F♯5 — 739.989 Hz
F♯5 (F-sharp 5) is 739.989 Hz in standard equal temperament at A=440 Hz. It is MIDI note number 78. This is the sharp spelling of this pitch — see also G♭5.
F♯ is the first sharp added to a key signature (G major) and appears in every sharp key. It is the tonic of F♯ major (6 sharps).
F♯5 Frequency in All Tuning Systems
| Temperament | Frequency (Hz) | Cents from Equal | Common Usage |
|---|---|---|---|
| Equal Temperament | 739.989 Hz | 0.00 | Modern standard; piano, fretted instruments |
| Pythagorean Tuning | 742.502 Hz | +5.87 | Medieval/early music; string ensemble open fifths |
| Just / Pure | 735.822 Hz | -9.78 | A cappella vocal, barbershop, Renaissance |
| Meantone 1/3 Comma | 734.160 Hz | -13.69 | Renaissance vocal music in minor keys |
| Meantone 1/4 Comma | 735.616 Hz | -10.26 | Renaissance keyboard, early Baroque organ |
| 1/6 SC - Attenuated | 737.067 Hz | -6.85 | Baroque orchestral ensemble compromise |
| Kellner's Bach | 739.656 Hz | -0.78 | Bach keyboard reconstruction |
| Kirnberger III | 740.408 Hz | +0.98 | Classical-era keyboard, keys near C major |
| Vallotti | 739.989 Hz | 0.00 | Baroque/Classical orchestral tuning |
| Werckmeister III | 739.989 Hz | 0.00 | Baroque keyboard; Bach contemporaries |
| Werckmeister IV | 736.654 Hz | -7.82 | Baroque keyboard, strong key contrast |
| Werckmeister V | 739.989 Hz | 0.00 | Specialized Baroque keyboard |
Positive cents = sharper than equal temperament. Negative cents = flatter. 100 cents = 1 semitone.
F♯5 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) | 739.989 Hz | US, UK, and most modern ensembles worldwide |
| A = 442 Hz | 743.352 Hz | Many European orchestras; France, Germany |
| A = 443 Hz | 745.034 Hz | Berlin Philharmonic; some US orchestras |
| A = 432 Hz | 726.535 Hz | Alternative tuning; Baroque revival |
| A = 415 Hz (Baroque) | 697.944 Hz | Historically-informed Baroque performance |
f = f_at_A440 × (concert_pitch / 440)
Instruments That Play F♯5
F♯5 (739.989 Hz) falls within the comfortable playing range of 37 instruments.
F♯5 and G♭5 — Enharmonic Equivalents
F♯5 and G♭5 are enharmonic equivalents — they sound identical at 739.989 Hz but are written differently depending on the musical context.
When to Write F♯5
F♯ is the first sharp added to a key signature (G major) and appears in every sharp key. It is the tonic of F♯ major (6 sharps).
Composers write F♯ in sharp keys, which includes most string-friendly keys. As the first accidental in the sharp order (F♯, C♯, G♯, D♯, A♯, E♯, B♯), F♯ appears more frequently in Western music than G♭. In ascending passages and sharp-side modulations, F♯ is standard.
Major scales containing F♯5: G major (7th / leading tone), D major (3rd), A major (6th), E major (2nd), B major (5th), F♯ major (tonic).
Minor scales containing F♯5: E minor (2nd), B minor (5th), F♯ minor (tonic), C♯ minor (4th), D minor (3rd, melodic ascending).
F♯5 in Instrument Literature
F♯ is extremely common for string instruments — violinists encounter it in G major (1 sharp), their most natural key after C. Guitarists play F♯ regularly in keys like G, D, and E major. Keyboard players see it as the first sharp in the key-signature order.
In fixed-do solfège, F♯ is sung as "fi" (♯4). In G major with moveable do, it is "ti" (the leading tone).
How G♭5 Differs in Context
While G♭5 sounds identical to F♯5, it belongs to a different set of keys and carries different harmonic implications.
G♭5: G♭ is the tonic of G♭ major (6 flats) and is the enharmonic twin of F♯ major. G♭ major is the only major key with 6 flats.
Major scales: G♭ major (tonic), D♭ major (4th), C♭ major (5th).
Minor scales: E♭ minor (3rd), B♭ minor (6th).
Wind and brass ensembles occasionally encounter G♭ in heavily flatted keys. Harpists may prefer G♭ major over F♯ major because harp pedal notation maps more naturally to flats. Flute players in orchestral literature sometimes see G♭ in modulating passages.
Enharmonic equivalents share the same frequency in equal temperament. In historical temperaments like Pythagorean or meantone, they may differ slightly — see the temperament comparison table above for this note's exact deviations.
Why F♯5 Varies Across Tuning Systems
F♯5 shows a maximum deviation of -13.69 cents in Meantone 1/3 Comma compared to equal temperament. This 14-cent difference reflects how different tuning philosophies prioritize interval purity over equal distribution.
In Meantone 1/3 Comma, F♯5 is tuned flatter than equal temperament, reflecting this system's approach to distributing the Pythagorean comma across the chromatic scale.
2 of the 15 non-equal temperaments deviate by more than 10 cents for F♯5, making this note one where tuning system choice has a meaningful impact on pitch.
F♯5 Across All Tuning Systems
Explore how F♯5 is tuned in each historical temperament system. Each tuning system gives F♯5 a slightly different frequency, affecting the harmonic character of chords and melodies.
F♯5 in Historical Temperament Systems
Explore how F♯5 (739.989 Hz in equal temperament) is tuned in each of the 15 historical non-equal temperament systems. Each system places F♯5 at a slightly different frequency based on its mathematical basis.
Tune F♯5 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.
