🔊 音频文件大小计算器Audio File Size Calculator

使用说明与常见问题How-to & FAQ

「音频文件大小计算器」是什么？What is the Audio File Size Calculator tool?

估算音频文件大小：压缩格式按 大小 = 比特率 × 时长 ÷ 8（如 MP3 128 kbps）；未压缩 PCM/WAV 按 采样率 × 位深 × 声道数 × 时长 ÷ 8。给出字节、KB/MB（十进制）和 KiB/MiB（二进制）及每分钟大小。Estimate an audio file's size: for compressed formats, size = bitrate × duration ÷ 8 (e.g. MP3 at 128 kbps); for uncompressed PCM/WAV, sample rate × bit depth × channels × duration ÷ 8. Shows bytes, KB/MB (decimal) and KiB/MiB (binary), plus size per minute.

如何使用「音频文件大小计算器」？How do I use the Audio File Size Calculator tool?

在「音频文件大小计算器」中，填写「音频类型」、「比特率（kbps）」、「采样率（Hz）」、「位深（bit）」、「声道数」等参数，结果会随输入实时计算并显示在下方。In the Audio File Size Calculator: Fill in "Audio type", "Bitrate (kbps)", "Sample rate (Hz)", "Bit depth (bits)", "Channels"; results are recalculated instantly as you type.

压缩音频的大小怎么估算？How is a compressed file's size estimated?

大小 ≈ 比特率 × 时长 ÷ 8。例如 128 kbps 的 MP3 播放 3 分钟：128,000 bit/s × 180 s ÷ 8 = 2,880,000 字节 ≈ 2.88 MB。实际文件因容器开销、ID3 标签和可变比特率（VBR）会略有出入。Size ≈ bitrate × duration ÷ 8. A 128 kbps MP3 lasting 3 minutes is 128,000 bit/s × 180 s ÷ 8 = 2,880,000 bytes ≈ 2.88 MB. Real files vary slightly because of container overhead, ID3 tags and variable bitrate (VBR).

未压缩 PCM/WAV 怎么算？How is uncompressed PCM/WAV calculated?

大小 = 采样率 × 位深 × 声道数 × 时长 ÷ 8。例如 CD 音质（44,100 Hz、16 bit、立体声）每分钟约 10.1 MiB。WAV 还有 44 字节左右的文件头，这里忽略不计。Size = sample rate × bit depth × channels × duration ÷ 8. CD quality (44,100 Hz, 16-bit, stereo) is about 10.1 MiB per minute. A WAV file also has a header of around 44 bytes, which is ignored here.

MB 和 MiB 有什么区别？What is the difference between MB and MiB?

MB 是十进制（1 MB = 1,000,000 字节），常用于标注比特率和存储容量；MiB 是二进制（1 MiB = 1,048,576 字节），操作系统显示文件大小时常用。两者都给出以便对照。MB is decimal (1 MB = 1,000,000 bytes), used for bitrates and storage marketing; MiB is binary (1 MiB = 1,048,576 bytes), used by operating systems when showing file sizes. Both are given for comparison.

能反过来估算比特率或时长吗？Can it work backwards to bitrate or duration?

本工具只做正向估算。若已知文件大小想反推，可用：比特率(kbps) ≈ 文件大小(字节) × 8 ÷ 时长(秒) ÷ 1000，或 时长 ≈ 文件大小 × 8 ÷ 比特率。This tool only estimates forwards. To work backwards from a known size, use bitrate (kbps) ≈ size (bytes) × 8 ÷ duration (seconds) ÷ 1000, or duration ≈ size × 8 ÷ bitrate.

「音频文件大小计算器」免费吗？需要注册吗？Is the Audio File Size Calculator free? Do I need an account?

「音频文件大小计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Audio File Size Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.