D4 — 293.665 Hz
D4 (D4) is 293.665 Hz in standard equal temperament at A=440 Hz. It is MIDI note number 62.
D4 Frequency in All Tuning Systems
| Temperament | Frequency (Hz) | Cents from Equal | Common Usage |
|---|---|---|---|
| Equal Temperament | 293.665 Hz | 0.00 | Modern standard; piano, fretted instruments |
| Pythagorean | 293.332 Hz | -1.96 | Medieval/early music; string ensemble open fifths |
| Just Intonation (Major) | 294.329 Hz | +3.91 | A cappella vocal, barbershop, Renaissance |
| Just Intonation (Minor) | 294.329 Hz | +3.91 | Minor-key vocal music, string ensembles |
| Quarter-Comma Meantone | 294.245 Hz | +3.42 | Renaissance keyboard, early Baroque organ |
| Third-Comma Meantone | 294.550 Hz | +5.21 | Renaissance vocal music in minor keys |
| Sixth-Comma Meantone | 293.997 Hz | +1.96 | Baroque orchestral ensemble compromise |
| Werckmeister III | 294.329 Hz | +3.91 | Baroque keyboard; Bach contemporaries |
| Werckmeister IV | 294.329 Hz | +3.91 | Baroque keyboard, strong key contrast |
| Werckmeister V | 294.994 Hz | +7.82 | Specialized Baroque keyboard |
| Kirnberger III | 294.245 Hz | +3.42 | Classical-era keyboard, keys near C major |
| Vallotti | 293.997 Hz | +1.96 | Baroque/Classical orchestral tuning |
| Young (1799) | 293.997 Hz | +1.96 | Classical-era keyboard |
| Bach/Lehman | 293.997 Hz | +1.96 | Bach keyboard works, Well-Tempered Clavier |
| Neidhardt | 293.997 Hz | +1.96 | 18th century keyboard, near-equal alternative |
| Kellner (Bach) | 294.196 Hz | +3.13 | Bach keyboard reconstruction |
Positive cents = sharper than equal temperament. Negative cents = flatter. 100 cents = 1 semitone.
D4 at Different Concert Pitches
The same note varies in frequency depending on the concert pitch standard used by your ensemble.
| Concert Pitch | Frequency (Hz) | Common Usage |
|---|---|---|
| A = 440 Hz (ISO standard) | 293.665 Hz | US, UK, and most modern ensembles worldwide |
| A = 442 Hz | 295.000 Hz | Many European orchestras; France, Germany |
| A = 443 Hz | 295.667 Hz | Berlin Philharmonic; some US orchestras |
| A = 432 Hz | 288.325 Hz | Alternative tuning; Baroque revival |
| A = 415 Hz (Baroque) | 276.979 Hz | Historically-informed Baroque performance |
f = f_at_A440 × (concert_pitch / 440)
Instruments That Play D4
D4 (293.665 Hz) falls within the comfortable playing range of 53 instruments.
D4 Across All Tuning Systems
Explore how D4 is tuned in each historical temperament system. Each tuning system gives D4 a slightly different frequency, affecting the harmonic character of chords and melodies.
Tune D4 with precision — Get Tunable.
Tunable supports 15+ tuning systems including equal temperament, Pythagorean, just intonation, and historical well-temperaments. See exact Hz values in real-time as you play.