CPFP (Child Pays for Parent) Calculator

Try it here: https://tomunchained.github.io/cpfp_calculator/

This is a tool to help you calculate a fee rate to choose for a CPFP transaction, which will result in an effective fee rate for the original transaction that is very close to the current high prioirty fee rate.

IMPORTANT: This tool assumes the CPFP transaction will use 1 input and 1 output, the simpliest method of achieving a CPFP acceleration. It also assumes no other CPFP or RBF accelerations are involved.

To learn more about input types and output types, visit: https://unchained.com/blog/bitcoin-address-types-compared/

To learn more about how these types affect transaction size (and thus fees) visit: https://bitcoinops.org/en/tools/calc-size/