# Possible bug in transaction size calculation

**URL:** <https://bisq.community/t/possible-bug-in-transaction-size-calculation/2490>\
**Category:** Support\
**Created:** [July 20, 2017, 12:24pm UTC](https://bisq.community/t/possible-bug-in-transaction-size-calculation/2490 "2017-07-20T12:24:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gabriel](https://bisq.community/letter_avatar/gabriel/32/5_5575768a8748004e209b776fc1b2916d.png) [@gabriel](https://bisq.community/u/gabriel)\
**Post date:** [July 20, 2017, 12:24pm UTC](https://bisq.community/t/possible-bug-in-transaction-size-calculation/2490/1 "2017-07-20T12:24:34Z")

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Hi, I’ve been noticing a consistent discrepancy in transaction size between what is displayed in Bisq and what one sees on tradeblock once a transaction is broadcast. Specifically, the size is about 15% smaller than that displayed on tradeblock when sending a simple transaction out of the Bisq wallet to an external address.

When sending a low-priority transaction, a 15% difference in fee can make the difference between confirmation in under an hour and stuck in the mempool for days or weeks, so this is a serious bug!