Market Cap vs. Circulating Supply Explained
A coin trading at just $1 sounds cheap. But if a trillion of them exist, that "cheap" coin actually has a trillion-dollar market cap. Price alone tells you almost nothing — these numbers tell you what's really going on.
What Is Market Cap?
Market capitalization measures the total value of a cryptocurrency's circulating supply. The formula is simple:
Market Cap = Current Price × Circulating Supply
If a coin trades at $50 with 10 million coins currently in circulation, its market cap is $500 million. This is the number most commonly used to compare the relative size of different cryptocurrencies — Bitcoin's market cap sits in the trillions, while a small-cap token might be worth only a few million.
What Is Circulating Supply?
Circulating supply is the number of tokens actually available and tradable right now — coins that can realistically move between wallets and exchanges today. It's different from total supply (all tokens that currently exist, including those locked or reserved) and max supply (the absolute cap on how many will ever exist, if one is set at all).
What Is Fully Diluted Valuation (FDV)?
Fully diluted valuation estimates what a project would be worth if its entire maximum supply were in circulation at today's price:
FDV = Current Price × Total (or Max) Supply
Say a token trades at $2, with 20 million coins circulating out of 100 million that will eventually exist. Its market cap is $40 million — but its FDV is $200 million. That gap represents real future dilution: as more tokens unlock and enter circulation, that supply increase can put downward pressure on price unless demand grows fast enough to absorb it.
Why the Gap Between Them Matters
A large gap between market cap and FDV is a legitimate warning sign worth investigating. It means a large portion of the token supply is still locked, and future unlocks represent latent selling pressure that current holders will eventually face. Bitcoin, by contrast, has already mined over 93% of its total 21 million supply, so its market cap and FDV are nearly identical — there's very little future dilution left to worry about.
How to Use These Numbers in Practice
Check a project's vesting schedule and unlock dates alongside its FDV — a big gap combined with unlocks coming soon deserves real scrutiny.
Don't judge a coin's value by price alone — a low unit price says nothing about whether a project is actually small or large.
Compare market cap, not price, when sizing up how established one project is relative to another.
Key Takeaways
Market cap equals current price multiplied by circulating supply — it measures a token's value today.
Fully diluted valuation estimates value if the entire max supply were already circulating.
A large gap between market cap and FDV signals significant future dilution as more tokens unlock.
Price alone is a poor way to judge a token's actual size or value — market cap and supply context matter far more.
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