<p>Since the block size is fixed (but has changed since genesis block) there are 2 main reasons:</p>

<ol>
<li>Transactions are not all the same size in bytes. One transaction can have multiple inputs and outputs, increasing the size of the tx in bytes.</li>
<li>The market might not fill a block with transactions (esp. in the beginning blocks) because usage is low.</li>
</ol>

CC BY-SA 4.0
2018-08-21T13:39:57.280Z
2018-08-21T13:39:57.280Z
JBaczuk
<p>why sometimes block has 16 transactions and sometimes over 2000?
I checked it on <a href="https://blockexplorer.com/blocks" rel="nofollow noreferrer">https://blockexplorer.com/blocks</a>.
Thank you</p>

<transactions><block>
Number of transactions in block
jakub
# Number of transactions in block

(Asked by: username_0 on 2018-08-21)

why sometimes block has 16 transactions and sometimes over 2000?
I checked it on <https://blockexplorer.com/blocks>.
Thank you

**Tags:** transactions, block


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## 1 answers

### Answer by username_1 on 2018-08-21. Score: 1 | Accepted answer

Since the block size is fixed (but has changed since genesis block) there are 2 main reasons:

1. Transactions are not all the same size in bytes. One transaction can have multiple inputs and outputs, increasing the size of the tx in bytes.
2. The market might not fill a block with transactions (esp. in the beginning blocks) because usage is low.


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