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What Is the Maximum Size of a Bitcoin Block, and How Does It Relate to Congestion?

The block size limit (nominally 1MB, effectively up to 4MB with SegWit) limits transaction throughput, causing congestion when demand is high.
Greeks.Live18.11.25

What Is the Maximum Size of a Bitcoin Block, and How Does It Relate to Congestion?

The maximum size of a Bitcoin block is technically 4 megabytes (MB) under the SegWit upgrade, though the base block size limit is 1MB. This limit restricts the number of transactions that can be processed in a 10-minute interval.

When demand for transaction space exceeds this limit, it causes congestion, pushing transaction fees higher as users compete for the limited space.

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