Bitcoin Transaction Fee Calculator — Estimate Your Fee by vBytes
Estimate your Bitcoin transaction fee: choose how many inputs and outputs you have by address type and a sat/vByte rate, and get the transaction size and fee in sats and BTC.
Method: virtual size (vB) = ~10.5 overhead + Σ(inputs) + Σ(outputs), then fee = size × your sat/vByte rate. Component sizes are the standard single-sig values from the transaction-size reference; see the address-types reference for which type your addresses are, and live fee tiers on the network vitals. Holding lots of small UTXOs? The UTXO consolidation calculator tells you whether merging them in this fee window pays off. Estimates for standard transactions; multisig and unusual scripts differ.
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Last reviewed June 20, 2026.