Transactions & fees

TXID Calculator

Understand transaction identifiers and their distinction from witness identifiers.

Runs locally

Security & privacy. Calculations run locally. Check the network and inputs. Estimates of fees, policy acceptance, prices and future block timing are not guarantees.

Use this tool

Calculates on your device. Results that depend on future blocks or policy are estimates.

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What this tool is for

A transaction ID identifies a Bitcoin transaction using its non-witness serialization. Witness transactions also have a wtxid. A calculator should label the two instead of presenting them interchangeably.

Supported behavior

Use the labeled inputs above, review the result, and clear sensitive data when finished.

Security & privacy

Calculations run locally. Check the network and inputs. Estimates of fees, policy acceptance, prices and future block timing are not guarantees.