440 Hz
Play it, then see what note it is closest to
A4, the tuning reference this whole site uses. Concert pitch is 440 Hz unless you deliberately retune A4 in the note calculator.
The nearest equal-tempered pitch is A4 at 440.00 Hz, 0 cents below this tone — this tone is that note exactly. The full generator, with sweeps and noise, is the tone generator. This page is the canonical reference for 440 Hz.
Nearby published frequencies
Find this band inside real music.
Frequency training in the app hides a boost in a loop and asks you to name it, which is harder than a naked sine wave.
Download on theApp Store- EQ & compressionDaily drills on drums, bass, guitars and full mixes.
- Intervals & chordsPiano training that uses the same note names as these pages.
- Studio toolsMetronome, tone generator and tap tempo live in the app too.
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FAQ
440 Hz questions
What note is 440 Hz?
A4, 0 cents exactly, when A4 is 440 Hz.
Why publish 440 Hz and not 441 Hz?
Because this one sits on a band engineers solo, a tuning reference, or a hearing check. The tone generator already plays every frequency in between.
How loud should I listen?
Keep a 440 Hz tone at a conversation level. These pages can generate steady tones and noise, which fatigue your ears faster than music. If anything rings or feels uncomfortable, stop and turn the volume down.