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    Data Storage Converter

    Convert between data storage units

    How It Works

    Overview

    A data storage converter translates a quantity in one digital-information unit into another — bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and so on. It is the most common everyday tool for sizing files, comparing drive capacities, estimating bandwidth, and reasoning about cloud costs.

    The wrinkle that trips most people up is that "kilo," "mega," and "giga" have two definitions in computing. Historically, programmers used powers of two (1 KB = 1,024 bytes) because memory chips and disk sectors are sized that way. The SI committee and disk manufacturers prefer powers of ten (1 KB = 1,000 bytes). To resolve the ambiguity, the IEC introduced binary prefixes — kibi (KiB), mebi (MiB), gibi (GiB) — but the older overloaded names persist in everyday use.

    The Formula

    value_target = value_source × (factor_source / factor_target)

    This calculator uses these factors (in bytes):

    • 1 bit = 0.125 B (8 bits = 1 byte)
    • 1 KiB / 1 KB (binary) = 1,024 B = 2^10
    • 1 MiB = 1,048,576 B = 2^20
    • 1 GiB = 1,073,741,824 B = 2^30
    • 1 TiB = 1,099,511,627,776 B = 2^40
    • 1 PiB = 1,125,899,906,842,624 B = 2^50

    Decimal-prefix equivalents (used by storage manufacturers) are 1 KB = 1,000 B, 1 MB = 10^6 B, 1 GB = 10^9 B, etc. The percentage gap grows as you climb prefixes: ~2.4% at KB, ~4.9% at MB, ~7.4% at GB, ~10% at TB.

    Worked Example

    You bought a 500 GB SSD. The package uses decimal: 500 × 10^9 = 500,000,000,000 bytes. To see what your operating system will report:

    • 500,000,000,000 B ÷ 1,073,741,824 B/GiB ≈ 465.66 GiB

    Now estimate how many 4K videos fit. If a one-hour 4K stream is roughly 7 GB on disk:

    • 465.66 GiB × 1.0737 GB/GiB ÷ 7 GB ≈ 71 hours of 4K video

    When to Use This

    • Sizing storage purchases — translate manufacturer-advertised TB into the GiB your OS will actually display.
    • Bandwidth math — convert between Mbps (megabits per second) and MB/s (megabytes per second) to estimate download time.
    • Cloud cost estimation — providers bill in GB or TB; reconcile with file sizes reported in MiB or GiB.
    • Backup planning — sum file sizes across mixed reporting (KB, MB, GB) into one consistent unit.
    • Network capacity — convert PB throughput per month into average Gbps required.

    Common Mistakes to Avoid

    • Confusing bits with bytes. "Mb" (megabit) and "MB" (megabyte) differ by a factor of 8 — the case of the b matters.
    • Mixing decimal and binary prefixes. Saying "1 GB of RAM" usually means 1 GiB; saying "1 GB of disk" usually means 10^9 bytes. The same label means different things in different contexts.
    • Forgetting filesystem overhead. Formatted capacity is always less than raw — NTFS, ext4, and APFS each reserve metadata that shrinks the visible total by 0.5–3%.
    • Rounding bandwidth ÷ 8 to get MB/s. Real throughput sees TCP/IP overhead and protocol losses, typically 10–20% below theoretical.
    • Treating PB as "very rare." Modern data lakes and CDN caches routinely operate in petabytes; cumulative archives reach exabyte scale.

    Frequently Asked Questions

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