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How do I know a Bitcoin transaction size?

In the digital world the storage of information is measured in bytes. The size of bitcoin transactions is also measured in bytes. The larger transaction is, the more commission needs to be paid in order transaction to be confirmed as soon as possible. 

What does the transaction size depend on?

It does not depend on the amount of bitcoins you send, but it depends on the number of incoming addresses (inputs) and outgoing addresses (outputs) involved in a single transaction.

As a reference we have two minimum transaction weights that are very indicative:

  • First minimum weight: 192 bytes approx

This transaction consists of one incoming address (from which money was sent) and one outgoing address (the one that receives the money).

*The following image is a randomly chosen transaction in a block explorer to demonstrate the theoretical explanation.

  • Second minimum weight: 226 bytes approx

This transaction consists of one incoming address (from which money was sent) and two outgoing addresses (the one that receives the money and third one receiving the change or "return").

*The following image is a randomly chosen transaction in a block explorer to demonstrate the theoretical explanation.


From this point on, a bitcoin transaction can have as many incoming and outgoing addresses as necessary. As addresses are added, the number of bytes increases such as miner fees in order to confirm a transaction.


Click here to read more information about How to know the status of a cryptocurrency transaction



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