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About this tool
Calculate uncompressed PCM/WAV file size and bitrate from sample rate, bit depth, channel count and duration.
Audio Bit Depth Size Calculator returns the exact size of an uncompressed linear PCM recording from sample rate × bit depth × channels × duration, divided by eight bits per byte. Because PCM stores every sample frame in the same number of bits, the answer is exact rather than an estimate — unlike lossy or lossless codecs whose size depends on the material. It also reports the bitrate, size per minute and hour, and how long a recording can run before hitting the 4 GiB RIFF ceiling of a classic .wav.
Open Audio Bit Depth Size Calculator on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Linear PCM has a fixed bits-per-frame, so the size is arithmetic rather than a guess.
Adds the 44-byte canonical WAV header and flags when the 4 GiB RIFF limit is exceeded.
Converts free space in GB into usable recording time at your exact format.
Multiply sample rate (Hz) by bit depth (bits) by channel count, then divide by 8 to get bytes per second, and multiply by the duration in seconds. CD audio is 44,100 × 16 × 2 ÷ 8 = 176,400 bytes per second, so one minute is 10,584,000 bytes (about 10.09 MiB).
1,411.2 kbit/s — that is 44,100 samples per second × 16 bits × 2 channels. A 24-bit/96 kHz stereo file is 4,608 kbit/s, roughly 3.3 times larger for the same running time.
The RIFF container stores chunk sizes in unsigned 32-bit fields, capping a file at 4,294,967,295 bytes. At 24-bit/48 kHz stereo that is about 4 hours 8 minutes; longer captures need RF64/BW64 or Sony Wave64, which use 64-bit size fields.
Yes — one third more, because each sample occupies 32 bits instead of 24. The benefit is headroom rather than resolution: 32-bit float recordings can be pulled back from apparent clipping, which is why many field recorders now offer it despite the larger files.
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