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Tarek Aloui TarekAloui

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mwakaba2 / system_design_numbers_cheat_sheet.md
Last active October 7, 2025 15:49
Updated easy to remember system design numbers for back-of-the-envelope calculations

Updated, easy to remember numbers for back-of-the-envelope calculations in system design interviews

Powers of two table

Power    Approx Value (Bytes)       Bytes
-----------------------------------------
10                 1 thousand        1 KB
16                65 thousand       64 KB
20                  1 million        1 MB
30 1 billion 1 GB