The short answer
528 Hz is a single acoustic frequency, whereas musical tuning is a system that defines the relationships between many notes. In standard A4 = 440 equal temperament, C5 is about 523.25 Hz, so 528 Hz is near C5 but is not standard C5. A claim that “528 Hz equals C” therefore requires a stated alternative tuning convention.
Musical convention
One frequency is not a tuning system
528 Hz is one frequency, not a complete musical tuning system.
The actual separation
Musical convention
Under ISO standard pitch, C5 is approximately 523.25 Hz. 528 Hz sits about 4.75 Hz above it — roughly 15.6 cents sharp, which is a small but entirely audible difference to a trained ear and easily visible on any tuner.
Where the equivalence comes from
“528 Hz = C” holds only under a tuning convention in which C is defined at 528 Hz, which is not standard pitch. Stated that way it is a coherent, if non-standard, choice. Stated as a bare fact it is incorrect, because it silently swaps the reference without telling the reader.
Claims that go further
Evidence limited
528 Hz is frequently attached to claims about cellular or genetic repair. Those claims are not supported by the acoustics or clinical literature, and ANURAVA does not make them. Reviews of singing-bowl research describe a small and heterogeneous evidence base that does not establish a specific healing frequency of any value.
If you want a bowl near 528 Hz
That is a perfectly reasonable preference, and it can be satisfied honestly: measure the instrument, publish the frequency, and state the reference used to name the note. What should not happen is a bowl being labelled 528 Hz because it is approximately C, or being sold on an implied biological effect.
Frequently asked
Is 528 Hz a C note?
Not under standard pitch. At A4 = 440 Hz, C5 is approximately 523.25 Hz, so 528 Hz is about 15.6 cents sharp of C5 — close to C5 but not equal to it.
What musical note is 528 Hz?
It is nearest to C5 in standard A4 = 440 Hz equal temperament, sharp by roughly 15.6 cents. Naming it exactly C requires a different, non-standard tuning convention.
Is 528 Hz a tuning system or one frequency?
One frequency. A tuning system defines the relationships between all the notes; 528 Hz specifies a single point.
Sources & methodology
- StandardISO 16: Acoustics — Standard tuning frequency (Standard musical pitch)International Organization for StandardizationSpecifies A in the treble stave at 440 Hz; confirmed current in 2022.
- Systematic reviewSystematic review of singing-bowl clinical studies (2025)Peer-reviewed systematic reviewIdentified nineteen clinical studies including nine RCTs, with varied populations, interventions and study characteristics.
Written and reviewed by ANURAVA. Where a statement rests on a musical convention or a traditional association rather than on measurement, it is labelled as such in the text above.