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What Is a ‘Virtual Byte’ (Vbyte) in Bitcoin Transaction Sizing?

A vByte is a weighted unit of transaction size (introduced by SegWit) where witness data is counted as 1/4 of a regular byte.
Greeks.Live18.11.25

What Is a ‘Virtual Byte’ (Vbyte) in Bitcoin Transaction Sizing?

A virtual byte (vByte) is the unit of measure for transaction size introduced with the SegWit upgrade. It is a weighted measure, where the 'witness' data (like signatures) is counted as 1/4 of a regular byte.

This allows SegWit transactions to be prioritized and fit more data into the block weight limit, optimizing block space usage.

What Is the Maximum Size of a Bitcoin Block, and How Does It Relate to Congestion?
How Does the Segregated Witness (SegWit) Upgrade Affect the UTXO Model and Merkle Tree Structure?
What Is the Practical Block Size Limit in Bitcoin?
What Is the Ethereum Virtual Machine (EVM)?

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