Arithmetic on today's supply, not a forecast. It assumes nothing about whether Polkadot could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Polkadot has 1,722,164,673 DOT in circulation at $0.968 each, which is $1.67B. Holding that supply still and putting Ethereum's $282.25B in its place gives $163.8915 per DOT.
This is the huge end of the comparison. Polkadot would need $280.58B more than it carries today, and at that size it would be one of the largest assets in the world, crypto or otherwise.
Supply is held still, and in practice it moves: coins are minted, burned and unlocked, and every one of those changes the price a given market capitalisation implies. The figure also says nothing about whether the money exists to buy DOT at that level, which is the part that actually decides a price.
$163.8915 per DOT. That is Ethereum's current market capitalisation of $282.25B divided across the 1,722,164,673 DOT in circulation.
169x. Polkadot trades at $0.968 today and Ethereum's market cap is $282.25B against Polkadot's $1.67B.
No. It is one division: Ethereum's market capitalisation spread over the supply of DOT that exists today. It assumes nothing about whether Polkadot could attract that much money, and it holds the supply still when in practice supply changes.
It sets it. Market cap is price times circulating supply, so the same $282.25B of market cap spread over more coins gives a lower price per coin. This uses the 1,722,164,673 DOT in circulation now.