Block Size (Mean) measures the average size in bytes of all blocks produced within a given period, reflecting the density of transaction data being packed into each block and serving as a proxy for network throughput and on-chain demand for block space.
When mean block size rises, blocks are carrying more transaction data on average - indicating elevated on-chain activity, higher transaction volumes, or increased use of data-heavy transaction types. Sustained increases in mean block size relative to the protocol's maximum block size signal that the network is approaching capacity, which historically precedes fee market compression as users compete for limited block space. A declining mean block size reflects reduced on-chain demand, lower transaction throughput, or a shift toward more data-efficient transaction formats.
Tracked alongside transaction count and average fees, Block Size (Mean) provides a foundational view of network utilization - helping distinguish between periods where block space is abundant and fees are low versus periods of genuine congestion where demand for on-chain settlement is outpacing available capacity.
