Blockchain Transaction Fee Calculator

Bitcoin fees are based on transaction size in virtual bytes (vBytes), not the amount being transferred. Fee = Fee Rate (sat/vByte) x Transaction Size (vBytes). A simple one-input, two-output transaction is approximately 140-250 vBytes. Fee rates are set by the user and miners prioritize higher-fee transactions.

Satoshi per virtual byte (sat/vByte) is the unit used to express Bitcoin transaction fee rates. One satoshi is 0.00000001 BTC (one hundred-millionth of a Bitcoin). A fee rate of 10 sat/vByte means you pay 10 satoshis for every virtual byte of transaction data.

A standard P2PKH transaction with one input and two outputs is approximately 226 bytes. A SegWit (P2WPKH) transaction with one input and two outputs is approximately 141 vBytes. Multi-input or multi-output transactions are larger. SegWit transactions are smaller in virtual bytes and therefore cheaper at the same fee rate.

Ethereum fees are paid in gas. Each operation in a transaction uses a set amount of gas (defined in the Ethereum Yellow Paper), and you pay a gas price per unit. Total fee = Gas Used x (Base Fee + Priority Fee). Use the dedicated Ethereum Gas Fee Estimator for a more detailed breakdown of ETH fees.

Higher fee rates result in faster transaction confirmation. During periods of high network congestion, low-fee transactions may remain unconfirmed for hours or days. For time-sensitive payments, use a higher fee rate. For non-urgent transfers, a lower fee rate is fine.