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Kilometers per Hour to Mach Converter

Convert kilometers per hour (km/h) to Mach (at 343 m/s) (Mach), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter a speed, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.000809847748623 Mach
knots
0.539956803456 kn
speed of light
9.26566931106 × 10⁻¹⁰ c
miles per hour
0.621371192237 mph
feet per second
0.911344415281 ft/s
kilometers per second
0.000277777777778 km/s
meters per second
0.277777777778 m/s
centimeters per second
27.7777777778 cm/s

1 km/h = 0.000809847748623 Mach

Show the working
  1. 1 km/h = 0.000809847748623 Mach
  2. 1 × 0.000809847748623 = 0.000809847748623 Mach

How to convert kilometers per hour to mach

1 km/h = 0.000809847748623 Mach, so multiply by 0.000809847748623 to go from kilometers per hour to Mach (at 343 m/s). Going the other way, 1 Mach = 1,234.8 km/h.

Mach = km/h × 0.000809847748623
km/h = Mach × 1,234.8

Worked example:

1 km/h = 0.000809847748623 Mach
5 × 0.000809847748623 = 0.00404923874312 Mach

Kilometers per Hour to mach table

Kilometers per HourMach
1 km/h0.000809847748623 Mach
2 km/h0.00161969549725 Mach
3 km/h0.00242954324587 Mach
4 km/h0.00323939099449 Mach
5 km/h0.00404923874312 Mach
6 km/h0.00485908649174 Mach
7 km/h0.00566893424036 Mach
8 km/h0.00647878198899 Mach
9 km/h0.00728862973761 Mach
10 km/h0.00809847748623 Mach
15 km/h0.0121477162293 Mach
20 km/h0.0161969549725 Mach
25 km/h0.0202461937156 Mach
30 km/h0.0242954324587 Mach
40 km/h0.0323939099449 Mach
50 km/h0.0404923874312 Mach
75 km/h0.0607385811467 Mach
100 km/h0.0809847748623 Mach
250 km/h0.202461937156 Mach
500 km/h0.404923874312 Mach
1000 km/h0.809847748623 Mach

About the units

Kilometers per Hour (km/h)
Kilometers per hour, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
Mach (Mach)
Mach (at 343 m/s), a specialised unit. Mach 1 is the local speed of sound, which depends on air temperature; this converter uses 343 m/s (dry air at 20 °C). In the standard sea-level atmosphere (15 °C) it is 340.3 m/s. Definition: Speed of sound in dry air at 20 °C: 343 m/s (NASA Glenn Research Center).

Formula version 0.1.0Reviewed