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How Do Wallet Software Providers Help Users Estimate the Size of Their Transaction?

Wallets simulate the transaction construction (inputs, outputs, signatures) to calculate the total size in bytes for fee estimation.
Greeks.Live19.11.25

How Do Wallet Software Providers Help Users Estimate the Size of Their Transaction?

Wallet software providers help users estimate transaction size by simulating the construction of the transaction before it is broadcast. The wallet calculates the number of inputs required to cover the amount, the number of outputs (recipient and change), and the data overhead for the transaction structure and signatures.

This calculation provides an accurate estimate of the transaction's total size in bytes. The wallet then uses this size estimate, along with current network fee rate data, to suggest an appropriate total fee to the user.

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