Piano note
C1 Piano Note Frequency
C1 is key 4 of the 88 on a standard piano, with a frequency of 32.70 Hz when the piano is tuned to A4 = 440 Hz.
32.70 Hz
C1 at a glance
- Frequency (A4 = 440 Hz)
- 32.70 Hz
- At A4 = 442 Hz
- 32.85 Hz
- At A4 = 432 Hz
- 32.11 Hz
- Piano key number
- 4 / 88
- MIDI note number
- 24
- Octave
- 1
- Key colour
- White key
- Wavelength in air
- 10.49 m
- Period (one vibration)
- 30.58 ms
- Register
- Low bass
Wavelength assumes sound travels at 343 m/s (air at about 20 °C).
About this part of the keyboard
These are the lowest keys on the piano. On most pianos each of these notes has a single heavy string wound with copper wire; the winding adds mass so the string can sound a very low pitch at a practical length. The fundamental is weak this low, so much of what you hear is the higher partials, and tuners set these notes slightly flat of the theoretical frequency (stretch tuning).
Neighbouring keys
Is your C1 in tune?
Play C1 on your piano and our free online tuner will show how many cents it is from 32.70 Hz.
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