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Kilometers per Second to Mach Converter

Convert kilometers per second (km/s) 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
2.91545189504 Mach
knots
1,943.84449244 kn
speed of light
3.33564095198 × 10⁻⁶ c
miles per hour
2,236.93629205 mph
feet per second
3,280.83989501 ft/s
kilometers per hour
3,600 km/h
meters per second
1,000 m/s
centimeters per second
100,000 cm/s

1 km/s = 2.91545189504 Mach

Show the working
  1. 1 km/s = 2.91545189504 Mach
  2. 1 × 2.91545189504 = 2.91545189504 Mach

How to convert kilometers per second to mach

1 km/s = 2.91545189504 Mach, so multiply by 2.91545189504 to go from kilometers per second to Mach (at 343 m/s). Going the other way, 1 Mach = 0.343 km/s.

Mach = km/s × 2.91545189504
km/s = Mach × 0.343

Worked example:

1 km/s = 2.91545189504 Mach
5 × 2.91545189504 = 14.5772594752 Mach

Kilometers per Second to mach table

Kilometers per SecondMach
1 km/s2.91545189504 Mach
2 km/s5.83090379009 Mach
3 km/s8.74635568513 Mach
4 km/s11.6618075802 Mach
5 km/s14.5772594752 Mach
6 km/s17.4927113703 Mach
7 km/s20.4081632653 Mach
8 km/s23.3236151603 Mach
9 km/s26.2390670554 Mach
10 km/s29.1545189504 Mach
15 km/s43.7317784257 Mach
20 km/s58.3090379009 Mach
25 km/s72.8862973761 Mach
30 km/s87.4635568513 Mach
40 km/s116.618075802 Mach
50 km/s145.772594752 Mach
75 km/s218.658892128 Mach
100 km/s291.545189504 Mach
250 km/s728.862973761 Mach
500 km/s1,457.72594752 Mach
1000 km/s2,915.45189504 Mach

About the units

Kilometers per Second (km/s)
Kilometers per second, 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