Transactions & fees

CPFP Fee Calculator

Learn how a child transaction can affect a transaction package’s fee rate.

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.

Single parent and child. Apply the child's standalone relay floor separately; package acceptance is not guaranteed.

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What this tool is for

Child-pays-for-parent uses a child spending an available parent output. The combined fee and size help assess the package, but relay and mining policies can affect the result.

Supported behavior

Single parent and child. Apply the child's standalone relay floor separately; package acceptance is not guaranteed.

Security & privacy

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