How Does a Transaction’s Size Impact Its Chances of Being Included in a Block?

A transaction's size, typically measured in bytes or gas units, directly impacts its fee rate (fee/size). Miners prioritize transactions based on this fee rate, as it represents the most efficient use of the limited block space.

A larger transaction requires more block space. To be included, a larger transaction must offer a higher total fee or a higher fee rate than a smaller transaction competing for the same block space.