Database Size Estimator

bytes
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Math Updated 16 Jun 2026

Database Size Estimator calculates the estimated storage size of a database table. Raw Data (MB) = Rows × Cols × Bytes/Col / 1,000,000. Index Overhead = Indexes × 10%. Total = Raw × (1 + Index%). Growth = Raw × (1 + monthly%)^12.

Formula

Raw Data (MB) = Rows × Cols × Bytes/Col / 1,000,000 Index Overhead = Indexes × 10% Total = Raw × (1 + Index%) Growth = Raw × (1 + monthly%)^12

Example Calculation

Inputs
  • Number of Rows: 1000000
  • Avg Columns per Row: 20
  • Avg Bytes per Column: 50 bytes
  • Number of Indexes: 5
  • Monthly Growth Rate: 5 %

Suppose you enter: Number of Rows = 1000000, Avg Columns per Row = 20, Avg Bytes per Column = 50, Number of Indexes = 5, Monthly Growth Rate = 5. The calculator applies the formula (Raw Data (MB) = Rows × Cols × Bytes/Col / 1,000,000; Index Overhead = Indexes × 10%; Total = Raw × (1 + Index%); Growth = Raw × (1 + monthly%)^12) and shows all output values below. Change any input field to immediately see how the result changes.

Frequently asked questions

What is the Database Size Estimator?
The Database Size Estimator helps you estimate storage requirements for a database table, including index overhead and projected growth over 12 months.
When should I use this calculator?
Use this during database design to estimate storage capacity, plan hardware allocation, and understand the impact of indexes on database size.
What units should I enter?
Rows: table row count; Columns: average columns per row; Bytes/Column: average storage per column; Indexes: number of database indexes; Growth Rate: monthly percentage increase.
How accurate are the results?
Results are mathematically exact given the formula and your inputs. Rounding to decimal places may introduce small display differences.
How do I interpret the result?
Check that all inputs are in the valid range for the formula. Some operations (e.g. square root, division) require non-negative or non-zero values.
How can I verify the calculation manually?
Use the displayed formula and work through the numbers step by step. If your manual result differs slightly, check rounding and unit conversions first.
Can I use this for planning and budgeting?
Yes. Run best-case, expected, and worst-case inputs to compare outcomes and make safer planning decisions.