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データサイズ変換ツール

デジタルデータサイズの単位を変換 — バイト、キロバイト、メガバイト、ギガバイト、テラバイト、およびバイナリ単位に対応。

デジタルストレージ単位を変換 — 10進法(KB, MB, GB)と2進法(KiB, MiB, GiB)

結果
変換する値を入力してください
10進単位(KB, MB, GB)は1000の倍数、2進単位(KiB, MiB, GiB)は1024の倍数を使用します。OSやハードウェアによってサイズの表示が異なる場合があります。

How to Use This Tool

  1. 1

    Enter a data size value

    Type the numeric file or storage size you want to convert.

  2. 2

    Select the source unit

    Choose from bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, or their binary equivalents (KiB, MiB, GiB, TiB, PiB).

  3. 3

    Pick the target unit

    Select the unit to convert to. Use the swap button to quickly reverse the conversion direction.

  4. 4

    Compare all units at once

    The expanded table below the result shows your value in every data size unit — both decimal (SI) and binary (IEC) standards.

Frequently Asked Questions

What is the difference between MB and MiB?
MB (megabyte) uses the decimal standard: 1 MB = 1,000,000 bytes. MiB (mebibyte) uses the binary standard: 1 MiB = 1,048,576 bytes. Hard drive manufacturers use MB, while operating systems often use MiB.
How many gigabytes are in a terabyte?
In the decimal (SI) standard, 1 TB = 1,000 GB. In the binary (IEC) standard, 1 TiB = 1,024 GiB.
Why does my hard drive show less space than advertised?
Manufacturers label drives using decimal units (1 TB = 1,000 GB), but many operating systems display sizes in binary units (1 TiB = 1,024 GiB). This makes a 1 TB drive appear as roughly 931 GiB.
What are the binary IEC units?
IEC units (KiB, MiB, GiB, TiB, PiB) use powers of 1,024 instead of 1,000. They were introduced to eliminate confusion between decimal and binary interpretations of kilo, mega, giga, etc.