Why does Native SegWit (bc1q) save fees compared to Legacy (1)?

Segregated Witness (SegWit) isolates signature data into a witness field that is discounted by 75% in block weight calculations. Standard 1-input 2-output Native SegWit transfers consume ~140 vB versus ~225 vB for Legacy, saving ~38% on every transaction.

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Bitcoin Transaction Fee Estimator

Verify current mempool sat/vB priority tiers, compare SegWit vs Taproot byte weights, and calculate exact dollar costs before broadcasting transactions.

Transaction Type & Weight

Choose Address Format

Native SegWit (Bech32 - bc1q)

Standard 1-in 2-out: ~140 vBytes (Recommended)

140 vB

Taproot (Bech32m - bc1p)

Schnorr signatures: ~110 vBytes (Smallest size)

110 vB

Legacy (P2PKH - 1...)

Uncompressed witness: ~225 vBytes (Highest cost)

225 vB

Custom Fee Rate: 18 sat/vB

Estimated Network Fee

$2.23

Based on live BTC price of $88,500

Total Satoshis:2,520 sats

Total Bitcoin:0.00002520 BTC

Virtual Size:140 vBytes

Calculation: Total Fee = vBytes × sat/vB. Never pay more than current mempool demands.

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Bitcoin Fee Questions & Answers

Sat/vB stands for Satoshis per Virtual Byte. Miners have a hard block weight limit (4,000,000 weight units or 1MB virtual capacity per block). They choose transactions that offer the highest fee density per virtual byte.