Knots to Mach (kn to Ma) Converter

How to convert knots to Mach

FormulaMa = kn × 0.001511782434

Multiply the value in knots by 0.001511782434. To go the other way, multiply by 661.4708423 (or divide by 0.001511782434).

A knot is smaller than a Mach: it takes 661.4708423 knots to make one Mach.

Worked examples

1 knot1 kn × 0.001511782434 = 0.001511782434 Ma
5 knots5 kn × 0.001511782434 = 0.00755891217 Ma
10 knots10 kn × 0.001511782434 = 0.01511782434 Ma
20 knots20 kn × 0.001511782434 = 0.03023564868 Ma
100 knots100 kn × 0.001511782434 = 0.1511782434 Ma

Knots to Mach conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Knots to Mach: 0.1–10 kn
Knots (kn)	Mach (Ma)
0.1 kn	0.00015117824 Ma
0.25 kn	0.00037794561 Ma
0.5 kn	0.00075589122 Ma
1 kn	0.0015117824 Ma
2 kn	0.0030235649 Ma
3 kn	0.0045353473 Ma
4 kn	0.0060471297 Ma
5 kn	0.0075589122 Ma
6 kn	0.0090706946 Ma
7 kn	0.010582477 Ma
8 kn	0.012094259 Ma
9 kn	0.013606042 Ma
10 kn	0.015117824 Ma

Knots to Mach: 12–1,000 kn
Knots (kn)	Mach (Ma)
12 kn	0.018141389 Ma
15 kn	0.022676737 Ma
20 kn	0.030235649 Ma
25 kn	0.037794561 Ma
30 kn	0.045353473 Ma
40 kn	0.060471297 Ma
50 kn	0.075589122 Ma
75 kn	0.11338368 Ma
100 kn	0.15117824 Ma
250 kn	0.37794561 Ma
500 kn	0.75589122 Ma
1,000 kn	1.5117824 Ma

About the units

Knot (kn)

One nautical mile per hour (about 1.15 mph). The standard speed unit for ships, aircraft and wind reports. One knot equals 0.5144444444 meters per second (m/s).

Mach (Ma)

The speed of sound depends on air temperature. This converter uses the International Standard Atmosphere value at sea level, 15 °C: about 340.29 m/s (1,225 km/h, 761 mph). Mach depends on air temperature; this uses the ISA sea-level speed of sound, 340.29 m/s (15 °C).

Frequently asked questions

How many Mach are in one knot?

There are 0.001511782434 Mach in one knot.

How do I convert knots to Mach?

Multiply the number of knots by 0.001511782434. For example, 10 kn × 0.001511782434 = 0.01511782434 Ma.

How many knots are in one Mach?

One Mach equals 661.4708423 knots. That is the reverse factor, 1 ÷ 0.001511782434.

What is 10 knots in Mach?

10 kn = 0.01511782434 Ma.

Is this kn to Ma converter accurate?

The conversion uses the accepted reference value (Mach depends on air temperature; this uses the ISA sea-level speed of sound, 340.29 m/s (15 °C).). Results are shown to 12 significant figures by default; adjust precision in the converter.

Knots to Mach Converter