# 数据传输速率换算器（Mbps 转 MB/s）

> 将 Mbps 换算为 MB/s、Gbps 换算为 MB/s、kbps 换算为 kB/s。网络速度以比特每秒表示；文件大小和下载计量以字节表示。

交互版本：https://www.calcopenly.com/zh/conversion/data-transfer-rate-converter
主题：单位换算器

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.

## 输入

- **数值**: 输入源单位下的数值，也可以输入带有自身单位的数值
- **从** (选项：bit per second (bit/s), kilobit per second (kbit/s), megabit per second (Mbit/s), gigabit per second (Gbit/s), terabit per second (Tbit/s), byte per second (B/s), kilobyte per second (kB/s), megabyte per second (MB/s), gigabyte per second (GB/s), kibibyte per second (KiB/s), mebibyte per second (MiB/s), gibibyte per second (GiB/s))
- **到** (选项：bit per second (bit/s), kilobit per second (kbit/s), megabit per second (Mbit/s), gigabit per second (Gbit/s), terabit per second (Tbit/s), byte per second (B/s), kilobyte per second (kB/s), megabyte per second (MB/s), gigabyte per second (GB/s), kibibyte per second (KiB/s), mebibyte per second (MiB/s), gibibyte per second (GiB/s))

## 结果

- 转换后的数值 — 主要结果
- 换算
- 换算系数
- 精确性

## 公式

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

## 计算示例

### 100 Mbit/s in MB/s

- 数值: 100 Mbit/s
- 从: megabit per second (Mbit/s)
- 到: megabyte per second (MB/s)
- **转换后的数值: 12.5 MB/s**
- 核验来源：100 × 10⁶ bit/s ÷ 8 bit/B ÷ 10⁶ = 12.5

### 1 Gbit/s in MB/s

- 数值: 1 Gbit/s
- 从: gigabit per second (Gbit/s)
- 到: megabyte per second (MB/s)
- **转换后的数值: 125 MB/s**
- 核验来源：10⁹ / 8 / 10⁶ = 125

### 1 MiB/s in Mbit/s

- 数值: 1 MiB/s
- 从: mebibyte per second (MiB/s)
- 到: megabit per second (Mbit/s)
- **转换后的数值: 8.388608 Mbit/s**
- 核验来源：2²⁰ × 8 / 10⁶ = 8.388608

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

- 数值: 1 bit/s
- 从: bit per second (bit/s)
- 到: kilobyte per second (kB/s)
- **转换后的数值: 0.000125 kB/s**
- 核验来源：1 / 8 / 1000 = 0.000125

## 常见问题

### 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.

### “数据传输速率换算器（Mbps 转 MB/s）”有多准确？

准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：4。 例如，“100 Mbit/s in MB/s”根据100 × 10⁶ bit/s ÷ 8 bit/B ÷ 10⁶ = 12.5进行核验。

### 这种方法出自哪里？

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).

## 来源

- [NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C — General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)
- [NIST — Prefixes for binary multiples (IEC 80000-13)](https://physics.nist.gov/cuu/Units/binary.html)