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    Storage Calculator

    Calculate storage requirements for system design interviews with user data, retention, and replication

    Storage Parameters

    Configure your system's data generation and retention requirements

    Total active users in the system

    Posts, uploads, or data-generating actions

    Average size of each user operation (post, file, etc.)

    How long to keep the data before deletion

    Number of data copies for redundancy and availability

    Common Scenarios

    Quick presets for typical system design problems

    Results

    Quick Reference

    1 KB1,024 bytes
    1 MB1,024 KB
    1 GB1,024 MB
    1 TB1,024 GB
    1 PB1,024 TB

    Storage Technologies

    HDD
    ~$0.02/GB, 100 MB/s
    SSD
    ~$0.08/GB, 500 MB/s
    S3 Standard
    ~$0.023/GB/month
    S3 Glacier
    ~$0.004/GB/month