Bitcoin Transaction vBytes Calculator
UTXOs being spent
Destinations (recipient + change)
Bitcoin Transaction Sizes
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.
💡 Tips for Lower Fees:
- Use SegWit (Bech32) or Taproot addresses
- Consolidate UTXOs when fees are low
- Batch multiple payments into one transaction
- Fewer inputs = smaller transaction size
- Use RBF (Replace-By-Fee) to adjust fees if stuck
About This Calculator
This bitcoin transaction vbytes calculator helps you move from raw inputs to a decision-ready output in seconds.
Inside blockchain & crypto, this tool gives you a practical way to model scenarios, compare outcomes, and make better next-step decisions without spreadsheet overhead.
If your workflow expands, pair this calculator with Bitcoin Block Reward Calculator and Bitcoin Total Supply Calculator to cross-check assumptions and build a stronger analysis chain.
Formula
Use the calculator inputs to apply the underlying method and return a consistent result instantly.
Example Calculation
The worked example below demonstrates how the input fields translate into the final output. Use it as a quick validation pass before entering your own numbers.
- input value: 10
- comparison value: 4
Explanation of Results
Result Interpretation
The bitcoin transaction vbytes calculator returned computed result based on input value 10 and comparison value 4. Use this result as a baseline, then adjust one input at a time to understand how sensitive your outcome is before making decisions.
FAQ
How should I validate the bitcoin transaction vbytes calculator result?
Run a second scenario with rounded numbers, then compare the direction and magnitude of the change before using the value operationally.
What formula is this based on?
This page uses the following formula logic: Use the calculator inputs to apply the underlying method and return a consistent result instantly.
Can I bookmark this blockchain & crypto tool?
Yes. Use the canonical URL /finance-economics/blockchain-crypto/bitcoin-transaction-vbytes-calculator to return to this calculator in the Finance & Economics library.
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See Also
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