Transfer BTCs without fees

The fact that you need to pay a transaction or not is determined by the priority of a transaction.

Currently the priority of a transaction is calculated with this formula.

priority = sum(input_value_in_base_units * input_age)/size_in_bytes

The minimum transaction priority for free transactions is actually 57,600,000.

~~Because you have all the coins in the same transaction output~~ and I guess you will send them to one unique address the transaction size will be about 250 bytes. You have:

min_free_input_age = (min_priority_for_free_tx * size_in_bytes)/input_value_in_base_units
min_free_input_age = (57600000 * 250) / 38000000
min_free_input_age = ~378

So you have to wait 378 blocks (~3 days) before you can spend your coins without TX fee. But note that once sent it will probably take 2 or 3 days more before the transaction will be added in a block.

Please correct me if there is a calculation error.

Jan Moritz

Posted 2013-12-15T18:23:12.553

Reputation: 771

I have all of them on an unique address, but I originally received them on 3 separate addresses. Does that matter? And if it does not: why doesn't the client transfer all the Bitcoins on to a single address before sending them? – rrrrrrrrrrrrrrrr – 2013-12-16T15:47:47.110

I've written the answer too fast. The import thing is not to have them on the same address but in the same transaction output. – Jan Moritz – 2014-05-21T19:08:51.827

Do you have a number of very small unspent transactions? If so, you will be required to pay a fee as a result. – ScripterRon – 2013-12-15T19:00:09.800

I would also like to know the answer to do this. Back in the day, bitcoin transaction fees were optional. I don't know if this is coded into the bitcoin network or simply the client. – mosca1337 – 2013-12-15T19:58:18.370

Transfer BTCs without fees

Answers