Audio File Size
Calculate uncompressed audio file size from bit depth, sample rate, duration, and number of channels. Get results in KB, MB, and GB with interactive charts.
About This Calculator
The Audio File Size Calculator estimates the uncompressed file size of digital audio recordings based on four key parameters: bit depth, sample rate, duration, and number of audio channels. This tool is essential for audio engineers, musicians, podcasters, video editors, and anyone planning storage or bandwidth for audio projects.
Digital audio represents sound by taking periodic samples of the analog waveform. Each sample stores the amplitude value at a specific point in time. The file size depends on how many bits are used per sample (bit depth), how many samples are taken per second (sample rate), how many audio channels are recorded (mono, stereo, surround), and the total duration of the recording. The formula is: file size (bytes) = (bit depth x sample rate x channels x duration in seconds) / 8. This gives the uncompressed raw audio data size before any file format container overhead.
Regional Notes
India: Mobile data plans in India are among the most affordable globally, making streaming compressed audio (96-160 kbps) common. FM radio and local music streaming services like Gaana and JioSaavn typically use AAC or MP3 at 128-320 kbps. Uncompressed audio is primarily used in professional recording studios and film post-production.
United States: CD-quality audio (16-bit, 44.1 kHz, stereo) remains a benchmark for music enthusiasts. Streaming services like Spotify use Ogg Vorbis at 96-320 kbps, while Tidal offers lossless FLAC at CD quality. Podcasts typically use mono MP3 at 64-128 kbps for efficient downloads.
United Kingdom: BBC Sounds streams at 128-320 kbps AAC. UK radio stations use 48 kHz sample rate for DAB digital broadcasts. The British audio industry, including Abbey Road Studios and BBC's audio archives, continues to set standards in professional audio production.
Frequently Asked Questions
How is uncompressed audio file size calculated?
Uncompressed audio file size is calculated by multiplying bit depth, sample rate, number of channels, and duration in seconds, then dividing by 8 to convert bits to bytes. For example, a 3-minute CD-quality audio (16-bit, 44100 Hz, stereo) is approximately 30.3 MB.
What is the difference between compressed and uncompressed audio?
Uncompressed audio (WAV, AIFF) stores every sample exactly as recorded, resulting in large files. Compressed audio (MP3, AAC) removes inaudible frequencies using psychoacoustic models to reduce file size by 50-90% while maintaining perceived quality for most listeners.
How does bit depth affect audio file size?
Bit depth determines the dynamic range of each sample. Higher bit depth (24-bit or 32-bit) means more amplitude levels per sample, which increases file size compared to 16-bit at the same sample rate. Audio CDs use 16-bit, while studio recordings often use 24-bit for greater headroom during mixing.
What sample rate should I use for my audio project?
44.1 kHz is the standard for music CDs and most streaming platforms. 48 kHz is standard for video and film production. Higher rates like 96 kHz or 192 kHz are used in professional studio recording but produce significantly larger files with diminishing audible returns for most consumers.
How do stereo and surround sound affect file size?
Each channel adds its own waveform data. Stereo (2 channels) doubles the file size of mono. Surround formats multiply further: 5.1 surround requires 6 channels, and 7.1 surround requires 8 channels, proportionally increasing the file size.
What is the typical file size of a 3-minute CD-quality song?
A 3-minute CD-quality song (44.1 kHz, 16-bit, stereo) as an uncompressed WAV file is approximately 30.3 MB. The same song encoded as MP3 at 320 kbps would be about 7.2 MB, and at 128 kbps about 2.9 MB.
How can I estimate file size for my audio recording?
Use the formula: file size (bytes) = bit depth x sample rate x channels x duration (seconds) / 8. For quick estimation, a 16-bit 44.1 kHz stereo recording uses about 10.1 MB per minute, while a 24-bit 48 kHz stereo recording uses about 17.3 MB per minute.