Digital Sound Storage Calculator
WAV to MP3: Calculate the size of files with and without compression.
Audio Resolution: Adjust frequency (kHz) and bits (16/24/32).
Reverse calculation: How much can I record with my remaining space?
Professional Formats: Estimation for FLAC and 192kHz mastering.
# How is the size of an audio recording calculated?
The size of an uncompressed digital audio file (such as WAV or AIFF) depends on three fundamental technical factors: Sample Rate — how many times per second the sound wave is "measured" (e.g. 44.1 kHz or 48 kHz); Bit Depth — the resolution of each measurement, with greater dynamic range and lower noise at higher bits; and Channels — whether the recording is Mono (1), Stereo (2) or Multichannel (Surround). The standard mathematical formula is the Bitrate; multiplied by the duration in seconds, it gives the total raw file size.CD Quality
16-bit / 44.1 kHz. Takes approximately 10.1 MB per minute in stereo. The historic standard of the music industry.
Pro Recording
24-bit / 48 kHz. The standard for video and film. Takes about 16.5 MB per minute. More headroom for mixing.
High Resolution
24-bit / 96 kHz. Used in mastering. Doubles the standard recording size up to 33 MB per minute.
# Why does 24-bit audio take 50% more space than 16-bit?
Each audio sample in 16-bit uses 2 bytes (16 ÷ 8) to store the amplitude. Audio at 24-bit uses 3 bytes per sample. This means that, for the same sample rate, a 24-bit file will be exactly 50% larger than a 16-bit file. If a one-hour recording at 16-bit/44.1kHz takes 635 MB, the same recording at 24-bit/44.1kHz will rise to 953 MB.Is the extra space worth it?
Despite taking more space, 24-bit audio offers a dynamic range of 144 dB versus 96 dB for 16-bit. This provides a much lower "noise floor", allowing weaker signals to be recorded without background noise becoming an issue — vital during professional mixing and mastering.# WAV vs FLAC vs MP3: The impact on disk
WAV / AIFF are uncompressed formats that preserve every bit of the original recording but are the heaviest. FLAC applies lossless compression, reducing the original size by 40-60% without sacrificing quality. MP3 / AAC apply lossy compression, removing imperceptible frequencies; an MP3 at 320 kbps takes approximately 22% of the original WAV.| Quality | Frequency | Bits | MB per Minute (Stereo) |
|---|---|---|---|
| Phone Call | 8 kHz | 8-bit | 0.94 MB |
| FM Radio | 32 kHz | 16-bit | 7.32 MB |
| Original CD | 44.1 kHz | 16-bit | 10.09 MB |
| Video Studio | 48 kHz | 24-bit | 16.48 MB |
| High Fidelity | 96 kHz | 24-bit | 32.96 MB |
# Calculation formula for technicians
If you need to perform the calculation manually or implement it in your own software, this is the logic our calculator follows:const sampleRate = 48000;const bitDepth = 24;const channels = 2;const seconds = 3600;const bitsPerSecond = sampleRate * bitDepth * channels;const totalBytes = (bitsPerSecond * seconds) / 8;
# Use cases for this tool
- Podcasting: Avoid running out of space on your portable recorder during a long interview.
- Music Studio: Calculate how many GB of free space you need before opening a 40-track session at 96kHz.
- Digital Sound Engineering: Verify that the transfer bitrate is compatible with your hardware.
- Film Post-production: Estimate the size of 5.1 multichannel takes for network file delivery.
- Archiving: Determine the capacity needed to digitize a collection of analog tapes at Master quality.