Estimate the on-disk size of a database table from row count and row width.
Item count times average size gives the raw payload; the overhead percentage covers the indexes, framing and metadata that always accompany the data itself. Results are shown in binary MB and GB (1,024-based), which is what tooling reports. Storage and transfer quotas are hard limits, and a table that is 15% larger than estimated is what turns a nightly job into a failed one.
Table Size
Total bytes = Rows in the table × Average row size × (1 + overhead)
Total bytes = Rows in the table × Average row size × (1 + overhead) Item count times average size gives the raw payload; the overhead percentage covers the indexes, framing and metadata that always accompany the data itself. Results are shown in binary MB and GB (1,024-based), which is what tooling reports.
Storage and transfer quotas are hard limits, and a table that is 15% larger than estimated is what turns a nightly job into a failed one.
This calculator takes 3 inputs: Rows in the table, Average row size, Structural or index overhead. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.