Knot to Millimeter/Second Converter

Speed Converter

18 units available

Decimals:

From

To

514.444444

1 kn = 514.444444 mm/s

Formula:

mm/s = kn × 514.444444

With your value: 1 kn = 514.444444 mm/s

How big is that?

Everyday references on a logarithmic scale, all expressed in knot so you can sanity-check the result.

Your value1.00 kn

Walking pace (2.7× your value)2.72 kn

Cycling (11× your value)10.7 kn

Urban speed limit (50 km/h) (27× your value)27.0 kn

Cheetah sprint (56× your value)56.4 kn

Motorway (110 km/h) (59× your value)59.5 kn

Other Knot to Millimeter/Second conversions

2 kn to mm/s 3 kn to mm/s 4 kn to mm/s 5 kn to mm/s 6 kn to mm/s 7 kn to mm/s 8 kn to mm/s

Knot to Millimeter/Second Conversion Table

Knot (kn)	Millimeter/Second (mm/s)
0.5	257.222222
1	514.444444
2	1,028.888888
5	2,572.22222
10	5,144.44444
15	7,716.66666
20	10,288.88888
25	12,861.1111
50	25,722.2222
100	51,444.4444
250	128,611.111
500	257,222.222
1000	514,444.444

Millimeter/Second to Knot Conversion Table

Millimeter/Second (mm/s)	Knot (kn)
0.5	0.000972
1	0.001944
2	0.003888
5	0.009719
10	0.019438
15	0.029158
20	0.038877
25	0.048596
50	0.097192
100	0.194384
250	0.485961
500	0.971922
1000	1.943844

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Knot (kn)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Millimeter/Second (mm/s)

Speed

Exact conversion

Derived quantity: a defined length divided by a defined time interval.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Knot to Millimeter/Second

To convert from Knot (kn) to Millimeter/Second (mm/s), multiply the value by 514.444444.

Formula: mm/s = kn × 514.444444

Reverse: kn = mm/s × 0.0019438445

Step-by-Step Example

Start with your value in Knot. For example: 5 kn
Multiply by the conversion factor: 5 x 514.444444
The result is: 2,572.22222 mm/s

About Knot

The knot equals one nautical mile per hour and is used in maritime and aviation contexts.

Fun Fact: The knot gets its name from the practice of using a knotted rope to measure ship speed.

Common uses: navigation, aviation, sailing.

About Millimeter/Second

The millimeter/second (mm/s) is a unit of speed and velocity. One millimeter/second equals 0.001 metre per seconds. UnitConvertLab converts it against every other speed unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: speed calculations, engineering and science, education.

Frequently Asked Questions

How many Millimeter/Second are in 1 Knot?

There are exactly 514.444444 Millimeter/Second in 1 Knot. This means the conversion factor from Knot to Millimeter/Second is 514.444444.

What is the formula to convert Knot to Millimeter/Second?

The formula to convert Knot to Millimeter/Second is: mm/s = kn × 514.444444. For example, to convert 10 Knot to Millimeter/Second, you would multiply 10 by 514.444444.

What is a Knot?