Listen to 113 frequencies

From 20 Hz to 24 kHz — pick a frequency and hear it right away, with its wavelength, period and nearest musical note worked out for you.

Turn the volume down before you play. A pure tone is harder on the ears than music at the same level.

Infrasound (below 20 Hz)13

1 HzC-4 · 343 m 2 HzC-3 · 171.5 m 3 HzG-3 · 114.33 m 5 HzD#-2 · 68.6 m 6 HzG-2 · 57.17 m 7.83 HzB-2 · 43.81 m 8 HzC-1 · 42.88 m 10 HzD#-1 · 34.3 m 12.5 HzG-1 · 27.44 m 14 HzA-1 · 24.5 m 15 HzB-1 · 22.87 m 16 HzC0 · 21.44 m 18 HzD0 · 19.06 m

Bass (20–250 Hz)51

20 HzD#0 · 17.15 m 25 HzG0 · 13.72 m 27.5 HzA0 · 12.47 m 30 HzB0 · 11.43 m 31.5 HzB0 · 10.89 m 32.7 HzC1 · 10.49 m 35 HzC#1 · 9.8 m 40 HzD#1 · 8.57 m 41.2 HzE1 · 8.33 m 45 HzF#1 · 7.62 m 49 HzG1 · 7 m 50 HzG1 · 6.86 m 55 HzA1 · 6.24 m 60 HzB1 · 5.72 m 61.74 HzB1 · 5.56 m 63 HzB1 · 5.44 m 65.41 HzC2 · 5.24 m 70 HzC#2 · 4.9 m 73.42 HzD2 · 4.67 m 80 HzD#2 · 4.29 m 82.41 HzE2 · 4.16 m 87.31 HzF2 · 3.93 m 90 HzF#2 · 3.81 m 92.5 HzF#2 · 3.71 m 98 HzG2 · 3.5 m 100 HzG2 · 3.43 m 103.83 HzG#2 · 3.3 m 110 HzA2 · 3.12 m 116.54 HzA#2 · 2.94 m 120 HzB2 · 2.86 m 123.47 HzB2 · 2.78 m 125 HzB2 · 2.74 m 128 HzC3 · 2.68 m 130.81 HzC3 · 2.62 m 138.59 HzC#3 · 2.47 m 146.83 HzD3 · 2.34 m 150 HzD3 · 2.29 m 155.56 HzD#3 · 2.2 m 160 HzD#3 · 2.14 m 164.81 HzE3 · 2.08 m 174 HzF3 · 1.97 m 174.61 HzF3 · 1.96 m 180 HzF#3 · 1.91 m 185 HzF#3 · 1.85 m 196 HzG3 · 1.75 m 200 HzG3 · 1.72 m 207.65 HzG#3 · 1.65 m 220 HzA3 · 1.56 m 233.08 HzA#3 · 1.47 m 240 HzB3 · 1.43 m 246.94 HzB3 · 1.39 m

