What Is the Maximum Number of Transactions a Block Can Hold?

The maximum number of transactions a block can hold is not a fixed number but is constrained by the block size limit, which is 1 megabyte for Bitcoin. The actual number depends on the size of the individual transactions.

For instance, smaller transactions (fewer inputs/outputs) allow for more transactions per block, while larger, more complex transactions reduce the total count. SegWit helped optimize this by changing how transaction data is counted.