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About A5
A5 has a frequency of 880 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 81 and key number 61 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so A5 is 12 semitones above A4: f = 440 × 2^((81 − 69) / 12) = 880.00 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
A5 frequency in different tunings
| Tuning reference | A5 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 880 Hz |
| A4 = 442 Hz (many European orchestras) | 884 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 886 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 870 Hz |
| A4 = 432 Hz (alternative tuning) | 864 Hz |
| A4 = 415 Hz (Baroque pitch) | 830 Hz |
| C4 = 256 Hz (scientific pitch) | 861.08 Hz |
Where to play A5 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 2nd string (B), fret 22
- 1st string (high E), fret 17
Intervals from A5
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | A♯5 | 932.33 Hz | 16:15 |
| Major second | B5 | 987.77 Hz | 9:8 |
| Minor third | C6 | 1.047 kHz | 6:5 |
| Major third | C♯6 | 1.109 kHz | 5:4 |
| Perfect fourth | D6 | 1.175 kHz | 4:3 |
| Tritone | D♯6 | 1.245 kHz | 45:32 |
| Perfect fifth | E6 | 1.319 kHz | 3:2 |
| Minor sixth | F6 | 1.397 kHz | 8:5 |
| Major sixth | F♯6 | 1.48 kHz | 5:3 |
| Minor seventh | G6 | 1.568 kHz | 9:5 |
| Major seventh | G♯6 | 1.661 kHz | 15:8 |
| Octave | A6 | 1.76 kHz | 2:1 |
Instruments and voices that can play A5
- Piano (88 keys)
- Guitar (standard tuning)
- Violin
- Viola
- Cello
- Harp
- Flute
- Piccolo
- Clarinet (B♭, sounding)
- Oboe
- Trumpet (B♭, sounding)
- Mezzo-soprano voice
- Soprano voice
Frequently asked questions
What is the frequency of A5?
A5 is 880 Hz when A4 = 440 Hz (864 Hz if A4 = 432 Hz).
What MIDI number is A5?
A5 is MIDI note number 81.
Is A5 on a piano?
Yes – it is key 61 of 88.
Where is A5 on the guitar?
In standard tuning: 2nd string (B), fret 22; 1st string (high E), fret 17.