Convert Kilometers Per Hour to Mach Number

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

Results in Mach Number:
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1 km/h = Mach 0.00081

How to Convert Kilometers Per Hour to Mach Number

conversion scale showing kilometers per hour and equivalent Mach number speed values

To convert a kilometer per hour measurement to a Mach measurement, multiply the speed by the conversion ratio. One kilometer per hour is equal to Mach 0.00081, so use this simple formula to convert:

Mach number = kilometers per hour × 0.00081

The Mach number is equal to the speed in kilometers per hour multiplied by 0.00081.

For example, here's how to convert 5 kilometers per hour to Mach number using the formula above.
5 km/h = (5 × 0.00081) = Mach 0.004049

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

Kilometers Per Hour

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

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

Kilometers per hour can be expressed using the formula:
vkm/s = dkmthr

The velocity in kilometers per hour is equal to the distance in kilometers divided by time in hours.

Mach Number

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 Hour Measurements and Equivalent Mach Conversions

Common kilometer per hour values converted to the equivalent Mach value
Kilometers Per Hour Mach Number
1 km/h Mach 0.00081
2 km/h Mach 0.00162
3 km/h Mach 0.00243
4 km/h Mach 0.003239
5 km/h Mach 0.004049
6 km/h Mach 0.004859
7 km/h Mach 0.005669
8 km/h Mach 0.006479
9 km/h Mach 0.007289
10 km/h Mach 0.008098
11 km/h Mach 0.008908
12 km/h Mach 0.009718
13 km/h Mach 0.010528
14 km/h Mach 0.011338
15 km/h Mach 0.012148
16 km/h Mach 0.012958
17 km/h Mach 0.013767
18 km/h Mach 0.014577
19 km/h Mach 0.015387
20 km/h Mach 0.016197
21 km/h Mach 0.017007
22 km/h Mach 0.017817
23 km/h Mach 0.018626
24 km/h Mach 0.019436
25 km/h Mach 0.020246
26 km/h Mach 0.021056
27 km/h Mach 0.021866
28 km/h Mach 0.022676
29 km/h Mach 0.023486
30 km/h Mach 0.024295
31 km/h Mach 0.025105
32 km/h Mach 0.025915
33 km/h Mach 0.026725
34 km/h Mach 0.027535
35 km/h Mach 0.028345
36 km/h Mach 0.029155
37 km/h Mach 0.029964
38 km/h Mach 0.030774
39 km/h Mach 0.031584
40 km/h Mach 0.032394

More Kilometer Per Hour Speed Conversions

Convert to Knots
1 km/h is equal to 0.539957 knots
Convert to Speed Of Sound
1 km/h is equal to 0.00081 speed of sound
Convert to Speed Of Light
1 km/h is equal to 9.2657E-10 speed of light
Convert to Miles Per Hour
1 km/h is equal to 0.621371 miles per hour
Convert to Feet Per Second
1 km/h is equal to 0.911344 feet per second
Convert to Kilometers Per Second
1 km/h is equal to 0.000278 kilometers per second
Convert to Meters Per Second
1 km/h is equal to 0.277778 meters per second
Convert to Centimeters Per Second
1 km/h is equal to 27.777778 centimeters per second