F#5
739.99 Hz
The note F♯5 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.
How well is this supported?
Measured directly, or defined by a published standard.
This is a note in standard tuning. Its value is set by definition, not measured.
The button plays a plain tone. Start with the volume low.
About this number
Musical note F# in octave 5. Mid to treble range.
Facts
- Frequency
- 739.99 Hz
- Wavelength in air (20 °C)
- 46.4 cm
- Kind of statement
- Musical standard
- Filed under
- Musical notes
Sources
- Twelve-tone equal temperament, A4 = 440 Hz
Each note is the one below it multiplied by the twelfth root of two. A4 is fixed at 440 Hz by ISO 16.
ISO 16:1975, Acoustics — Standard tuning frequency (Standard musical pitch).
More about the pitch
The same note in every octave
Each step doubles or halves the frequency. Tap one to hear it.
Whole-number multiples
Two, three, four times the frequency, and so on. A string or a flute sounds overtones at these values. A gong does not follow this pattern.
Entries close in pitch
Within 35 cents of this tone, in any octave. A cent is one hundredth of the step between two neighboring piano keys. Being close in pitch does not mean two things are connected.