Audio

Bit Depth Calculator

Compare dynamic range and file size at 8, 16, 24, and 32-bit. See exactly what each bit depth gives you in real-world audio.

Quick Answer

Dynamic range ≈ 6 dB per bit. 16-bit = 96 dB (CD), 24-bit = 144 dB (recording standard), 32-bit float = effectively unlimited (1500+ dB). Each step up adds 50% to file size.

File Size by Bit Depth

Duration (seconds)

3.0 minutes

Sample Rate (Hz)

Channels

16-bit

32.96 MB

24-bit

49.44 MB

32-bit (int/float)

65.92 MB

Dynamic Range by Bit Depth

Bit DepthDynamic RangeValuesCommon Use
8-bit48 dB256Vintage games, low-quality voice
12-bit72 dB4,096Early sampler memories (Akai S950)
16-bit96 dB65,536CD audio, MP3, streaming delivery
20-bit120 dB1,048,576Legacy DAT, video formats
24-bit144 dB16,777,216Recording, mixing, mastering standard
32-bit192 dB4,294,967,29632-bit integer (rarely used today)
32-bit float1500 dB—32-bit float — modern recording, no clipping
64-bit floatEffectively ∞—64-bit float — internal mix bus precision

About This Tool

The Bit Depth Calculator shows the practical impact of choosing 8-bit, 16-bit, 24-bit, or 32-bit float audio: dynamic range, number of representable amplitude values, and file size for any duration, sample rate, and channel count. This information drives session setup, archival decisions, and delivery format choices.

What Bit Depth Means

Bit depth is the number of bits used to encode each audio sample. Each sample is a snapshot of the waveform's amplitude at one instant. With 16 bits per sample, the amplitude can take any of 65,536 values; with 24 bits, 16,777,216 values; with 32 bits, over 4 billion. More bits means finer amplitude resolution, which translates to a lower noise floor (less quantization noise) and greater dynamic range.

The 6 dB Per Bit Rule

Each bit added to the resolution doubles the number of values, which translates to about 6.02 dB of additional theoretical dynamic range. The formula is: dynamic range ≈ 6.02 × bit_depth + 1.76 dB. This produces 96 dB for 16-bit, 144 dB for 24-bit, 192 dB for 32-bit integer. For comparison, the loudest sound humans can tolerate is about 120 dB SPL, the threshold of hearing is 0 dB SPL, and a quiet bedroom is around 30 dB SPL. 24-bit gives you 144 dB to work with — far more than any acoustic environment requires.

Recording at 24-bit

The case for 24-bit recording is overwhelming. Recording at 16-bit forces you to peak close to 0 dBFS to use the available bit depth, leaving no margin for transients. Peaking at −12 dBFS in 16-bit effectively uses only 14 bits — wasting capacity. At 24-bit, you can peak at −18 dBFS comfortably and still have 22 useful bits, with nearly 130 dB of usable dynamic range. The cost is just 50% more storage versus 16-bit.

32-bit Float Recording

32-bit floating-point recording (used by recent Sound Devices, Zoom, and other field recorders) effectively eliminates clipping. The format encodes both an exponent and a mantissa, giving theoretical dynamic range over 1500 dB. If your recording overloads the input, you can simply lower the gain in post and recover a clean signal. The trade-off is double the storage of 24-bit and slightly heavier processing. For unpredictable field recording situations, it's a game-changer.

Dithering When Reducing Bit Depth

When converting from 24-bit (your mix) to 16-bit (CD/streaming delivery), apply dithering. Dithering adds carefully shaped low-level noise that masks the truncation artifacts and preserves perceived detail below the 16-bit noise floor. Most mastering plugins (Ozone, Pro-L 2, Limiter No 6) include dithering options. Use TPDF (triangular probability density function) dither at the standard level. Skip dithering and you get audible truncation distortion, especially in fade-outs.

Pair With Other Tools

Use our Sample Rate Converter for sample rate planning, the Audio File Size Calculator for compressed format estimates, the Audio Bandwidth Calculator for streaming infrastructure, the Streaming Audio Quality Calculator to compare bitrates, the LUFS Calculator for streaming targets, or the Compression Ratio Calculator for dynamics work.

Frequently Asked Questions

What is bit depth?
Bit depth is the number of bits used to represent each audio sample. 16 bits gives 65,536 possible amplitude values per sample. 24 bits gives 16.7 million. The more bits, the finer the amplitude resolution — and the lower the noise floor (quantization noise) of the digital signal. Bit depth is independent of sample rate, which is how often samples are taken.
How does bit depth relate to dynamic range?
Each bit doubles the resolution, which adds about 6 dB of dynamic range. The formula is dynamic range ≈ 6.02 × bit_depth + 1.76 dB. So 16-bit gives ~96 dB, 24-bit gives ~144 dB, 32-bit integer gives ~192 dB. Real-world music covers maybe 60-80 dB; symphonic music and natural sounds can exceed 100 dB. 24-bit gives plenty of headroom for tracking and mixing without quantization noise concerns.
Should I record at 16-bit or 24-bit?
24-bit. The extra 48 dB of dynamic range lets you set conservative input levels (peak at -18 to -12 dBFS) without worrying about losing resolution. At 16-bit you'd need to track close to 0 dBFS to use the full bit depth, risking clipping on transients. 24-bit costs only 50% more storage than 16-bit but eliminates a major source of noise. There's no good reason to record at 16-bit on modern equipment.
What's 32-bit float and why use it?
32-bit floating-point uses 8 bits for an exponent and 24 bits for the mantissa, giving theoretical dynamic range of around 1500 dB. It can't clip in any practical sense — even if you record at +30 dBFS, you can pull it back down without distortion. Modern field recorders (Zoom F2, F3, F8 Pro, Sound Devices MixPre) use 32-bit float for safety in unpredictable recording situations. Most DAWs also use 32-bit (or 64-bit) float internally for mix bus calculations.
Should I deliver final masters at 16-bit or 24-bit?
It depends on the format. CDs require 16-bit/44.1 kHz. Streaming services like Spotify and Apple Music accept 24-bit but transcode to lossy formats anyway. Hi-res download stores (Bandcamp, Qobuz) prefer 24-bit. Always export from your 24-bit mix using proper dithering when going down to 16-bit — dithering adds carefully shaped noise that masks the truncation artifacts and preserves perceived dynamic range below the 16-bit floor.

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