# Speed of Sound Conversion Calculator

Enter a value in speed of sound below to convert to another unit of speed.

## What Is the Speed of Sound?

The speed of sound is a unit used to measure speed.

Speed of sound can be abbreviated as sound; for example, 1 speed of sound can be written as 1 sound.

## How Fast Is the Speed of Sound?

The speed of sound is the distance a sound wave travels through an elastic medium. The speed of sound through air at 20 °C is equal to 343 meters per second,[1] or roughly 767 miles per hour.

## How to Convert the Speed of Sound

To convert speed of sound to another unit of speed, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.[2]

You can find the conversion factors for speed of sound in the conversion table below.

Then, multiply the speed measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

speed of sound × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

## Speed of Sound Conversion Table

Common speed of sound values and equivalent imperial and metric speed measurements
speed of sound knots Mach number speed of light miles per hour feet per second kilometers per second kilometers per hour meters per second centimeters per second
1 sound 666.738661 kn Mach 1 0.0000011441 c 767.269148 mph 1,125 ft/s 0.343 km/s 1,235 km/h 343 m/s 34,300 cm/s
2 sound 1,333 kn Mach 2 0.0000022882 c 1,535 mph 2,251 ft/s 0.686 km/s 2,470 km/h 686 m/s 68,600 cm/s
3 sound 2,000 kn Mach 3 0.0000034324 c 2,302 mph 3,376 ft/s 1.029 km/s 3,704 km/h 1,029 m/s 102,900 cm/s
4 sound 2,667 kn Mach 4 0.0000045765 c 3,069 mph 4,501 ft/s 1.372 km/s 4,939 km/h 1,372 m/s 137,200 cm/s
5 sound 3,334 kn Mach 5 0.0000057206 c 3,836 mph 5,627 ft/s 1.715 km/s 6,174 km/h 1,715 m/s 171,500 cm/s
6 sound 4,000 kn Mach 6 0.0000068647 c 4,604 mph 6,752 ft/s 2.058 km/s 7,409 km/h 2,058 m/s 205,800 cm/s
7 sound 4,667 kn Mach 7 0.0000080089 c 5,371 mph 7,877 ft/s 2.401 km/s 8,644 km/h 2,401 m/s 240,100 cm/s
8 sound 5,334 kn Mach 8 0.000009153 c 6,138 mph 9,003 ft/s 2.744 km/s 9,878 km/h 2,744 m/s 274,400 cm/s
9 sound 6,001 kn Mach 9 0.000010297 c 6,905 mph 10,128 ft/s 3.087 km/s 11,113 km/h 3,087 m/s 308,700 cm/s
10 sound 6,667 kn Mach 10 0.000011441 c 7,673 mph 11,253 ft/s 3.43 km/s 12,348 km/h 3,430 m/s 343,000 cm/s
11 sound 7,334 kn Mach 11 0.000012585 c 8,440 mph 12,379 ft/s 3.773 km/s 13,583 km/h 3,773 m/s 377,300 cm/s
12 sound 8,001 kn Mach 12 0.000013729 c 9,207 mph 13,504 ft/s 4.116 km/s 14,818 km/h 4,116 m/s 411,600 cm/s
13 sound 8,668 kn Mach 13 0.000014874 c 9,974 mph 14,629 ft/s 4.459 km/s 16,052 km/h 4,459 m/s 445,900 cm/s
14 sound 9,334 kn Mach 14 0.000016018 c 10,742 mph 15,755 ft/s 4.802 km/s 17,287 km/h 4,802 m/s 480,200 cm/s
15 sound 10,001 kn Mach 15 0.000017162 c 11,509 mph 16,880 ft/s 5.145 km/s 18,522 km/h 5,145 m/s 514,500 cm/s
16 sound 10,668 kn Mach 16 0.000018306 c 12,276 mph 18,005 ft/s 5.488 km/s 19,757 km/h 5,488 m/s 548,800 cm/s
17 sound 11,335 kn Mach 17 0.00001945 c 13,044 mph 19,131 ft/s 5.831 km/s 20,992 km/h 5,831 m/s 583,100 cm/s
18 sound 12,001 kn Mach 18 0.000020594 c 13,811 mph 20,256 ft/s 6.174 km/s 22,226 km/h 6,174 m/s 617,400 cm/s
19 sound 12,668 kn Mach 19 0.000021738 c 14,578 mph 21,381 ft/s 6.517 km/s 23,461 km/h 6,517 m/s 651,700 cm/s
20 sound 13,335 kn Mach 20 0.000022882 c 15,345 mph 22,507 ft/s 6.86 km/s 24,696 km/h 6,860 m/s 686,000 cm/s

## Speed of Sound Conversion Calculators

You can also convert speed using one of our speed of sound converters below.

## References

1. CK-12, Speed of Sound, https://www.ck12.org/physics/speed-of-sound/lesson/Speed-of-Sound-MS-PS/
2. National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion