, cross-holdings, employee lock-ups, and treasury shares. Index giants like S and P Dow Jones and MSCI use float-adjusted market cap for weighting, so a company with 40% insider ownership gets 40% less index weight than its headline market cap suggests. Low float also means wilder price moves: fewer shares absorb each order, so volatility rises and short squeezes become possible.
Worked Example
100M shares outstanding, 35M restricted: float = 65M shares, 65.0%. At a $40 share price, headline market cap is $4B but float-adjusted cap is $2.6B, which is the number index funds actually buy against. Now a founder-controlled firm: 100M outstanding, 70M insider-held, float 30%. Every $1M of index buying chases 30M shares instead of 100M, tripling the price impact. That arithmetic is behind many small-cap squeezes.
Why Float Matters to You
Three practical effects. Liquidity: low-float stocks have wider spreads and gap on news, raising your trading costs. Index inclusion: float determines index weight, and index buying is the steadiest demand a stock gets. Takeover math: a buyer needs the float, not the total, so low float concentrates voting power and takeover premiums. Check the float before trading any stock under $5B; it explains price behavior that fundamentals cannot.
My screen: I want float above 50% for anything I might need to sell quickly, and I treat sub-20% floats as speculation regardless of the story. The shares that cannot trade still count in the valuation but not in your exit, and exits are what matter.
Estimates for planning only, not financial advice.
Frequently Asked Questions
What is free float?
The shares of a company available for public trading: total outstanding minus insider, government, strategic, and treasury holdings. It measures the genuinely tradable supply.
How do you calculate free float percentage?
Subtract restricted shares from shares outstanding, divide by shares outstanding, multiply by 100. Data comes from annual filings and insider ownership disclosures.
Why do indices use float-adjusted market cap?
Because index funds can only buy the float. Weighting by total shares would force funds to chase shares that are not for sale. S and P, MSCI, and FTSE all float-adjust.
Is low free float good or bad?
It cuts both ways: concentrated ownership often means aligned management, but trading gets volatile, spreads widen, and exits get harder. Below 20% float, treat the stock as speculative on liquidity grounds alone.
What causes free float to change?
Insider sales increase it; buybacks and going-private deals shrink it. Lock-up expiries after IPOs release big blocks at once, which is why IPO stocks often dip at expiry.
Free float vs outstanding shares?
Outstanding is every share issued minus treasury; float is the subset actually tradable. Headline market cap uses outstanding; investable market cap uses float.
How does float affect short squeezes?
Low float plus high short interest is the squeeze recipe: shorts must buy back from a tiny tradable supply. The float number tells you how explosive that setup can get.
Where do I find float data?
Company 10-K and proxy filings for insider holdings, plus data providers like Yahoo Finance and Bloomberg, which publish computed float figures. Recompute yourself on big positions.
Does free float affect volatility?
Yes, mechanically. Fewer tradable shares mean each order moves the price more, so low-float stocks swing harder on news. That extra volatility is a trading cost, not a return, and it persists regardless of fundamentals.
What is the minimum float for index inclusion?
S and P 500 requires at least 50% float-adjusted eligibility plus liquidity screens; many indices set 15-25% minimums. Falling below can mean index exclusion, which removes a major source of steady demand.
Can free float exceed 100%?
No, it is a percentage of shares outstanding. Figures above 100% in some datasets reflect short interest quirks or data errors, not real economics. Treat them as flags to investigate the data.
How do buybacks change free float?
They shrink both the float and the outstanding count, since repurchased shares become treasury shares. The float percentage can rise or fall depending on whose shares were bought, but liquidity usually tightens.