Bitcoin Transaction Fee Calculator

This calculator multiplies your transaction's size in virtual bytes (vB) by a fee rate in satoshis per vByte (sat/vB) to get your total fee in satoshis. It pulls live sat/vB rates for four priority tiers from mempool.space's public fee-recommendations API, and live BTC/USD pricing from the same source the rest of this site uses, so the sats, BTC, and USD figures update to current network conditions rather than a fixed historical number.

Sat/vB (satoshis per virtual byte) is the standard unit for pricing Bitcoin block space. Your fee is your fee rate multiplied by your transaction's virtual size, not the dollar amount you're sending. Virtual size depends on address type: SegWit (bc1q) and Taproot (bc1p) addresses take fewer vBytes than legacy (1...) addresses for the same send, so they pay less at the same sat/vB rate. That's why the calculator's presets list different vByte counts for SegWit, Taproot, legacy, and a multi-input consolidation transaction.

The confirmation windows are typical estimates for each priority tier, not guarantees. Mempool.space derives them from recent block-inclusion patterns. A sudden demand spike, like a large Ordinals mint or an exchange batching a lot of withdrawals at once, can push actual confirmation past the estimated window even at the priority rate shown. If a transaction gets stuck, Replace-by-Fee (RBF) or Child-Pays-For-Parent (CPFP) can bump the effective rate after broadcast.

Small differences are normal. Your wallet computes the exact vByte count from your actual inputs and outputs, based on how many UTXOs you're spending and how many outputs you're creating, while this calculator uses standard presets for common transaction shapes. If your wallet is combining several small UTXOs or sending to multiple recipients in one transaction, its real vByte count, and therefore its fee, will run higher than the plain-send presets here. Use the custom vBytes field if your wallet shows you the exact figure.

If mempool.space's API is unreachable or blocked by your network, the calculator falls back to typical preset sat/vB rates and says so directly above the results. You can still get an accurate number by entering the current rate yourself in the custom rate field. Check mempool.space directly, or your own wallet's fee screen, for the live figure.

Up to a point, yes. Miners fill each block with the highest-paying transactions first, so a higher sat/vB rate generally confirms sooner. But paying far above the next-block rate does not confirm you any faster than one block, because a block can only hold so much data regardless of how much you overpay. See our full Bitcoin transaction fees guide for how the block-space auction actually works.

This calculator is on-chain only. It prices a standard Bitcoin transaction in sat/vB, the unit for competing for block space directly on the Bitcoin blockchain. Lightning Network payments use a completely different fee structure based on routing fees across payment channels instead of block space, so they don't fit this calculator's inputs at all. See /fees/lightning-network-fees for how Lightning fees actually work.

No. This calculator is built specifically for Bitcoin's own fee market and mempool.space data, which does not apply to Bitcoin Cash or other forks. Forked chains run separate networks with their own block-space demand and fee levels, usually far lower than Bitcoin's because of less competition for space, so using this calculator's numbers for a fork would give a badly wrong estimate. Check the fork's own fee-estimation tool or block explorer for an accurate figure on that specific chain.

That's a separate question from this page's network fee. This calculator only prices the on-chain miner fee to send BTC you already hold. It doesn't cover an exchange's trading or withdrawal fees. See /fees/coinbase-fees for Coinbase's current schedule specifically, or /fees/lowest-fee-crypto-exchange for a broader comparison of exchange trading fees.

No. A Bitcoin ATM fee is a separate, operator-set charge layered on top of the network fee this calculator prices, and ATM fees are typically far higher than a normal on-chain send. See /fees/bitcoin-atm-fees for how ATM fee structures actually work.

That's a tax-reporting question, separate from this page's network fee calculator. See /tax for how crypto sales and disposals are generally reported.