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About D♯5
D♯5 / E♭5 has a frequency of 622.25 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 75 and key number 55 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so D♯5 is 6 semitones above A4: f = 440 × 2^((75 − 69) / 12) = 622.25 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
D♯5 and E♭5 are enharmonic: on a piano or in equal temperament they are the same key and the same frequency, but they are spelled differently depending on the key signature.
D♯5 frequency in different tunings
| Tuning reference | D♯5 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 622.25 Hz |
| A4 = 442 Hz (many European orchestras) | 625.08 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 626.5 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 615.18 Hz |
| A4 = 432 Hz (alternative tuning) | 610.94 Hz |
| A4 = 415 Hz (Baroque pitch) | 586.9 Hz |
| C4 = 256 Hz (scientific pitch) | 608.87 Hz |
Where to play D♯5 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 3rd string (G), fret 20
- 2nd string (B), fret 16
- 1st string (high E), fret 11
Intervals from D♯5
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | E5 | 659.26 Hz | 16:15 |
| Major second | F5 | 698.46 Hz | 9:8 |
| Minor third | F♯5 | 739.99 Hz | 6:5 |
| Major third | G5 | 783.99 Hz | 5:4 |
| Perfect fourth | G♯5 | 830.61 Hz | 4:3 |
| Tritone | A5 | 880 Hz | 45:32 |
| Perfect fifth | A♯5 | 932.33 Hz | 3:2 |
| Minor sixth | B5 | 987.77 Hz | 8:5 |
| Major sixth | C6 | 1.047 kHz | 5:3 |
| Minor seventh | C♯6 | 1.109 kHz | 9:5 |
| Major seventh | D6 | 1.175 kHz | 15:8 |
| Octave | D♯6 | 1.245 kHz | 2:1 |
Instruments and voices that can play D♯5
Frequently asked questions
What is the frequency of D♯5?
D♯5 is 622.25 Hz when A4 = 440 Hz (610.94 Hz if A4 = 432 Hz).
What MIDI number is D♯5?
D♯5 is MIDI note number 75.
Is D♯5 on a piano?
Yes – it is key 55 of 88.
Where is D♯5 on the guitar?
In standard tuning: 3rd string (G), fret 20; 2nd string (B), fret 16; 1st string (high E), fret 11.