Sound & Acoustics Silo20 Hz – 20,000 Hz12-TET Tuning
Sound Lab
Acoustic wave engines grounded in ISO 16:1975 standard pitch (A4 = 440 Hz), 12-tone equal temperament logarithms, thermodynamic speed of sound in air, and audio production delay math.
88 Notes
Note to Frequency
Explore all 88 piano keys (A0 to C8) with interactive visual keyboard, Web Audio synthesis, acoustic wavelength, and cents deviation.
Audio Timing
BPM to Milliseconds
Calculate exact tempo delay times (1/1 to 1/64, triplet, dotted) and LFO modulation Hz for studio reverbs, compressors, and synthesizers.
NASA Glenn
Speed of Sound in Air
Determine thermodynamic acoustic velocity (v = 331.3 · √(1 + T/273.15)) and wavelength λ = v/f across environmental temperatures.
Acoustic & Musical Reference Pitches
ISO 16:1975 Equal TemperamentA0Key #1
Sub-Audible Limit
Lowest piano key
27.5 Hzλ = 1248.0 cm
E1Key #8
Low E (Bass Guitar)
Standard 4-string bass low
41.2 Hzλ = 833.0 cm
C2Key #16
Cello C-String
Low orchestral register
65.41 Hzλ = 524.7 cm
A2Key #25
Guitar A-String
Standard guitar 5th string
110 Hzλ = 312.0 cm
C4Key #40
Middle C
Central keyboard reference
261.63 Hzλ = 131.2 cm
A4Key #49
Concert Pitch A440
ISO 16:1975 Tuning Standard
440 Hzλ = 78.0 cm
C6Key #64
High C (Soprano)
Operatic high ceiling
1046.5 Hzλ = 32.8 cm
C8Key #88
Highest Piano Key
Acoustic brilliance peak
4186.01 Hzλ = 8.2 cm
Complete 88-Key Piano Pitch Catalog (A0 – C8)
Quickly select any of the 88 standard equal-tempered musical pitches: