How to measure the size of one record in a table

Yuki21
Tera Expert
Is it possible to measure the approximate size of one record in a table by the following method?

<Measurement method>
Check the difference between the Primary DB size (MB) of the Application Usage Overview before and after adding the record to the table.
* Create 10,000 records and divide the difference by 10,000

Is the Primary DB size (MB) reflected immediately after adding a record?