Live network utility · no wallet connection

Bitcoin fee calculator.

Estimate what a Bitcoin transaction should cost right now. Adjust its inputs, outputs and address type, then compare priority rates in sats and USD.

Fee snapshot 7 November 2026 · mempool.space

Describe the transaction

Common payment: one input and two outputs. Coin-join, consolidation and multi-recipient transactions can be much larger.

Choose confirmation priority

141 sats
About $0.11 at the dated BTC snapshot
Estimated size141 vB
Fee rate1 sat/vB
BTC fee0.00000141 BTC
Mempool transactions51,827
Mempool size12.1M vB
Economy rate1 sat/vB

Rates are recommendations, not guarantees. Your wallet knows the exact transaction structure and may estimate a different size.

Why transaction size determines the fee

Bitcoin miners select transactions largely by fee rate, measured in satoshis per virtual byte (sat/vB). A payment spending several small coins can therefore cost more than a much larger payment spending one coin. The value sent is irrelevant to network size.

This calculator uses standard size estimates for common single-signature inputs. The exact signed transaction can differ because scripts, signatures and wallet behaviour vary.

Ways to avoid overpaying

  • Use a native SegWit or Taproot wallet.
  • Send at a quieter time when confirmation is not urgent.
  • Consolidate small inputs when fee rates are low.
  • Keep replace-by-fee enabled when your wallet supports it.
All Bitcoin toolsBuying guideMarket briefing

Calculate Bitcoin transaction fees from sat/vB

The estimate multiplies the transaction's estimated virtual size by the selected fee rate, then rounds up to whole satoshis. The amount of Bitcoin sent is not an input to this size estimate.

Example: one native SegWit input and two outputs

The calculator estimates ceil(10.5 + 68 × 1 + 31 × 2) = 141 vB. At a custom rate of 20 sat/vB, that gives 141 × 20 = 2,820 sats, or 0.00002820 BTC. The USD equivalent changes with the price source.

Adding inputs increases the estimated size. A change output is still an output. Different script types, signatures, multisignature arrangements and batching can change the real transaction size, so check the final fee shown by your wallet.

Fee recommendations come from mempool.space's documented API. They reflect changing demand and cannot guarantee a confirmation time. A saved fallback remains a dated snapshot. See source methods and the network tools.