Convert Kilometers Per Second to Mach

Enter the speed in kilometers per second below to get the value converted to Mach.

Results in Mach:
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1 km/s = Mach 2.915452

How to Convert Kilometers Per Second to Mach

Speedometers are used in vehicles to measure speed

To convert a kilometer per second measurement to a Mach measurement, multiply the speed by the conversion ratio. One kilometer per second is equal to Mach 2.915452, so use this simple formula to convert:

Mach number = kilometers per second × 2.915452

The Mach number is equal to the speed in kilometers per second multiplied by 2.915452.

For example, here's how to convert 5 kilometers per second to Mach using the formula above.
5 km/s = (5 × 2.915452) = Mach 14.577259

Kilometers per second and Mach are both units used to measure speed. Keep reading to learn more about each unit of measure.

Kilometers Per Second

Kilometers per second are a measurement of speed expressing the distance travelled in kilometers in one second.

The kilometer per second, or kilometre per second, is an SI unit of speed in the metric system. Kilometers per second can be abbreviated as km/s, and are also sometimes abbreviated as km/sec. For example, 1 kilometer per second can be written as 1 km/s or 1 km/sec.

Kilometers per second can be expressed using the formula:
vkm/s = dkmtsec

The velocity in kilometers per second is equal to the distance in kilometers divided by time in seconds.


Mach, sometimes also referred to as a Mach number, is the ratio of the speed of an object to the speed of sound.

Mach can be abbreviated as M, and is also sometimes abbreviated as Ma. For example, Mach 1 can be written as 1 M or 1 Ma.

Although Mach can be abbreviated M or Ma, the Mach number is typically expressed with the number after the unit name. For example, the expression Mach 3 is preferred rather than 3 Machs or 3 M.

The speed is classified as either subsonic, transonic, supersonic, or hypersonic depending on the Mach number.

Speed classifications for various mach numbers.
Speed Classification Mach Number
Subsonic Mach < 1.0
Transonic Mach = 1.0
Supersonic Mach > 1.0
Hypersonic Mach > 5.0

Kilometer Per Second Measurements and Equivalent Mach Conversions

Common kilometer per second values converted to the equivalent Mach value
Kilometers Per Second Mach
1 km/s Mach 2.9155
2 km/s Mach 5.8309
3 km/s Mach 8.7464
4 km/s Mach 11.66
5 km/s Mach 14.58
6 km/s Mach 17.49
7 km/s Mach 20.41
8 km/s Mach 23.32
9 km/s Mach 26.24
10 km/s Mach 29.15
11 km/s Mach 32.07
12 km/s Mach 34.99
13 km/s Mach 37.9
14 km/s Mach 40.82
15 km/s Mach 43.73
16 km/s Mach 46.65
17 km/s Mach 49.56
18 km/s Mach 52.48
19 km/s Mach 55.39
20 km/s Mach 58.31
21 km/s Mach 61.22
22 km/s Mach 64.14
23 km/s Mach 67.06
24 km/s Mach 69.97
25 km/s Mach 72.89
26 km/s Mach 75.8
27 km/s Mach 78.72
28 km/s Mach 81.63
29 km/s Mach 84.55
30 km/s Mach 87.46
31 km/s Mach 90.38
32 km/s Mach 93.29
33 km/s Mach 96.21
34 km/s Mach 99.13
35 km/s Mach 102.04
36 km/s Mach 104.96
37 km/s Mach 107.87
38 km/s Mach 110.79
39 km/s Mach 113.7
40 km/s Mach 116.62

More Kilometer Per Second Speed Conversions

Convert to Knots
1 km/s is equal to 1,943.84 knots
Convert to Speed Of Sound
1 km/s is equal to 2.915452 speed of sound
Convert to Speed Of Light
1 km/s is equal to 3.3356E-6 speed of light
Convert to Miles Per Hour
1 km/s is equal to 2,236.94 miles per hour
Convert to Feet Per Second
1 km/s is equal to 3,280.84 feet per second
Convert to Kilometers Per Hour
1 km/s is equal to 3,600 kilometers per hour
Convert to Meters Per Second
1 km/s is equal to 1,000 meters per second
Convert to Centimeters Per Second
1 km/s is equal to 100,000 centimeters per second