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About D♯8
D♯8 / E♭8 has a frequency of 4.978 kHz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 111, outside the range of a standard piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so D♯8 is 42 semitones above A4: f = 440 × 2^((111 − 69) / 12) = 4,978.03 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
D♯8 and E♭8 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♯8 frequency in different tunings
| Tuning reference | D♯8 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 4.978 kHz |
| A4 = 442 Hz (many European orchestras) | 5.001 kHz |
| A4 = 443 Hz (Berlin, Vienna) | 5.012 kHz |
| A4 = 435 Hz (French diapason normal, 1859) | 4.921 kHz |
| A4 = 432 Hz (alternative tuning) | 4.888 kHz |
| A4 = 415 Hz (Baroque pitch) | 4.695 kHz |
| C4 = 256 Hz (scientific pitch) | 4.871 kHz |
Intervals from D♯8
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | E8 | 5.274 kHz | 16:15 |
| Major second | F8 | 5.588 kHz | 9:8 |
| Minor third | F♯8 | 5.92 kHz | 6:5 |
| Major third | G8 | 6.272 kHz | 5:4 |
| Perfect fourth | G♯8 | 6.645 kHz | 4:3 |
| Tritone | A8 | 7.04 kHz | 45:32 |
| Perfect fifth | A♯8 | 7.459 kHz | 3:2 |
| Minor sixth | B8 | 7.902 kHz | 8:5 |
| Major sixth | C9 | 8.372 kHz | 5:3 |
| Minor seventh | C♯9 | 8.87 kHz | 9:5 |
| Major seventh | D9 | 9.397 kHz | 15:8 |
| Octave | D♯9 | 9.956 kHz | 2:1 |
Frequently asked questions
What is the frequency of D♯8?
D♯8 is 4.978 kHz when A4 = 440 Hz (4.888 kHz if A4 = 432 Hz).
What MIDI number is D♯8?
D♯8 is MIDI note number 111.
Is D♯8 on a piano?
No – a standard 88-key piano runs from A0 to C8, so D♯8 is outside its range.