A4
Frequency, piano key and harmonics
A4 is the tuning reference: 440 Hz when this site's default is in force. Orchestras, tuners and every other note page start from this pitch.
| Harmonic | Frequency | Nearest equal-tempered note |
|---|---|---|
| 1 · fundamental | 440.00 Hz | A4 (+0 ¢) |
| 2× | 880.00 Hz | A5 (+0 ¢) |
| 3× | 1320.00 Hz | E6 (+2 ¢) |
| 4× | 1760.00 Hz | A6 (+0 ¢) |
| 5× | 2200.00 Hz | C♯7 (−14 ¢) |
| 6× | 2640.00 Hz | E7 (+2 ¢) |
Piano playback uses a recorded piano sample. The sine button is the exact equal-tempered frequency. Neighbors: G♯4 and A♯4. Arbitrary pitches and alternate A4 tunings belong on the calculator.
Hear the note. Then name the interval.
Interval and chord drills in the app are built on this same piano and this same tuning.
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
A4 questions
What frequency is A4?
440.00 Hz when A4 is 440 Hz. Change the reference on the note calculator if you need another tuning. This page does not change.
What MIDI note is A4?
MIDI 69. Piano key 49, counting A0 as key 1 and C8 as key 88.
How loud should I listen?
Keep the 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.