The total supply is the amount of cryptocurrency that has already been created, mined or issued at the moment. The total supply includes pre-mined, locked, and lost coins. However, it does not include burnt coins.
As a rule, the total supply of a cryptocurrency can be higher or equal to the circulating one. Also, note that the total supply is not the same as the max supply of a cryptocurrency. The total supply does not reflect the number of coins that will be created in the future.
Example:
On October 2, 2019, Bitcoin's total supply is equal to 17,969,137 BTC, Ethereum’s TS is 107,980,387 ETH and Zcash’s total supply is 7,540,119 ZEC.
Fact: Experienced traders pay attention to the total supply as it is an important metric to consider in the analysis. A significant increase in the number of coins or tokens (for example tokens locked in smart contracts until a specific date) on the market can bring down the value of the currency.