Midrange (250 Hz–4 kHz)77

250 HzB3 · 1.37 m 256 HzC4 · 1.34 m 261.63 HzC4 · 1.31 m 277.18 HzC#4 · 1.24 m 285 HzC#4 · 1.2 m 293.66 HzD4 · 1.17 m 300 HzD4 · 1.14 m 311.13 HzD#4 · 1.1 m 315 HzD#4 · 1.09 m 329.63 HzE4 · 1.04 m 349.23 HzF4 · 98.2 cm 350 HzF4 · 98 cm 360 HzF#4 · 95.3 cm 369.99 HzF#4 · 92.7 cm 392 HzG4 · 87.5 cm 396 HzG4 · 86.6 cm 400 HzG4 · 85.8 cm 415.3 HzG#4 · 82.6 cm 417 HzG#4 · 82.3 cm 432 HzA4 · 79.4 cm 440 HzA4 · 78 cm 450 HzA4 · 76.2 cm 466.16 HzA#4 · 73.6 cm 493.88 HzB4 · 69.5 cm 500 HzB4 · 68.6 cm 512 HzC5 · 67 cm 523.25 HzC5 · 65.6 cm 528 HzC5 · 65 cm 554.37 HzC#5 · 61.9 cm 587.33 HzD5 · 58.4 cm 600 HzD5 · 57.2 cm 622.25 HzD#5 · 55.1 cm 630 HzD#5 · 54.4 cm 639 HzD#5 · 53.7 cm 659.25 HzE5 · 52 cm 697 HzF5 · 49.2 cm 698.46 HzF5 · 49.1 cm 700 HzF5 · 49 cm 739.99 HzF#5 · 46.4 cm 741 HzF#5 · 46.3 cm 750 HzF#5 · 45.7 cm 770 HzG5 · 44.5 cm 783.99 HzG5 · 43.8 cm 800 HzG5 · 42.9 cm 852 HzG#5 · 40.3 cm 880 HzA5 · 39 cm 900 HzA5 · 38.1 cm 932.33 HzA#5 · 36.8 cm 941 HzA#5 · 36.5 cm 963 HzB5 · 35.6 cm 987.77 HzB5 · 34.7 cm 997 HzB5 · 34.4 cm 1000 HzB5 · 34.3 cm 1024 HzC6 · 33.5 cm 1046.5 HzC6 · 32.8 cm 1108.73 HzC#6 · 30.9 cm 1174.66 HzD6 · 29.2 cm 1209 HzD6 · 28.4 cm 1250 HzD#6 · 27.4 cm 1318.51 HzE6 · 26 cm 1336 HzE6 · 25.7 cm 1477 HzF#6 · 23.2 cm 1500 HzF#6 · 22.9 cm 1567.98 HzG6 · 21.9 cm 1600 HzG6 · 21.4 cm 1633 HzG#6 · 21 cm 1760 HzA6 · 19.5 cm 1800 HzA6 · 19.1 cm 1975.53 HzB6 · 17.4 cm 2000 HzB6 · 17.2 cm 2093 HzC7 · 16.4 cm 2500 HzD#7 · 13.7 cm 2637.02 HzE7 · 13 cm 3000 HzF#7 · 11.4 cm 3150 HzG7 · 10.9 cm 3500 HzA7 · 9.8 cm 3520 HzA7 · 9.7 cm

Ultrasound (above 20 kHz)14

21000 HzE10 · 1.6 cm 22000 HzF10 · 1.6 cm 22050 HzF10 · 1.6 cm 24000 HzF#10 · 1.4 cm 25000 HzG10 · 1.4 cm 28000 HzA10 · 1.2 cm 30000 HzA#10 · 1.1 cm 32000 HzB10 · 1.1 cm 40000 HzD#11 · 8.6 mm 45000 HzF11 · 7.6 mm 50000 HzG11 · 6.9 mm 60000 HzA#11 · 5.7 mm 80000 HzD#12 · 4.3 mm 100000 HzG12 · 3.4 mm

How to read this

Hertz counts how many times the air vibrates per second. The bigger the number, the higher the pitch.
Wavelength is the speed of sound (343 m/s at 20 °C) divided by the frequency. That makes 20 Hz seventeen metres long and 20 kHz under two centimetres.
People hear roughly 20 Hz to 20 kHz, but the upper limit drops with age. Past about 15 kHz, some hear the tone and some do not.
Hearing nothing does not mean the equipment is broken. Small speakers cannot reach the low notes, and for the high ones it is the ear that gives up first.

Frequently asked questions

QWhat frequencies can people hear?

Roughly 20 Hz to 20 kHz. The upper limit falls with age, though: someone who heard 18 kHz at twenty often stops around 14 kHz by forty. At the bottom end, 20 Hz is felt in the body more than heard.

QI hear nothing — are my speakers broken?

Probably not. The small speakers in a laptop or phone barely produce anything below 100 Hz, and above 15 kHz it is your ears, not the hardware, that run out first. Trying headphones usually settles which it is.

QIs it safe to listen to a pure tone for a while?

Keep the volume low and the sessions short. A pure tone concentrates all its energy at one frequency, so it strains the ear more than music at the same level. If your ears feel dull or ring afterwards, stop.

QWhat is the difference between 440 Hz and 432 Hz?

Both are an A, but 432 Hz sits 32 cents below 440 Hz — about a third of a semitone, clearly audible side by side. The international standard is 440 Hz; claims that 432 Hz is somehow better have no evidence behind them.

QHow are these numbers worked out?

Only the frequency itself is stored. Wavelength is the speed of sound in 20 °C air, 343 m/s, divided by the frequency; the note name comes from taking 440 Hz as A4 and the fact that one semitone is the twelfth root of two.