Creator media glossary
What is audio sample rate?
Short answer
How many times per second audio is measured when it is recorded digitally, in kilohertz: 44.1 kHz for music and CDs, 48 kHz for video.
Key takeaways
- Sample rate is how many times per second audio is measured, in kHz.
- 44.1 kHz is the music and CD standard; 48 kHz is the standard for video.
- A sample rate captures frequencies up to half its value, so both cover human hearing.
- Record and edit video audio at 48 kHz to avoid drift and conversions.
Audio sample rate explained
A sample rate of 48 kHz means the sound wave is measured 48,000 times a second. The highest frequency a file can hold is half its sample rate, so 44.1 and 48 kHz both cover the roughly 20 kHz limit of human hearing; higher rates such as 96 kHz are mainly used in recording and production.
Video works at 48 kHz: YouTube recommends it and the Instagram API accepts up to 48 kHz. Problems start when a project mixes rates, such as a 44.1 kHz music track in a 48 kHz edit, so set the project and recorder to 48 kHz and let the editor convert anything else once.
How sampling works and the Nyquist limit
A microphone produces a continuous wave. Recording it digitally means measuring its level at regular instants; each measurement is a sample. The Nyquist-Shannon theorem says a sample rate captures frequencies up to half its value, so 44.1 kHz records up to 22.05 kHz and 48 kHz up to 24 kHz, both above the roughly 20 kHz limit of human hearing.
Anything above that limit must be filtered out before sampling, or it folds back into the audible range as false tones, called aliasing. Higher sample rates leave more room for gentle filters, which is one practical reason studios record at 96 kHz.
Why 44.1 kHz and 48 kHz
- 44.1 kHz comes from early digital audio stored on video tape: three samples on each of 245 usable lines per field at 60 fields a second (NTSC), or 294 lines at 50 (PAL), both make 44,100. The CD adopted it in 1982.
- 48 kHz became the professional and broadcast rate, used by DAT, digital video and film, and divides more neatly into video frame rates.
- 96 and 192 kHz are high-resolution rates for recording, sound design and slowing audio down without artifacts.
Common sample rates
| Rate | Highest frequency | Used for |
|---|---|---|
| 8 kHz | 4 kHz | Telephone calls |
| 16 kHz | 8 kHz | Speech recognition, wideband calls |
| 44.1 kHz | 22.05 kHz | CD, most music streaming and downloads |
| 48 kHz | 24 kHz | Video, film, broadcast, YouTube and Instagram uploads |
| 96 kHz | 48 kHz | Recording and mastering, hi-res releases |
| 192 kHz | 96 kHz | Specialist recording and archiving |
Sample rates platforms ask for
| Platform | Sample rate | Notes |
|---|---|---|
| YouTube | 48 kHz | Recommended upload encoding setting |
| Instagram (API) | Up to 48 kHz | AAC, mono or stereo |
| Apple Podcasts (MP3) | 44.1 kHz (48 kHz for some bitrates) | WAV and FLAC masters: 44.1 kHz at 16 or 24 bit, or higher rates at 24 bit |
Sample rate and file size
| Format | Per minute, stereo WAV |
|---|---|
| 44.1 kHz, 16-bit | About 10.6 MB |
| 48 kHz, 16-bit | About 11.5 MB |
| 48 kHz, 24-bit | About 17.3 MB |
| 96 kHz, 24-bit | About 34.6 MB |
| 192 kHz, 24-bit | About 69.1 MB |
Size = sample rate × bit depth × channels × 60 ÷ 8. Compressed formats such as AAC or MP3 are a small fraction of this.
Sample rate vs bit depth
Sample rate is how often the wave is measured; bit depth is how finely each measurement is stored. Each extra bit adds about 6 dB of dynamic range: 16-bit gives about 96 dB, enough for any finished music, and 24-bit about 144 dB, which gives headroom when recording. 32-bit float recorders and interfaces go further, so a take that peaks too loud can usually be recovered by lowering it afterwards.
| Format | Sample rate | Bit depth | Uncompressed stereo bitrate |
|---|---|---|---|
| CD audio | 44.1 kHz | 16-bit | 1,411 kbps |
| Video production standard | 48 kHz | 24-bit | 2,304 kbps |
| Hi-res recording | 96 kHz | 24-bit | 4,608 kbps |
Free tool:Uncompressed audio size calculator
Sample rate problems and fixes
- Audio drifts out of sync over a long video: a 44.1 kHz track was treated as 48 kHz or the other way round. Convert to 48 kHz before editing.
- Audio plays fast and high-pitched (or slow and low): a file played at the wrong rate; 48 kHz played as 44.1 kHz is about 8% slow and lower in pitch.
- Crackles in a recording: the interface and the app are set to different rates; match them in the audio settings.
- To convert: in Audacity, set the project rate and export; with FFmpeg,
ffmpeg -i in.wav -ar 48000 out.wav. - To check a file's rate: Windows File Explorer > Properties > Details, Mac Finder > Get Info, or our file inspector.
Free tools:File inspectorAudio checker
Frequently asked questions
What is audio sample rate?
The number of measurements per second taken of a sound wave when it is recorded digitally, in kilohertz. 48 kHz means 48,000 samples a second.
Should I use 44.1 kHz or 48 kHz?
Use 48 kHz for anything that ends up in a video: YouTube recommends it and the Instagram API accepts up to 48 kHz. 44.1 kHz is the music and CD standard and is fine for audio-only releases.
Is a higher sample rate better?
Not for listening. The highest frequency a file can hold is half its sample rate, so 44.1 and 48 kHz already cover human hearing; higher rates are mainly a production choice.
What is the difference between sample rate, bit depth and bitrate?
Sample rate is how often the sound is measured, bit depth is how precisely each measurement is stored (16 or 24 bit), and bitrate is how much data per second the encoded file uses after compression.
Does converting 44.1 kHz to 48 kHz lose quality?
A good resampler makes the change inaudible. What matters is doing it once, before editing, rather than letting each app convert on the fly.
Is 96 kHz better for YouTube?
No. YouTube recommends 48 kHz and delivers audio at 48 kHz or lower, so higher rates only make the upload bigger.
Let Koldflux pick the settings
Koldflux chooses the codec, container and bitrate for each platform when it exports.
Free tools that use this
Sources and how we checked
- YouTube Help: Recommended upload encoding settings (checked 2026-10-05)
- Instagram API: IG User Media (reel, story and video specifications) (checked 2026-10-05)
- Apple Podcasts for Creators: Audio requirements (checked 2026-10-05)
Reviewed October 5, 2026 by the Koldflux team. Definitions follow the specifications and platform documentation linked above; platform tables come from the same registry the Koldflux tools use.