Sample Rate Explained: 44.1 vs 48 vs 96 kHz

Sample rate is how many times per second a digital recording measures the sound wave. It is the number behind labels like 44.1 kHz and 48 kHz, and it decides the highest pitch a file can hold. This guide explains what the number means, why the two common rates exist, whether a higher rate sounds better, and which one to pick for music, video and podcasts.

What sample rate means

Digital audio stores sound as a long series of snapshots. Each snapshot, or sample, records how far the sound wave has moved at one instant. The sample rate is how many of those snapshots are taken every second.

A rate of 44.1 kHz means 44,100 samples per second. At 48 kHz it is 48,000, and at 96 kHz it is 96,000. More samples per second let the file describe faster changes in the wave, which is how it captures higher pitches.

Why 44.1 kHz covers everything you can hear

The rule that governs all digital audio is simple: to record a frequency, you need more than twice as many samples per second as that frequency. Half the sample rate is the ceiling, called the Nyquist frequency.

Human hearing reaches about 20 kHz at best, and less with age. A 44.1 kHz file has a ceiling of 22.05 kHz, just above that limit. The small gap between 20 kHz and 22.05 kHz is deliberate: it gives the filter that removes out-of-range sound somewhere to work, so it does not cut into what you can hear.

Where the odd number 44,100 came from

The figure is a leftover from how digital audio was first stored. In the late 1970s, hard drives were too small and too expensive for digital recordings, so engineers used PCM adaptors that disguised audio as a video signal and recorded it onto ordinary video tape. The sample rate had to fit the tape's picture structure: on the European system, 294 usable lines per field, 50 fields per second and 3 samples per line gives exactly 44,100 samples per second. The compact disc standard adopted that rate in 1980, and music has used it ever since.

44.1 kHz vs 48 kHz

For listening, there is no audible difference. Both rates capture the full range of human hearing, so a well-made song sounds the same at either. The real difference is which world a file belongs to:

• 44.1 kHz is the music standard. It is the CD rate, and most music is still produced and distributed at it.
• 48 kHz is the video standard. Film, television and online video use it, and YouTube's recommended upload settings list 48 kHz audio. It also divides cleanly by common frame rates: 2,000 samples per frame at 24 fps and 1,920 at 25 fps.

So the practical rule is: make music at 44.1 kHz, and make anything that will sit under video at 48 kHz. The mistake to avoid is mixing the two inside one project, which forces a conversion and, in some older editors, playback at the wrong speed.

Should you record at 48 kHz or 96 kHz?

For most recording, 48 kHz is enough. Recording at 96 kHz makes sense when you plan heavy processing: large pitch shifts, extreme time-stretching, or effects that create high-frequency content, which some engineers find cleaner at a higher rate. The cost is storage. A 96 kHz file is about 118% larger than a 44.1 kHz file, so a session doubles in size and more.

Whatever you record at, you normally deliver at 44.1 kHz for music or 48 kHz for video. Recording high and delivering at a standard rate is common; delivering at 96 kHz to listeners who cannot hear above 20 kHz only makes the files bigger.

Sample rate vs bit depth vs bitrate

These three numbers are easy to confuse, and they describe different things.

• Sample rate is how often the wave is measured, in samples per second.
• Bit depth is how precisely each measurement is stored. CD audio uses 16 bits; recording usually uses 24 bits for more headroom.
• Bitrate is how much data the file uses per second. For uncompressed audio it follows from the other two: 44,100 samples × 16 bits × 2 channels gives 1,411 kbps, the CD bitrate. For a compressed format such as MP3, the bitrate is set by the encoder instead, for example 320 kbps.

A higher sample rate raises the highest pitch the file can hold. A higher bit depth lowers the noise floor. Neither changes how good a recording sounds if the original was already better than the file.

What is CD quality?

CD quality means 16-bit samples at 44.1 kHz, in stereo. That works out to 1,411 kbps of uncompressed audio, and it is the benchmark most other formats are measured against. A WAV file at 44.1 kHz and 16 bits holds exactly this, and so does a lossless FLAC or Apple Lossless file ripped from a CD. Apple Music's Lossless tier, for example, starts at this level and goes up from there. Lossy formats such as MP3 and AAC are made from CD-quality audio but keep only part of it, which is why their bitrates are far lower.

How to check a file's sample rate

The quickest way on any computer is to open the file in VLC and choose Tools > Codec Information: the audio stream lists its sample rate. Audio editors show it too, usually next to the track. It is worth checking before you convert or combine files, because two clips at different rates in one project is the most common cause of the timing and speed problems described above.

Common sample rates

Sample rate and file size

For uncompressed audio, file size grows in step with the sample rate. Compared with 44.1 kHz, a 48 kHz WAV file is about 9% larger, a 96 kHz file about 118% larger, and a 192 kHz file about 335% larger.

When size matters, convert WAV to MP3 for sharing; MP3 files normally use 44.1 kHz. To archive a high-rate recording without losing anything, convert WAV to FLAC, which shrinks the file while keeping every sample.

Converting between sample rates

Changing the rate means resampling: the software calculates new samples in between the old ones. Modern resamplers do this very cleanly, but it is still a change to the audio, so avoid doing it more than once. Pick one rate for a project, record and edit at it, and convert only at the end if the destination needs something else.

Changing a file's format does not have to change its rate. When you convert MP3 to WAV, the WAV keeps the rate the MP3 already had, which is what you want.

What sample rate should you use?

• Music for listening or streaming: 44.1 kHz.
• Anything with video, including YouTube: 48 kHz.
• Recording music: 44.1 or 48 kHz; 96 kHz only if your workflow benefits and you have the storage.
• Podcasts and voice: 44.1 or 48 kHz. Match whatever your editor or video platform expects.

For a deeper look at the numbers behind CD quality, see our guide to sample rate.