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データ転送速度換算（Mbps から MB/s）

Mbps から MB/s、Gbps から MB/s、kbps から kB/s に換算します。通信速度はビット毎秒、ファイルサイズやダウンロード表示はバイトで表されます。

更新日 検証済みの例：4

変換元の単位で数値を入力するか、単位付きの数値を入力します
試す
変換後の値
MB/s
変換後の値: 12.5 MB/s
有効桁数：12；最も近い値へ、等距離ならゼロから遠い値へ
単位換算
100 Mbit/s = 12.5 MB/s
換算係数
0.125
正確さ
正確

100 Mbit/sは正確に12.5 MB/sです。 1単位のメガビット毎秒は正確に0.125 MB/sです。

同じ量を各単位で表示

Mbit/s100 Mbit/sMB/s12.5 MB/s
100 Mbit/sを各データ転送単位で表示 行数：12
単位値定義
bit per second (bit/s)100,000,000基本単位
kilobit per second (kbit/s)100,0001 kbit/s = 1,000 bit/s、正確な値
メガビット毎秒 (Mbit/s)1001 Mbit/s = 1,000,000 bit/s、正確な値
gigabit per second (Gbit/s)0.11 Gbit/s = 1,000,000,000 bit/s、正確な値
terabit per second (Tbit/s)0.00011 Tbit/s = 1,000,000,000,000 bit/s、正確な値
byte per second (B/s)12,500,0001 B/s = 8 bit/s、正確な値
kilobyte per second (kB/s)12,5001 kB/s = 8,000 bit/s、正確な値
メガバイト毎秒 (MB/s)12.51 MB/s = 8,000,000 bit/s、正確な値
gigabyte per second (GB/s)0.01251 GB/s = 8,000,000,000 bit/s、正確な値
kibibyte per second (KiB/s)12,207.031251 KiB/s = 8,192 bit/s、正確な値
mebibyte per second (MiB/s)11.920931 MiB/s = 8,388,608 bit/s、正確な値
gibibyte per second (GiB/s)0.011641531 GiB/s = 8,589,934,592 bit/s、正確な値
計算方法 S

  1. メガビット毎秒からbit per secondへ換算

    100 Mbit/s×1,000,000 bit/sMbit/s=100,000,000 bit/s100\ \text{Mbit/s} \times 1{,}000{,}000\ \tfrac{\text{bit/s}}{\text{Mbit/s}} = 100{,}000{,}000\ \text{bit/s}

    1 Mbit/s = 1,000,000 bit/s、正確な値

  2. bit per secondからメガバイト毎秒へ換算

    100,000,000 bit/s÷8,000,000 bit/sMB/s=12.5 MB/s100{,}000{,}000\ \text{bit/s} \div 8{,}000{,}000\ \tfrac{\text{bit/s}}{\text{MB/s}} = 12.5\ \text{MB/s}

    1 MB/s = 8,000,000 bit/s、正確な値

  3. 統合した換算係数

    1 Mbit/s=1,000,0008,000,000 MB/s=0.125 MB/s1\ \text{Mbit/s} = \frac{1{,}000{,}000}{8{,}000{,}000}\ \text{MB/s} = 0.125\ \text{MB/s}

    両方の単位の定義が正確で、変換後の値は有限小数なので、表示されるすべての桁が正確です。

データ転送速度換算（Mbps から MB/s）について

Network speeds are quoted in bits per second and file sizes in bytes, and a byte is 8 bits, so megabits per second divide by 8 to give megabytes per second. Each rate unit is a fixed number of bits per second, with decimal prefixes (1 Mbit/s = 10⁶ bit/s) kept apart from binary ones (1 MiB/s = 2²⁰ bytes per second).

The default converts a 100 Mbit/s broadband plan to 12.5 MB/s, the most a download can show in megabytes per second, or 11.92 MiB/s in a program that counts in binary units. A 1 Gbit/s connection tops out at 125 MB/s.

Real transfers run below the line rate because every packet carries headers: over Ethernet with TCP/IPv4, at most 1,460 of every 1,538 bytes on the wire are data, 94.9%. The download time calculator applies that overhead to a file size.

計算例

100 Mbit/s in MB/s

値
100 Mbit/s
変換元
megabit per second (Mbit/s)
変換先
megabyte per second (MB/s)
変換後の値
12.5 MB/s

照合元：100 × 10⁶ bit/s ÷ 8 bit/B ÷ 10⁶ = 12.5

1 Gbit/s in MB/s

値
1 Gbit/s
変換元
gigabit per second (Gbit/s)
変換先
megabyte per second (MB/s)
変換後の値
125 MB/s

照合元：10⁹ / 8 / 10⁶ = 125

1 MiB/s in Mbit/s

値
1 MiB/s
変換元
mebibyte per second (MiB/s)
変換先
megabit per second (Mbit/s)
変換後の値
8.388608 Mbit/s

照合元：2²⁰ × 8 / 10⁶ = 8.388608

1 bit/s in kB/s (tiny value)

値
1 bit/s
変換元
bit per second (bit/s)
変換先
kilobyte per second (kB/s)
変換後の値
0.000125 kB/s

照合元：1 / 8 / 1000 = 0.000125

よくある質問

How many MB/s is 100 Mbps?

12.5 MB/s. Divide megabits per second by 8, because a byte is 8 bits: 100 ÷ 8 = 12.5. Programs that count in binary units show 11.92 MiB/s for the same speed, and protocol overhead takes about another 5%, so expect around 11.9 MB/s on a wired 100 Mbit/s link.

What is the difference between Mbps and MBps?

Mbps (Mbit/s) is megabits per second; MBps (MB/s) is megabytes per second, 8 times larger. Internet plans and Wi-Fi speeds are sold in Mbps, while browsers and download managers usually show MB/s, so a 50 Mbps plan appears as 6.25 MB/s. The case of the b is the only visible difference.

How fast is 1 Gbps in MB/s?

125 MB/s: 1,000,000,000 bits ÷ 8 = 125,000,000 bytes per second, which is 119.21 MiB/s in binary units. At that rate a 50 GB download takes 400 seconds, 6 min 40 s, before protocol overhead is added.

Why is my download slower than my internet speed?

Part of the gap is units and part is overhead. A plan quoted at 100 Mbit/s is 12.5 MB/s at most, and TCP/IP and Ethernet headers use about 5% of that, leaving about 11.9 MB/s. Wi-Fi signal, the far server and other devices on the connection reduce it further, which this converter does not model.

How many Mbps is 1 MiB/s?

8.388608 Mbit/s. One MiB/s is 1,048,576 bytes per second, and 1,048,576 × 8 = 8,388,608 bits per second. A tool that reports MiB/s therefore shows a number 4.6% lower than the same speed in MB/s.

「データ転送速度換算（Mbps から MB/s）」の精度はどのくらいですか？

精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。 独立した出典の解答と照合した計算例：4。 例えば、「100 Mbit/s in MB/s」は100 × 10⁶ bit/s ÷ 8 bit/B ÷ 10⁶ = 12.5と照合しています。

この計算方法の出典は何ですか？

NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement; NIST — Prefixes for binary multiples (IEC 80000-13).

この計算機について

xto=xfrom×ffromftof=one unit expressed in bit/s\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{bit/s} \end{gathered}

出典

  1. NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors
  2. NIST Handbook 44, Appendix C — General tables of units of measurement
  3. NIST — Prefixes for binary multiples (IEC 80000-13)

出典と照合済み

この計算機には、独立した出典の解答を使った計算例が 4 件あります。テストに組み込まれており、ここでも実行できます。

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