Bitcoin Transaction vBytes Calculator

What are vBytes?

Virtual Bytes (vBytes) is the unit used to measure transaction size for fee calculation. For SegWit transactions, vBytes account for the witness discount.

Typical Input Sizes:

• P2PKH (Legacy): ~148 bytes per input
• P2SH (SegWit wrapped): ~91 bytes per input
• Bech32 (Native SegWit): ~68 bytes per input
• Taproot: ~58 bytes per input

Typical Output Sizes:

• P2PKH: 34 bytes
• P2SH: 32 bytes
• Bech32: 31 bytes
• Taproot: 43 bytes

Fee Calculation:

Transaction Fee = vBytes × Fee Rate (sat/vB)
Example: 250 vBytes × 50 sat/vB = 12,500 sats

SegWit Savings:

SegWit (Bech32) and Taproot transactions are smaller due to witness data segregation, resulting in lower fees. Upgrading from legacy to SegWit can save 30-40% on fees.