Tuning Fork — C128

128.00 Hz

Nearest note: C3, 38 cents below standard tuning

A tuning fork that sounds 128 Hz.

How well is this supported?

MeasuredInstrument

Measured directly, or defined by a published standard.

This entry gives a typical pitch for an instrument. Real instruments vary.

What the four labels meanChecked against sources September 27, 2026

Compare with another tone

The button plays a plain tone. Start with the volume low. Phone and laptop speakers play low notes quietly; headphones or a speaker help.

About this number

A tuning fork that sounds 128 Hz. It is used clinically to test vibration sense, for example when screening for nerve damage. For hearing tests, a 512 Hz fork is preferred. 128 is 2 to the power of 7, which makes it C in scientific pitch. That is about 38 cents below C3 at A = 440 (130.81 Hz). It is sold as the Otto fork.

What is said about it

What is said, not what was measured

Sound healing practitioners place this fork on the body.

Facts

Frequency: 128.00 Hz
Wavelength in air (20 °C): 2.68 m
Nearest note: C3, 38 cents below standard tuning
Kind of statement: Instrument
Filed under: Instruments & gongs

Sources

British Society of Audiology — tuning fork tests
Which tuning forks are used for which clinical test.
British Society of Audiology, Recommended Procedure: Rinne and Weber tuning fork tests (2022).

More about the pitch

The same note in every octave

Each step doubles or halves the frequency. Tap one to hear it.

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.